Synthesis, Characterization, and Properties Evaluation of Poly[(N-isopropylacrylamide)-co-ester]s

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Ren, Liqun ; Agarwal, Seema:
Synthesis, Characterization, and Properties Evaluation of Poly[(N-isopropylacrylamide)-co-ester]s.
In: Macromolecular Chemistry and Physics. Bd. 208 (2007) Heft 3 . - S. 245-253.
ISSN 1521-3935
DOI: https://doi.org/10.1002/macp.200600484

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Abstract

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 rBMDO = 0.11 and rNIPAAm = 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).