15 research outputs found
Highly Water Repellent but Highly Adhesive Surface with Segregation of Poly(ethylene oxide) Side Chains
Polymer
surfaces were modified using methacrylate terpolymers containing
both perfluoroalkyl (R<sub><i>f</i></sub>) groups and poly(ethylene
oxide) (PEO) as side chains in the same molecule. The structure and
properties of the modified surfaces were evaluated using X-ray photoelectron
spectroscopy and by measuring the dynamic contact angles and 90°
peel strength. It was found that not only R<sub><i>f</i></sub> groups but also PEO side chains were segregated on the surface
being against the order of the surface free energy. The terpolymer
modified surface is hydrophobic in air because R<sub><i>f</i></sub> groups are predominant, but it becomes hydrophilic in water
because the surface is covered with PEO side chains. This response
to the environment is rapid and reversible. The modified surface showed
high water repellency because of the surface R<sub><i>f</i></sub> groups and high adhesive strength because of the side chains
A new genus and a new species of Schizomyiina (Diptera: Cecidomyiidae: Asphondyliini) inducing petiole galls on Macaranga bancana (Miq.) in Borneo, Malaysia
Elsayed, Ayman Khamis, Shimizu-Kaya, Usun, Itioka, Takao, Meleng, Paulus, Yukawa, Junichi, Tokuda, Makoto (2018): A new genus and a new species of Schizomyiina (Diptera: Cecidomyiidae: Asphondyliini) inducing petiole galls on Macaranga bancana (Miq.) in Borneo, Malaysia. Zootaxa 4482 (1): 188-196, DOI: https://doi.org/10.11646/zootaxa.4482.1.1
Correction: Surface-functionalization of isotactic polypropylene via dip-coating with a methacrylate-based terpolymer containing perfluoroalkyl groups and poly(ethylene glycol)
Surfactant-Induced Polymer Segregation To Produce Antifouling Surfaces via Dip-Coating with an Amphiphilic Polymer
We
propose a rational strategy to control the surface segregation
of an amphiphilic copolymer in its dip-coating with a low-molecular-weight
surfactant. We synthesized a water-insoluble methacrylate-based copolymer
containing oligo(ethylene glycol) (OEG) (copolymer <b>1</b>)
and a perfluoroalkylated surfactant (surfactant <b>1</b>) containing
OEG. The dip-coating of copolymer <b>1</b> with surfactant <b>1</b> resulted in the segregation of surfactant <b>1</b> on the top surface of the dip-coated layer due to the high hydrophobicity
of its perfluoroalkyl group. OEG moieties of surfactant <b>1</b> were accompanied by those of copolymer <b>1</b> in its segregation,
allowing the OEG moieties of copolymer <b>1</b> to be located
just below the top surface of the dip-coated layer. The removal of
surfactant <b>1</b> produced the surface covered by the OEG
moieties of the copolymer that exhibited antifouling properties. Using
this strategy, we also succeeded in the introduction of carboxy groups
on the dip-coated surface and demonstrated that the carboxy groups
were available for the immobilization of functional molecules on the
surface