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Temperature and pH‐Sensitive Swelling Behavior of Binary DMAEMA/4VP Grafts on Poly(propylene) Films
Author(s) -
Burillo Guillermina,
Bucio Emilio,
Arenas Ever,
Lopez Gabriel P.
Publication year - 2007
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200600394
Subject(s) - lower critical solution temperature , upper critical solution temperature , swelling , materials science , methacrylate , polymer chemistry , polymer , grafting , chemical engineering , composite material , copolymer , engineering
Abstract Poly( N , N ‐dimethylaminoethyl methacrylate) (PDMAEMA) is a polymer or hydrogel that is both thermosensitive and pH sensitive, with a low critical solution temperature (LCST) around 38 °C and a pH critical point of 2.5. Poly(4‐vinylpyridine) (P4VP) shows pH sensitivity with a critical point of 5.1. Grafting of stimuli‐sensitive polymers onto mechanically durable poly(propylene) (PP) substrates was used in this study. We have focused on the influence of temperature and pH on the response of binary graft films produced by gamma irradiation in one and two steps. An LCST‐type hydration transition in the grafts was observed by measuring swelling of the films and water contact angle at different temperatures and pH. An upper critical solution temperature (UCST)‐type behavior was also observed by swelling PP‐ g ‐DMAEMA and DMAEMA/4VP binary grafting onto PP films at pH 2.2.