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Heating characteristics and polymerization of ε‐caprolactone under microwave irradiation
Author(s) -
Liao L. Q.,
Liu L. J.,
Zhang C.,
He F.,
Zhuo R. X.
Publication year - 2003
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.12911
Subject(s) - polymerization , exothermic reaction , polymer chemistry , materials science , monomer , ring opening polymerization , microwave , yield (engineering) , caprolactone , activation energy , induction period , bulk polymerization , chemistry , radical polymerization , polymer , organic chemistry , catalysis , composite material , physics , quantum mechanics
Abstract The thermal effect of microwave energy on ε‐caprolactone (CL) monomer and polymerization reaction mixture of CL with stannous octoate [Sn(Oct) 2 ] intimately depended on the power level of microwaves and the mass scale of materials. When 10 g of CL was heated by microwaves at a power of 680 W, its temperature increased rapidly from 20 to 355°C within 5 min after which it was self‐regulated to keep constant at 360°C. Heat generation was observed when a polymerization reaction mixture of 10 g CL with 0.1% (mol/mol) Sn(Oct) 2 was irradiated at 680 W. The exothermic peak was recorded at 2–5 min and its temperature was over 300°C, with the maximum at 343°C. During this period the ring‐opening polymerization of CL occurred quickly, resulting in poly(ε‐caprolactone) with weight‐average molecular weight ( M w ) of 123,000 g/mol and yield of 95%. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2657–2664, 2003