Multicarboxylic aromatic acid core initiator for the synthesis of star‐shaped poly(ϵ‐caprolactone) with carboxyl end groups | Zendy

Jia Zhongfan | Zendy; Huang Junlian | Zendy

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Multicarboxylic aromatic acid core initiator for the synthesis of star‐shaped poly(ϵ‐caprolactone) with carboxyl end groups

Author(s) -

Jia Zhongfan,

Huang Junlian

Publication year - 2006

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.23234

Subject(s) - polymer chemistry , ring opening polymerization , polymerization , gel permeation chromatography , caprolactone , end group , nucleophile , chemistry , thermogravimetric analysis , materials science , catalysis , organic chemistry , polymer

We successfully carried out the ring‐opening polymerization of ϵ‐caprolactone with 1,3,5‐benzenetricarboxylic acid and 1,2,4,5‐benzenetetracarboxylic acid as the core initiators at 225°C in bulk, and three‐armed and four‐armed star poly(ϵ‐caprolactone)s [poly(ϵ‐CL)s] with carboxyl end groups were obtained. No transesterification, which would have led to a decrease in the molecular weight of poly(ϵ‐CL), was found. The effects of the polymerization conditions on the polymerization are discussed; the poly(ϵ‐CL)s were characterized by 1 H‐NMR, gel permeation chromatography, and thermogravimetric analysis in detail. A mechanism of alkyl–oxygen bond scission by the nucleophilic attack of the carboxyl anions via hydrogen proton transfer is presented for this system. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3713–3717, 2006

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