ALTERNATING COPOLYMERS OF TETRAMETHYLENE UREA WITH 2,2-DIMETHYLTRIMETHYLENE CARBONATE AND ETHYLENE CARBONATE - PREPARATION OF THE CORRESPONDING POLYURETHANES

Authors
SCHMITZ F KEUL H HOCKER H
Citation
F. Schmitz et al., ALTERNATING COPOLYMERS OF TETRAMETHYLENE UREA WITH 2,2-DIMETHYLTRIMETHYLENE CARBONATE AND ETHYLENE CARBONATE - PREPARATION OF THE CORRESPONDING POLYURETHANES, Macromolecular rapid communications, 18(8), 1997, pp. 699-706
Citations number
8
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecular rapid communications → ACNP
ISSN journal
10221336
Volume
18
Issue
8
Year of publication
1997
Pages
699 - 706
Database
ISI
SICI code
1022-1336(1997)18:8<699:ACOTUW>2.0.ZU;2-3
Abstract
Copolymerization of tetramethylene urea (TeU, 1) with the cyclic carbo nates 2,2-dimethyltrimethylene carbonate (DTC, 2) and ethylene carbona te (EC, 3) results in the polyurethanes 4 and 5 with an approximate nu mber-average molecular weight of 20000 and a polydispersity index of t wo. Polyurethane 4 is an amorphous material with a glass transition te mperature of 26.3 degrees C; polyurethane 5 is a semicrystalline mater ial with a melting temperature of 208 degrees C. Distinct copolymeriza tion mechanisms are proposed for the formation of polyurethane 4 and 5 , respectively.