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Synthesis, Characterization, and Properties Evaluation of Poly[( N ‐isopropylacrylamide)‐ co ‐ester]s
Author(s) -
Ren Liqun,
Agarwal Seema
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200600484
Subject(s) - copolymer , polymer chemistry , ketene , reactivity (psychology) , acetal , hydrolysis , poly(n isopropylacrylamide) , ring opening polymerization , polymerization , chemistry , methylene , lower critical solution temperature , materials science , organic chemistry , polymer , medicine , alternative medicine , pathology
Copolymerization behavior of cyclic ketene acetal like 5,6‐benzo‐2‐methylene‐1,3‐dioxepane (BMDO) with N ‐isopropylacrylamide (NIPAAm) is studied by free radical polymerization. Structural characterization is done using 1D and 2D NMR techniques. Under optimized reaction conditions, quantitative ring‐opening of BMDO took place during the copolymerizations leading to the formation of poly(NIPAAm‐ co ‐ester)s. The reactivity ratios for the copolymerization of BMDO and NIPAAm were determined using Kelen–Tüdõs method and found to be r BMDO = 0.11 and r NIPAAm = 7.31. Copolymers with low mol‐% of BMDO were found to be soluble in water and also showed hydrolytic degradability. Different degradable copolymers could be generated with varied glass transition temperatures and lower critical solution temperatures (LCSTs).