Premium
Polylactones, 45. Homo‐ and Copolymerizations of 3‐Methylmorpholine‐2,5‐dione Initiated With a Cyclic Tin Alkoxide
Author(s) -
Kricheldorf Hans R.,
Hauser Karsten
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(20010401)202:7<1219::aid-macp1219>3.0.co;2-u
Subject(s) - polymer chemistry , monomer , chemistry , alkoxide , polymerization , copolymer , morpholine , amorphous solid , polymer , organic chemistry , catalysis
Morpholine‐2,5‐dione and D , L ‐3‐methylmorpholine‐2,5‐dione were polymerized with 2,2‐dibutyl‐2‐stanna‐1,3‐dioxepane (DSDOP) as initiator with variation of time and monomer/initiator (M/I)‐ratio. For comparison a few polymerizations were initiated with Sn(II) 2‐ethylhexanoate. The DSDOP initiated polymerizations gave slightly higher molecular weights, but the molecular weights were rather low in all cases and did not parallel the M/I‐ratio. Furthermore, D , L ‐3‐methylmorpholine‐2,5‐dione was copolymerized with ε ‐caprolactone ( ε ‐CL) or with L ‐lactide. 13 C NMR spectra proved the formation of nearly random sequences. Therefore, the 1 : 1 copolymers were amorphous. Higher feed ratios of ε ‐CL or L ‐lactide yielded higher molecular weights (at constant M/I‐ratio) and they yielded crystalline copolyesters as evidenced by DSC‐measurements.