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Dual lower critical solution temperature polymer networks based on block, laminate, and interpenetrating network structures composed of N ‐alkylacrylamides and N,N ‐dialkylaminoethyl methacrylates
Author(s) -
Stoltz Michael J.,
Brazel Christopher S.
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12134
Subject(s) - lower critical solution temperature , methacrylate , copolymer , materials science , polymer , polymer chemistry , interpenetrating polymer network , swelling , chemical engineering , composite material , engineering
Novel materials that display two lower critical solution temperatures (LCSTs) were developed by forming block copolymers, laminate structures, and interpenetrating networks of crosslinked polymer systems that displayed temperature sensitivity independently. A number of LCST polymers and copolymers were investigated, including those based on N ‐isopropylacrylamide, N,N ‐diethylacrylamide, N,N ‐diethylaminoethyl methacrylate, and N,N ‐dimethylaminoethyl methacrylate. The polymer structure was found to profoundly influence the thermal sensitivity, as polymer formulation techniques led to materials with varying degrees of temperature sensitivity. Random and block copolymerization, along with interpenetrating networks and laminate systems, were studied, with only the structures having the greatest physical separation between pendent chains of different types having the ability to separate temperature transitions. Experiments were conducted to characterize the equilibrium swelling behavior and thermal transitions in the polymer systems. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2974–2981, 2003