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Interpenetrating Thermo and pH Stimuli‐Responsive Polymer Networks of PAAc/PNIPAAm Grafted onto PP
Author(s) -
Ruiz JuanCarlos,
Burillo Guillermina,
Bucio Emilio
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.200700178
Subject(s) - lower critical solution temperature , acrylic acid , copolymer , interpenetrating polymer network , materials science , swelling , polymer , polymer chemistry , polymerization , polymer network , poly(n isopropylacrylamide) , chemical engineering , composite material , engineering
A new strategy was used to prepare an interpenetrating polymer network of two stimuli‐responsive polymers, a thermosensitive poly N ‐isopropylacrylamide (PNIPAAm) and a pH sensitive poly(acrylic acid) (PAAc) grafted onto poly(propylene) (PP) films (PP‐ g ‐PAAc). Three consecutive steps were used: graft copolymerization of PAAc onto PP films by gamma radiation, crosslinking of PP‐ g ‐PAAc to form the first network, and synthesis of a second network of PNIPAAm in situ within the crosslinked PP‐ g ‐PAAc by chemical polymerization and crosslinking. The phase transition temperature (LCST), measured by swelling measurements and DSC, the pH critical point, obtained by swelling, and the SEM derived morphology of network samples are reported.