Kinetics of gelation was experimentally and theoretically studied for different polymerization systems leading to the formation of pH/temperature-sensitive hydrogels. Acrylamide (AAm), N-isopropylacrylamide (NIPA), N,Ndimethylacrylamide
(DMA), acrylic acid (AA), methacrylic acid (MAA) were used as main monomers, and N,N’- methylenebisacrylamide (MBAm) as crosslinker.Financial support by Fundação para a Ciência e a Tecnologia (FCT), Ministry of Science and Technology of Portugal (Program COMPETE - QCA III) and European Community through FEDER is gratefully acknowledged
(project PTDC/EQU-EQU/098150/2008)

Costa, Mário Rui

Dias, Rolando

Gonçalves, Miguel A.D.

Pinto, Virgínia

Virgínia Pinto

Miguel Gonçalves

Rolando Dias

Mário Rui P. F. Nunes Da Costa

Open Repository of the University of Porto

KINETICS OF GELATION IN pH/TEMPERATURE-SENSITIVE HYDROGELS 
SYNTHESIS 
 
Virgínia Pinto1, Miguel Gonçalves1, Rolando Dias1 and Mário Rui Costa2 
 
1LSRE - Polytechnic Institute of Bragança, Campus de Santa Apolónia 
Apartado 1134, 5301-857 Bragança,  Portugal 
2LSRE – Fac. Eng. University of Porto, Dep. Eng. Química, R. Roberto Frias 
4200-465 Porto, Portugal 
 
Abstract 
Kinetics of gelation was experimentally and theoretically studied for different polymerization systems leading to the 
formation of pH/temperature-sensitive hydrogels. Acrylamide (AAm), N-isopropylacrylamide (NIPA), N,N-
dimethylacrylamide (DMA), acrylic acid (AA), methacrylic acid (MAA) were used as main monomers, and N,N’- 
methylenebisacrylamide (MBAm) as crosslinker. Stirred batch reactor polymerizations were performed in aqueous 
media using mostly inverse-suspension operation at 200 mL total reaction volume. Sampling was performed along 
the reaction time allowing the study of the dynamics of gel formation. Classical free radical polymerization (FRP), 
with initiation by ammonium persulfate (APS), and RAFT polymerization with 2-dodecylthiocarbonothioylthio-2-
methylpropionic acid (DDMAT) were considered. Different parameters were changed along the experimental 
program, namely the kind and initial concentrations of the different monomers involved (crosslinking 
copolymerizations and terpolymerizations were considered) and the initial molar ratio initiator/DDMAT/monomer. 
Intermediate and final products were characterized by size exclusion chromatography, running directly with aqueous 
eluent, with simultaneous detection of refractive index and multi-angle laser light scattering (SEC/RI/MALLS). 
Kinetics of monomer consumption and molecular architecture of the soluble phase were thus measured. Kinetics of 
polymerization was also investigated through in-line FTIR-ATR. Sensitivity of the hydrogels synthesized to pH, 
temperature and pH/temperature changes was also experimentally assessed. 
 
Kinetic modeling studies on network formation in these different chemical systems were performed in the 
framework of a general kinetic theory for non-linear polymerization.(1)-(4) A polymer reaction engineering approach 
is thus considered in order to develop computational tools linking the synthesis conditions with end-use properties of 
smart hydrogels.    
0.0
0.2
0.4
0.6
0.8
1.0
0 40 80 120 160 200 240
APS/Acrylamide=0.32 % (mol. %)
APS/Acrylamide=0.16 % (mol. %)
M
on
om
er
 C
on
ve
rs
io
n
Time (min)
T= 20 oC
 
(1) 
 
 
0,0
1,0
2,0
3,0
4,0
5,0
6,0
15 20 25 30 35 40
NIPA/MBAm HYDROGEL
DMA/MBAm HYDROGEL
H
yd
ro
ge
l V
ol
um
e 
(c
m
3 )
Temperature (oC)  
(3) 
0,0
0,2
0,4
0,6
0,8
1,0
0 10 20 30 40 50 60 70 80
In-Line FTIR-ATR Measurement
Mon
ome
r Co
nve
rsio
n
Time (min)
T= 20 oC
15% dilution, 80% neutralização, 
0.2% I/M
 
(2) 
 
(1): SEC measured time-evolution of monomer conversion during the inverse-suspension copolymerization of AAm/MBAm at 20 °C with 5% 
monomer dilution in water. Results for two different initial mole ratios APS/AAm are showed. (2): Typical in-line FTIR-ATR spectrum observed 
during the aqueous polymerization of acrylic acid. The bottom figure shows the in-line measured monomer conversion of AA at 20 °C, 15% 
dilution, 80% neutralization and 0.2% APS/AA. (3): Measured temperature-sensitivity of inverse-suspension synthesized NIPA/MBAm and 
DMA/MBAm hydrogels. Both hydrogels were obtained by crosslinking polymerization at 20 °C with 10% monomer dilution in water. 
 
Acknowledgements 
Financial support by Fundação para a Ciência e a Tecnologia (FCT), Ministry of Science and Technology of 
Portugal (Program COMPETE - QCA III) and European Community through FEDER is gratefully acknowledged 
(project PTDC/EQU-EQU/098150/2008). 
 
References 
(1) Costa, M.R.P.F.N.; Dias, R.C.S. Chem. Eng. Sci. 2005, 60, 423. 
(2) Dias, R.C.S.; Costa, M.R.P.F.N.  Polymer 2006, 47, 6895. 
(3) Costa, M.R.P.F.N.; Dias, R.C.S.  Polymer 2007, 48, 1785. 
(4) Gonçalves, M.A.D.; Pinto, V.D.; Dias, R.C.S.; Costa, M.R.P.F.N. Macromol. Symp. 2011, 306-307, 107.] 
Polymer Networks Group 2012 :: Welcome
 
 
Menu
Welcome
Plenary Lectures
Keynote Lectures
Technical Program
Short Course
Registration
Paper Submission
Accommodations
Activities
Contact
About PNG
Welcome 
The Polymer Networks Group would like to welcome you to participate in the 
Polymer Networks 2012 Conference. This meeting will encompass a wide range of 
topics, including but not limited to Biomaterials, Reversible Networks, Fundamental 
Formation-Structure-Property Relationships, Composite Networks, Smart and 
Responsive Networks, and Novel Network Formation Strategies and Reactions. 
The 2012 Conference will be held in scenic Jackson Hole, Wyoming, USA at the Snow King Resort. This is just a 15 
minute shuttle ride from the Airport, which has a range of non-stop flights from most major U.S. airports. Jackson Hole is 
just south of the Teton and Yellowstone National Parks and near a 
myriad of shopping, site seeing, and outdoor activities. 
The conference will feature short courses, plenary talks, parallel 
sessions, posters, and extensive activities. 
         
http://www.polymernetworks2012.org/ [22-08-2012 11:02:48]
Polymer Networks Group 
Jackson Hole, WY, August 12 – 16, 2012 
Technical Program 
 
Tuesday, August 14  
Poster Session  I 
4:00 – 5:30 
 
1 Ricardo Acosta Ortiz 
Development of Thiol-Ene/Epoxy-Amine Photocurable Systems 
2 Alan Aguirre Soto 
Hydrogen Bonded Pseudo Cross-linked Networks from Acrylic-based Monomers: Kinetic Effect 
3 Abeer Alzahrani 
Photo-mediated CuAAC reaction: Capabilities and Applications 
4 Kentaro Taki 
Kinetic Analysis of Photopolymerization of Mono- and Di- functional Methacrylate Group Monomer 
Mixtures using Real Time FT-IR 
5 JianCheng Liu 
Photo-Reactive Nanogel for Tuning Properties during Polymer Network Formation 
6 Detlef Reichert 
Synthesis and Characterization of Well Defined PEG networks by “Click” chemistry 
7 Shunsuke Chatani 
Vinyl Sulfone as a Component of Two-Stage Curing Polymer Systems 
8 Megan Cole 
Synthesis and Characterization of Thiol-Ene Functionalized Siloxanes and Evaluation of their 
Crosslinked Network Properties 
9 Rolando Dias 
Kinetics of Gelation in pH/Temperature-Sensitive Hydrogels Synthesis 
10 Rolando Dias 
Reversible Addition-Fragmentation Chain Transfer Copolymerization of Styrene/Divinylbenzene in 
Aqueous Suspension 
11 Christopher Fenoli 
Advances in RAFT Monomer Development 
12 Tao Gong 
Bulk Photopolymerization Using Photo Induced Copper (I)-Catalyzed Alkyne-Azide Cycloaddition 
(CuAAC) 
13 Weixian Xi 
Nitrogen-centered Nucleophile Catalyzed Thiol Vinylsulfone Addition, another Thiol-ene “Click” 
Reaction 
14 Pelin Yazgan Birgi 
Modıfıcatıon of Polystyrene as a Coating Material vıa Sunflower Fatty Acid  
15 Sophie Bistac 
Emulsion Stabilization by Polymeric Surfactants:  Influence of Nanogels Formation on Colloidal and 
Interfacial Rheological Behaviours 
16 Maurice Brogly 
Nanoscale Adhesion Release Properties of PDMS Networks Investigated by Atomic Force Microscopy 
17 Matthew Barros 
Chain length, Branching, and (Meth)Acrylate Functionality in Polymerization Induced Phase 
Separation 
18 James Goetz 
Network Behavior Investigation of Tunable, Highly Permeable, UV-Cured, Perfluorinated Acrylate 
Modified Thiol-ene Networks 
19 Rouven Henkel 
The Influence of RAFT on the Elastic Properties of UV-initiated Statistical Poly-butyl-acrylate 
Networks 
20 Jongshin Park 
Preparation of Thermoplastic Polyurethanes using Partially Acetylated Lignin 
21 Yoshimi Seida 
QCM Observation of Viscoeleastic Behavior of Collasped Poly(NIPAm) Gel in Response to Protein 
Adsorption 
Polymer Networks Group 
Jackson Hole, WY, August 12 – 16, 2012 
Technical Program 
 
22 Yongsok Seo 
Foaming of Recycled Crosslinked Polyethylenes via Supercritical Decrosslinking Reaction  
23 Caroline Szczepanski 
Design of Low Shrinkage, Heterogeneous Networks via Polymerization-Induced Phase Separation 
24 James Wydra 
Property Development in Photopolymerizations 
25 Bernd Lauke 
Structure Evolution of Carbon Black Networks in Elastomers Under Deformation 
26 Ryan Guterman 
Ultra-High Loading of Phosphonium Cations in UV-Cured Films: Accessing the Surfaces Charges for 
Layer-By-Layer Assembly Applications 
27 Delia Lopez Velazquez 
Networks of Poly(bis-allylcarbonate of Dihydroxybenzaldehyde 
28 Sara Aßhoff 
Stabilizing Photochromic Liquid Crystals with Polymer Networks 
29 Cigdem Tasdelen Yucedag 
Modification of Polystyrene with Polycaprolactone via Click Chemistry 
30 Soon Man Hong 
Recycling of Cross-linked Low Density Polyethylene (LDPE) Using Extrusion Process 
31 Sini NK 
Effect of Blending on Thermal Behavior of Cardanol Based bisbenzoxazine Monomers and Bisimides 
 
Polymer Networks Group 
Jackson Hole, WY, August 12 – 16, 2012 
Technical Program 
 
 
Wednesday, August 15  
Poster Session  II 
4:00 – 5:30 
 
1 Ming Gao 
High Resolution Monitoring of Hydrogel Swelling: Enhancing Swelling Kinetics of DNA-polymer 
Hybrid Hydrogel Employing Polyethyleneglycol as a Porogen 
2 Ethan Gillett 
Allyl Sulfide Containing Covalent Adaptable Networks (CANs) Properties and Applications 
3 Takehiko Gotoh 
Repeated Adsorption of Metal Ions onto Thermosensitive Ionic Hydrogel by Temperature Swing 
4 Devatha Nair 
Two-Stage Reactive Polymer Materials Platform 
5 Jing Zhou 
Acoustic Activation of Shape-Memory Materials 
6 Gayla Berg 
2D and 3D Photolithography Using Diels-Alder and Thiol-Ene Click Reactions 
7 Jessalyn Cortese 
Organization in Supramolecular Polymers 
8 Mathieu Capelot 
Vitrimers: Silica-Like Malleable and Weldable Thermosets 
9 Clémence Wable 
Mechanical and Thermodynamic Characterization of Hybrid PDMA Hydrogels 
10 Jennifer Macron 
Reversible Adhesion of Hydrogels in Aqueous Media 
11 Kenneth Koehler 
Diels-Alder Mediated Controlled Release from a PEG Based Hydrogel 
12 Junkal Gutierrez 
Simple-Route to Fabricate Smart Nanopapers Based on Bacterial Cellulose and Different Inorganic 
Nanoparticles 
13 Jennifer Leight 
Characterizing MMP Expression using Modular Fluorescent Peptide Biosensors 
14 Katherine Lewis 
Formation of Model Alveoli In A Tunable Synthetic Scaffold 
15 Vijay Mannari 
UV-curable Polyurethane Dispersions based on Acrylated Soy-polyols: Fine Tuning Network 
Structure, Bio-renewable Content and Performance Properties of Coatings 
16 Emily Matherly 
Thiol-ene Hydrogels Can Maintain Stem Cell Pluripotency in a Precisely Controlled Niche 
17 Dagmara Smith Motriuk 
Araneus Gemmoides Dragline Silk 
18 Helina Pohjanlehto 
Lignin Based Polymer Network Systems: Preparation and Characterization 
19 Kelly Pollock 
Manipulating the Microenvironment to Control Valvular Interstitial Cell Phenotype 
20 Raveesh Shenoy 
3-D Conformal Coatings by Interfacial Radical Polymerization Initiated by a Glucose Oxidase-
Mediated Redox System 
21 Jedrzej Skrobot 
In Vitro Degradation of Photo-Cross-Linked Elastomeric Networks for Soft Tissue Regeneration 
22 
 
Jedrzej Skrobot 
Gamma Radiation Induced Grafting of 1-Vinyl-2-Pyrrolidone (NVP) on Multiblock Polyesters 
23 Bradley Sparks 
Structure-Property Relationships of Dopamine Acrylamide Modified Thiol-Ene Networks 
Polymer Networks Group 
Jackson Hole, WY, August 12 – 16, 2012 
Technical Program 
 
24 Felicia Svedlund 
A Synthetic Polymer-based, Micropatterned Surface for the Culture of Embryonic Stem Cells 
25 Emi Tokuda 
Understanding the Role of the Microenvironment in Melanoma Responses to MEK Inhibition 
26 Kelly Trowbridge 
Acrylate and Thiol-Ene PEG Hydrogels for Islet Encapsulation 
27 Redouan Mahou 
Encapsulation of Cells Within Hybrid Microspheres 
28 Eric Dailing 
Network Modificaiton through Water-Dispersable Nanogels 
29 Steven Lewis 
Synthesis and Polymer Network Development of Water-compatible Nanogels using Conventional 
Hydrophobic and Hydrophilic Monomer Combinations 
30 Hernane Barud 
Bacterial Cellulose/Silk Fibroin Sponge Scaffold 
31 Stevin Gehrke 
Structure-Function Properties of Beetle Elytral Cuticle, a Multicomponent Biomaterial 
 


English

Kinetics of gelation in pH/temperature-sensitive hydrogels synthesis

Repositório Aberto da Universidade do Porto

KINETICS OF GELATION IN pH/TEMPERATURE-SENSITIVE HYDROGELS SYNTHESIS  Virgínia Pinto1, Miguel Gonçalves1, Rolando Dias1 and Mário Rui Costa2  1LSRE - Polytechnic Institute of Bragança, Campus de Santa Apolónia Apartado 1134, 5301-857 Bragança,  Portugal 2LSRE – Fac. Eng. University of Porto, Dep. Eng. Química, R. Roberto Frias 4200-465 Porto, Portugal  Abstract Kinetics of gelation was experimentally and theoretically studied for different polymerization systems leading to the formation of pH/temperature-sensitive hydrogels. Acrylamide (AAm), N-isopropylacrylamide (NIPA), N,N-dimethylacrylamide (DMA), acrylic acid (AA), methacrylic acid (MAA) were used as main monomers, and N,N’- methylenebisacrylamide (MBAm) as crosslinker. Stirred batch reactor polymerizations were performed in aqueous media using mostly inverse-suspension operation at 200 mL total reaction volume. Sampling was performed along the reaction time allowing the study of the dynamics of gel formation. Classical free radical polymerization (FRP), with initiation by ammonium persulfate (APS), and RAFT polymerization with 2-dodecylthiocarbonothioylthio-2-methylpropionic acid (DDMAT) were considered. Different parameters were changed along the experimental program, namely the kind and initial concentrations of the different monomers involved (crosslinking copolymerizations and terpolymerizations were considered) and the initial molar ratio initiator/DDMAT/monomer. Intermediate and final products were characterized by size exclusion chromatography, running directly with aqueous eluent, with simultaneous detection of refractive index and multi-angle laser light scattering (SEC/RI/MALLS). Kinetics of monomer consumption and molecular architecture of the soluble phase were thus measured. Kinetics of polymerization was also investigated through in-line FTIR-ATR. Sensitivity of the hydrogels synthesized to pH, temperature and pH/temperature changes was also experimentally assessed.  Kinetic modeling studies on network formation in these different chemical systems were performed in the framework of a general kinetic theory for non-linear polymerization.(1)-(4) A polymer reaction engineering approach is thus considered in order to develop computational tools linking the synthesis conditions with end-use properties of smart hydrogels.    0.00.20.40.60.81.00 40 80 120 160 200 240APS/Acrylamide=0.32 % (mol. %)APS/Acrylamide=0.16 % (mol. %)Monomer ConversionTime (min)T= 20 oC (1)   0,01,02,03,04,05,06,015 20 25 30 35 40NIPA/MBAm HYDROGELDMA/MBAm HYDROGELHydrogel Volume (cm3 )Temperature (oC)  (3) 0,00,20,40,60,81,00 10 20 30 40 50 60 70 80In-Line FTIR-ATR MeasurementMonomer ConversionTime (min)T= 20 oC15% dilution, 80% neutralização, 0.2% I/M (2)  (1): SEC measured time-evolution of monomer conversion during the inverse-suspension copolymerization of AAm/MBAm at 20 °C with 5% monomer dilution in water. Results for two different initial mole ratios APS/AAm are showed. (2): Typical in-line FTIR-ATR spectrum observed during the aqueous polymerization of acrylic acid. The bottom figure shows the in-line measured monomer conversion of AA at 20 °C, 15% dilution, 80% neutralization and 0.2% APS/AA. (3): Measured temperature-sensitivity of inverse-suspension synthesized NIPA/MBAm and DMA/MBAm hydrogels. Both hydrogels were obtained by crosslinking polymerization at 20 °C with 10% monomer dilution in water.  Acknowledgements Financial support by Fundação para a Ciência e a Tecnologia (FCT), Ministry of Science and Technology of Portugal (Program COMPETE - QCA III) and European Community through FEDER is gratefully acknowledged (project PTDC/EQU-EQU/098150/2008).  References (1) Costa, M.R.P.F.N.; Dias, R.C.S. Chem. Eng. Sci. 2005, 60, 423. (2) Dias, R.C.S.; Costa, M.R.P.F.N.  Polymer 2006, 47, 6895. (3) Costa, M.R.P.F.N.; Dias, R.C.S.  Polymer 2007, 48, 1785. (4) Gonçalves, M.A.D.; Pinto, V.D.; Dias, R.C.S.; Costa, M.R.P.F.N. Macromol. Symp. 2011, 306-307, 107.] Polymer Networks Group 2012 :: Welcome  MenuWelcomePlenary LecturesKeynote LecturesTechnical ProgramShort CourseRegistrationPaper SubmissionAccommodationsActivitiesContactAbout PNGWelcome The Polymer Networks Group would like to welcome you to participate in the Polymer Networks 2012 Conference. This meeting will encompass a wide range of topics, including but not limited to Biomaterials, Reversible Networks, Fundamental Formation-Structure-Property Relationships, Composite Networks, Smart and Responsive Networks, and Novel Network Formation Strategies and Reactions. The 2012 Conference will be held in scenic Jackson Hole, Wyoming, USA at the Snow King Resort. This is just a 15 minute shuttle ride from the Airport, which has a range of non-stop flights from most major U.S. airports. Jackson Hole is just south of the Teton and Yellowstone National Parks and near a myriad of shopping, site seeing, and outdoor activities. The conference will feature short courses, plenary talks, parallel sessions, posters, and extensive activities.          http://www.polymernetworks2012.org/ [22-08-2012 11:02:48]Polymer Networks Group Jackson Hole, WY, August 12 – 16, 2012 Technical Program  Tuesday, August 14  Poster Session  I 4:00 – 5:30  1 Ricardo Acosta Ortiz Development of Thiol-Ene/Epoxy-Amine Photocurable Systems 2 Alan Aguirre Soto Hydrogen Bonded Pseudo Cross-linked Networks from Acrylic-based Monomers: Kinetic Effect 3 Abeer Alzahrani Photo-mediated CuAAC reaction: Capabilities and Applications 4 Kentaro Taki Kinetic Analysis of Photopolymerization of Mono- and Di- functional Methacrylate Group Monomer Mixtures using Real Time FT-IR 5 JianCheng Liu Photo-Reactive Nanogel for Tuning Properties during Polymer Network Formation 6 Detlef Reichert Synthesis and Characterization of Well Defined PEG networks by “Click” chemistry 7 Shunsuke Chatani Vinyl Sulfone as a Component of Two-Stage Curing Polymer Systems 8 Megan Cole Synthesis and Characterization of Thiol-Ene Functionalized Siloxanes and Evaluation of their Crosslinked Network Properties 9 Rolando Dias Kinetics of Gelation in pH/Temperature-Sensitive Hydrogels Synthesis 10 Rolando Dias Reversible Addition-Fragmentation Chain Transfer Copolymerization of Styrene/Divinylbenzene in Aqueous Suspension 11 Christopher Fenoli Advances in RAFT Monomer Development 12 Tao Gong Bulk Photopolymerization Using Photo Induced Copper (I)-Catalyzed Alkyne-Azide Cycloaddition (CuAAC) 13 Weixian Xi Nitrogen-centered Nucleophile Catalyzed Thiol Vinylsulfone Addition, another Thiol-ene “Click” Reaction 14 Pelin Yazgan Birgi Modıfıcatıon of Polystyrene as a Coating Material vıa Sunflower Fatty Acid  15 Sophie Bistac Emulsion Stabilization by Polymeric Surfactants:  Influence of Nanogels Formation on Colloidal and Interfacial Rheological Behaviours 16 Maurice Brogly Nanoscale Adhesion Release Properties of PDMS Networks Investigated by Atomic Force Microscopy 17 Matthew Barros Chain length, Branching, and (Meth)Acrylate Functionality in Polymerization Induced Phase Separation 18 James Goetz Network Behavior Investigation of Tunable, Highly Permeable, UV-Cured, Perfluorinated Acrylate Modified Thiol-ene Networks 19 Rouven Henkel The Influence of RAFT on the Elastic Properties of UV-initiated Statistical Poly-butyl-acrylate Networks 20 Jongshin Park Preparation of Thermoplastic Polyurethanes using Partially Acetylated Lignin 21 Yoshimi Seida QCM Observation of Viscoeleastic Behavior of Collasped Poly(NIPAm) Gel in Response to Protein Adsorption Polymer Networks Group Jackson Hole, WY, August 12 – 16, 2012 Technical Program  22 Yongsok Seo Foaming of Recycled Crosslinked Polyethylenes via Supercritical Decrosslinking Reaction  23 Caroline Szczepanski Design of Low Shrinkage, Heterogeneous Networks via Polymerization-Induced Phase Separation 24 James Wydra Property Development in Photopolymerizations 25 Bernd Lauke Structure Evolution of Carbon Black Networks in Elastomers Under Deformation 26 Ryan Guterman Ultra-High Loading of Phosphonium Cations in UV-Cured Films: Accessing the Surfaces Charges for Layer-By-Layer Assembly Applications 27 Delia Lopez Velazquez Networks of Poly(bis-allylcarbonate of Dihydroxybenzaldehyde 28 Sara Aßhoff Stabilizing Photochromic Liquid Crystals with Polymer Networks 29 Cigdem Tasdelen Yucedag Modification of Polystyrene with Polycaprolactone via Click Chemistry 30 Soon Man Hong Recycling of Cross-linked Low Density Polyethylene (LDPE) Using Extrusion Process 31 Sini NK Effect of Blending on Thermal Behavior of Cardanol Based bisbenzoxazine Monomers and Bisimides  Polymer Networks Group Jackson Hole, WY, August 12 – 16, 2012 Technical Program   Wednesday, August 15  Poster Session  II 4:00 – 5:30  1 Ming Gao High Resolution Monitoring of Hydrogel Swelling: Enhancing Swelling Kinetics of DNA-polymer Hybrid Hydrogel Employing Polyethyleneglycol as a Porogen 2 Ethan Gillett Allyl Sulfide Containing Covalent Adaptable Networks (CANs) Properties and Applications 3 Takehiko Gotoh Repeated Adsorption of Metal Ions onto Thermosensitive Ionic Hydrogel by Temperature Swing 4 Devatha Nair Two-Stage Reactive Polymer Materials Platform 5 Jing Zhou Acoustic Activation of Shape-Memory Materials 6 Gayla Berg 2D and 3D Photolithography Using Diels-Alder and Thiol-Ene Click Reactions 7 Jessalyn Cortese Organization in Supramolecular Polymers 8 Mathieu Capelot Vitrimers: Silica-Like Malleable and Weldable Thermosets 9 Clémence Wable Mechanical and Thermodynamic Characterization of Hybrid PDMA Hydrogels 10 Jennifer Macron Reversible Adhesion of Hydrogels in Aqueous Media 11 Kenneth Koehler Diels-Alder Mediated Controlled Release from a PEG Based Hydrogel 12 Junkal Gutierrez Simple-Route to Fabricate Smart Nanopapers Based on Bacterial Cellulose and Different Inorganic Nanoparticles 13 Jennifer Leight Characterizing MMP Expression using Modular Fluorescent Peptide Biosensors 14 Katherine Lewis Formation of Model Alveoli In A Tunable Synthetic Scaffold 15 Vijay Mannari UV-curable Polyurethane Dispersions based on Acrylated Soy-polyols: Fine Tuning Network Structure, Bio-renewable Content and Performance Properties of Coatings 16 Emily Matherly Thiol-ene Hydrogels Can Maintain Stem Cell Pluripotency in a Precisely Controlled Niche 17 Dagmara Smith Motriuk Araneus Gemmoides Dragline Silk 18 Helina Pohjanlehto Lignin Based Polymer Network Systems: Preparation and Characterization 19 Kelly Pollock Manipulating the Microenvironment to Control Valvular Interstitial Cell Phenotype 20 Raveesh Shenoy 3-D Conformal Coatings by Interfacial Radical Polymerization Initiated by a Glucose Oxidase-Mediated Redox System 21 Jedrzej Skrobot In Vitro Degradation of Photo-Cross-Linked Elastomeric Networks for Soft Tissue Regeneration 22  Jedrzej Skrobot Gamma Radiation Induced Grafting of 1-Vinyl-2-Pyrrolidone (NVP) on Multiblock Polyesters 23 Bradley Sparks Structure-Property Relationships of Dopamine Acrylamide Modified Thiol-Ene Networks Polymer Networks Group Jackson Hole, WY, August 12 – 16, 2012 Technical Program  24 Felicia Svedlund A Synthetic Polymer-based, Micropatterned Surface for the Culture of Embryonic Stem Cells 25 Emi Tokuda Understanding the Role of the Microenvironment in Melanoma Responses to MEK Inhibition 26 Kelly Trowbridge Acrylate and Thiol-Ene PEG Hydrogels for Islet Encapsulation 27 Redouan Mahou Encapsulation of Cells Within Hybrid Microspheres 28 Eric Dailing Network Modificaiton through Water-Dispersable Nanogels 29 Steven Lewis Synthesis and Polymer Network Development of Water-compatible Nanogels using Conventional Hydrophobic and Hydrophilic Monomer Combinations 30 Hernane Barud Bacterial Cellulose/Silk Fibroin Sponge Scaffold 31 Stevin Gehrke Structure-Function Properties of Beetle Elytral Cuticle, a Multicomponent Biomaterial  

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Kinetics of gelation in pH/temperature-sensitive hydrogels synthesis

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