Microcapsules of Poly(methyl metharcylate) Containing Epoxy Resin and Multi-Walled Carbon Nanotubes

32nd International Conference of the Polymer-Processing-Society (PPS) -- JUL 25-29, 2016 -- Lyon, FRANCEIcduygu, Mehmet/0000-0002-2793-6998;WOS: 000426217800018Microcapsules of poly(methyl methacrylate) [PMMA] containing epoxy and multi-walled carbon nanotubes were fanned by solution evaporation in an aqueous emulsion. Thin PMMA shells precipitated at the resin/water interface as the solvent was removed, thus encapsulating the dispersion of epoxy and nanotubes. Dichloromethane (DCM) was selected as the common solvent for both resin and PMMA, and slowly evaporated from the aqueous mixture agitated at 40 degrees C. After trying various epoxy/PMMA ratios, a 1:1 w/w epoxy/PMMA ratio yielded stable, individual microcapsules with smooth PMMA shells. Four different mixing speeds (300, 500, 800, and 1000 rpm) and four carbon nanotube contents (0.25, 0.50, 1.00, 2.00 w/w %) were used during the encapsulation process. Microcapsules with 10 to 55 mu m average diameter were obtained by increasing the mixing speed from 300 to 1000 rpm. Increasing the mixing speed yielded a decrease in average particle size, whereas carbon nanotube presence led to a broader capsule size distribution at any given mixing speed. In addition, rouglmess of the microcapsule surface increased with increasing carbon nanotube content and mixing speed. SEM images of microcapsules showed that microcapsules with various types of core-shell morphology were formed during the encapsulation process.Polymer Proc Soc, Xplore, Anton Paar, TRANSLAVOR, TOTAL, Plastipolis, BOREALIS, SOLVAY, Nexans, Leistritz, HUTCHINSON, Univ EuroMediterraneenne Fes, Inst Carnot, AuvergneRhoneAlpes, GRANDLYON, Univ Lyon Inst Natl Sci Appliquees, ONLYLYON, Ingn Materiaux Polymere

Three-dimensional nano-morphology of carbon nanotube/epoxy filled poly(methyl methacrylate) microcapsules

HAMIDI, Youssef K./0000-0003-3648-9939WOS: 000469757500028PubMed: 31035448The three-dimensional nano-morphology of poly(methyl methacrylate; PMMA) microcapsules filled with carbon nanotubes (CNTs) and epoxy resin were investigated by various microscopy methods, including a novel, laser scanning confocal microscopy (LSCM) method. Initially, PMMA microcapsules containing various amounts of CNTs were synthesized by a solvent evaporation method. Scanning electron microscopy analysis showed that pore-free, smooth-surface microcapsules formed with various types of core-shell morphologies. The average size of CNT/epoxy/PMMA microcapsules was shown to decrease from similar to 52 m to similar to 15 m when mixing speed during synthesis increased from 300 rpm to 1000 rpm. In general, the presence of CNTs resulted in slightly larger microcapsules and higher variations in size. Moreover, three-dimensional scans obtained from confocal microscopy revealed that higher CNT content increased the occurrence and size of CNT aggregates inside the microcapsules. Entrapped submicron air bubbles were also observed inside most microcapsules, particularly within those with higher CNT content

Synthesis and styrene copolymerization of novel phenoxy and benzyloxy ring-substituted octyl phenylcyanoacrylates

Novel ring-substituted octyl phenylcyanoacrylates, RPhCH=C(CN)CO2CH2(CH2)6CH3 (where R is 3-phenoxy, 4-phenoxy, 4-(4-bromophenoxy), 3-(4-chlorophenoxy), 2-(4-fluorophenoxy), 3-(4-methylphenoxy), 4-(4-methylphenoxy), 4-(4-nitrophenoxy), 3-[3-(trifluoromethyl)phenoxy], 2-benzyloxy, 3-benzyloxy, 4-benzyloxy) were prepared and copolymerized with styrene. The acrylates were synthesized by the piperidine catalyzed Knoevenagel condensation of ring-substituted benzaldehydes and octyl cyanoacetate, and characterized by CHN analysis, IR, 1H and 13C NMR. The acrylates were copolymerized with styrene in solution with radical initiation (ABCN) at 70C. The compositions of the copolymers were calculated from nitrogen analysis