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Practical aspects of polymerization of D , L ‐Lactide initiated with tetraphenyltin
Author(s) -
Mehta Sanjay,
Raghuvanshi R. S.,
Misra A.,
Ganga S.,
Talwar G. P.
Publication year - 1995
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.1995.070580911
Subject(s) - polymerization , polymer , polymer chemistry , lactide , molar mass distribution , degree of polymerization , chemistry , ring opening polymerization , materials science , organic chemistry
Melt polymerization conditions for D , L ‐Lactide initiated with tetraphenyltin were studied with regard to polymer molecular weight. The combined effect of time and temperature on polymer molecular weight and degree of conversion of D , L ‐Lactide is described. Polymerization at constant initiator concentrations resulted in a narrow scattering of reproducible molecular weight values. The presence of air/moisture and other impurities during the melt polymerization most likely have a deterimental effect on molecular weight. After a short induction period the rather slow polymerization of D , L ‐Lactide resulted in a maximal molecular weight followed by an almost constant value of molecular weight. © 1995 John Wiley & Sons, Inc.