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

✍ Scribed by Liqun Ren; Seema Agarwal

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 250 KB
• Volume: 208
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200600484

✦ Synopsis

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 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).

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