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Synthesis and properties of polyurethane ionomers based on carboxylated polycaprolactone

✍ Scribed by Hong Chen; Dongzhong Chen; Quli Fan; Xuehai Yu


Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
173 KB
Volume
76
Category
Article
ISSN
0021-8995

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✦ Synopsis


Polycaprolactone containing carboxyl groups (CPCL, M n ϭ 1200) was prepared from caprolactone (CL) and dimethylol propionic acid (DMPA). Based on the CPCL, 4,4Ј-diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BD), a novel series of polyurethane ionomers could be synthesized with ions in the soft segment. The tensile modulus and ultimate elongation of the ionomer cast films increased, and the glass transition temperature of the CPCL-rich phase moved to a higher temperature after ionization. Moreover, this kind of ionomers showed small amounts of hard segment crystallinity by DSC. WAXD shows an ionic peak at 2 ϭ 8.6°for the ionomer with carboxylate in the hard segment, which is not present in the ionomer with carboxylate in the soft segment.


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