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Polymerization of lactides and lactones. III. Ring‐opening polymerization of DL ‐lactide by the (η 3 ‐C 3 H 5 ) 2 Sm(μ 2 ‐Cl) 2 (μ 3 ‐Cl) 2 Mg(tmed)(μ 2 ‐Cl)Mg(tmed) complex
Author(s) -
Yuan Minlong,
Xiong Chengdong,
Li Xiaohong,
Deng Xianmo
Publication year - 1999
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/(sici)1097-4628(19990929)73:14<2857::aid-app8>3.0.co;2-v
Subject(s) - polymerization , polymer chemistry , monomer , ring opening polymerization , chemistry , bulk polymerization , polymer , radical polymerization , organic chemistry
Ring‐opening polymerization of DL ‐lactide (LA) has been initiated with the (η 3 ‐C 3 H 5 ) 2 Sm(μ 2 ‐Cl) 2 (μ 3 ‐Cl) 2 Mg(tmed)(η 2 ‐Cl)Mg(tmed) complex both in bulk and solution. The effects of reaction conditions, such as reaction time, reaction temperature, and monomer/initiator molar ratio on the polymerization has been discussed. The results showed that (η 3 ‐C 3 H 5 ) 2 Sm(μ 2 ‐Cl) 2 (μ 3 ‐Cl) 2 Mg(tmed)(μ 2 ‐Cl)Mg(tmed) was more effective for the polymerization of LA, and high molecular weight of polylactide was obtained by this initiator. The solvent affected the polymerization significantly. The polymerization mechanism was in agreement with the coordination mechanism. The polymer was characterized by FTIR, 1 H‐NMR, and DSC. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2857–2862, 1999