In the reported experiments, polyurethanes were prepared by the use of alpha , omega -di(hydroxy)-polyisobutylene prepolymers having number average functionality of two by chain extension with TDI in bulk at 80 degree C. Two products have been obtained: a yellowish material in the absence of curing agent (PUR1) and a white material with 1,4-butanediol (PUR2). Elongation of PUR1 and PUR2 were 5-600% and similar 100%, respectively. DSC showed two transitions: minus 64 degree C and 81 degree C for PUR1, and minus 61 degree C and 93 degree C for PUR2. The first transition is attributed to rubbery polyisobutylene domains, while the second is due to hard TDI domains. It is anticipated that polyurethanes with polyisobutylene soft segments will exhibit superior thermal, UV, oxidative and chemical resistance to conventional polyurethanes having polyester, polyether or polybutadiene soft segments.
|Number of pages||5|
|Journal||American Chemical Society, Division of Organic Coatings and Plastics Chemistry, Preprints|
|Publication status||Published - Jan 1 1980|
|Event||Pap Presented at the ACS Natl Meet, 180th - San Francisco, CA, USA|
Duration: Aug 24 1980 → Aug 29 1980
ASJC Scopus subject areas