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Coatings 2015, 5(4), 758-770; doi:10.3390/coatings5040758

Synthesis of a pH- and Thermo- Responsive Binary Copolymer Poly(N-vinylimidazole-co-N-vinylcaprolactam) Grafted onto Silicone Films

1
Facultad de Ciencias Básicas, Programa de Química, Universidad de la Amazonia, Florencia 180002, Colombia
2
Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, México DF 04510, México
*
Author to whom correspondence should be addressed.
Academic Editor: James Tsoi
Received: 3 October 2015 / Revised: 23 October 2015 / Accepted: 26 October 2015 / Published: 30 October 2015
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Abstract

This work focuses on the effects of gamma-ray irradiation conditions on the stimuli-responsiveness of silicone rubber (SR) substrates grafted with N-vinylcaprolactam (NVCL) and N-vinylimidazole (NVIM), modified by the simultaneously polymerization and grafting method, which is expected to result in valuable new applications in the near future. The modification of silicone rubber was carried out via γ-ray radiation in order to graft a binary copolymer, poly(N-vinylimidazole-co-N-vinylcaprolactam), by the pre-irradiation method, to obtain pH- and thermo-responsive materials. The grafting yield was found to be directly proportional to the dose and monomers concentration. The biomaterials were characterized by using Fourier-transform infrared attenuated total reflection (FTIR-ATR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and swelling; and their stimuli behavior was evaluated by lower critical solution temperature (LCST) and pH critical studies. View Full-Text
Keywords: silicone rubber; poly(N-vinylimidazole); poly(N-vinylcaprolactam); radiation-grafting; LCST; pH critical silicone rubber; poly(N-vinylimidazole); poly(N-vinylcaprolactam); radiation-grafting; LCST; pH critical
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Obando-Mora, Á.; Acevedo-Gutiérrez, C.A.; Pérez-Cinencio, J.G.; Sánchez-Garzón, F.S.; Bucio, E. Synthesis of a pH- and Thermo- Responsive Binary Copolymer Poly(N-vinylimidazole-co-N-vinylcaprolactam) Grafted onto Silicone Films. Coatings 2015, 5, 758-770.

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