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Polymerization of Lactides and Lactones, 8. Study on the Ring‐Opening Polymerization of 3‐Phenyl‐ ε ‐caprolactone and 5‐Phenyl‐ ε ‐caprolactone
Author(s) -
Deng Xianmo,
Yuan Minglong,
Cao Xiaojun,
Li Xiaohong
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010701)202:11<2417::aid-macp2417>3.0.co;2-c
Subject(s) - polymerization , caprolactone , polymer chemistry , chemistry , ring opening polymerization , polyester , monomer , molar mass distribution , polymer , organic chemistry
Abstract Ring‐opening polymerization of 3‐phenyl‐ ε ‐caprolactone (3‐ph‐CL) and 5‐phenyl‐ ε ‐caprolactone (5‐ph‐CL) by tin(II) salt, Al(O i Pr) 3 and CpNa has been studied; 3‐ph‐CL cannot be initiated by Al(O i Pr) 3 . Polymerization of 5‐ph‐CL initiated with Al(O i Pr) 3 in toluene at 15°C yielded a polymer of a predictable molecular weight and a narrow molecular weight distribution. 3‐ph‐CL and 5‐ph‐CL can be polymerized by initiating with tin(II) salt, and CpNa. In CpNa‐based polymerization, high molecular weight P(3‐ph‐CL) and P(5‐ph‐CL) were obtained. DSC studies indicate that P(5‐ph‐CL) is an amorphous material, exhibiting a rubber state at room temperature. Compared with PCL, the glass transition temperature of P(3‐ph‐CL) and P(5‐ph‐CL) is higher (–60°C), in contrast to the melting temperature, which is higher for PCL. These new monomers give a route to novel aliphatic polyesters.