Premium
Molecular weight advancement of poly(ethylene ether carbonate) polyols
Author(s) -
Harris Robert F.
Publication year - 1989
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.1989.070380306
Subject(s) - polyol , diethylene glycol , ethylene glycol , ethylene carbonate , transesterification , polymer chemistry , chemistry , ether , dispersity , organic chemistry , hydrolysis , carbonate , sodium carbonate , dimethyl carbonate , catalysis , materials science , polyurethane , sodium , electrode , electrolyte
Poly(ethylene ether carbonate) polyols have been prepared from ethylene carbonate and monoethylene glycol (MEG) or diethylene glycol (DEG) using sodium stannate trihydrate as catalyst. When these polyols (catalyst removed) are heated to elevated temperatures (< 180°C) at reduced Pressures, volatile impurities are removed, as distillate, molecular weight builds in a controllable manner. This is thought to be a transesterification process in which OC(O)CH 2 CH 2 OCH 2 CH 2 OH end groups on one molecule react with carbonate moieties on a second molecule with loss of DEG. These advanced polyols form rapidly with high CO 2 retention and relatively low polydispersity. This process has been characterized by size exclusion chromatography, quantitative capillary gas chromatography of the distillates, 13 C‐NMR of the products, and alkaline hydrolysis of the products followed by quantification of the resultant glycols. The advanced polyols are largely alternating copolymers of DEG and CO 2 . They are valuable polyols for polyurethane fabrication.