Premium
Homo‐ and Copolymerization of ε‐Caprolactone and 2,2‐Dimethyltrimethylene Carbonate by Rare Earth Initiators
Author(s) -
Shen ZhiQuan,
Zhu GuiXiang,
Ling Jun
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020201136
Subject(s) - copolymer , chemistry , rare earth , monomer , carbonate , polymerization , polymer chemistry , polymer , caprolactone , crystal structure , crystallography , mineralogy , organic chemistry
Rare earth tris(2,6‐di‐tert‐butyl‐4‐methylphenolate) [Ln‐(OAr) 3 , Ln = La, Nd, Dy, Y] alone has been developed to initiate polymerization of e‐caprolactone (CL) and random copolymerization of CL with 2, 2‐dimethyltrimethylene carbonate (DTC). The structures of polymers were analyzed by GPC, ER and NMR methods. Their crystal and thermal properties were discussed in terms of DSC. The initiating efficiencies were mainly affected by the size of rare earth metal in the sequence of La(OAr) 3 > Nd(OAr) 3 ∼ Y(OAr) 3 > Dy(OAr) 3 . La‐(OAr) 3 exhibited rather high activity to prepare PCL with a molecular weight of 2.15 × 10 5 and M a /M a of 2.27. The composition of random copolymer can be quantitatively controlled either by reaction time or by feed ratio of monomer.