US EPA

7762948 

Journal Article 

Polyurethanes (II): Products of polyaddition of bis(4-hydroxyethylenethio)diphenyl ether with 1,6-hexane diisocyanate 

Wdowicka, D; Podkoscielny, W; Maziarczyk, H 

1997 

Yes 

Iranian Polymer Journal
ISSN: 1026-1265 

6 

4 

253-260 

English 

WOS:000072558100004 

We report new linear polyurethanes synthesized by polyaddition reaction of bis(4-hydroxyethylenethio)diphenyl ether with 1,6-hexane diisocyanate. Two synthetic variants are applied, in solution or in melt, with or without a catalyst. Good results are obtained using aprotic solvent, N,N-dimethylformamide, ca. 25% weight concentration of monomers, dibutyl tin dilaurate as a catalyst, and conducting the process at 90-100 °C for 3.5-4.0 h. Basic physico-chemical properties of polyurethanes obtained are presented. Thermal behaviour of the polymers is analyzed by means of thermogravimetry and DSC. The structure of resulting products is characterized by elemental analysis, FTIR spectrum and X-ray analysis. Effect of partial replacement of bis(4-hydroxyethylenethio)diphenyl ether by 20-70 mol% 1,6-hexanediol on the properties of polyurethanes obtained in the optimal conditions established earlier has been investigated. 

linear polyurethanes; polyaddition optimal conditions; thermal stability; modification