Hyperbranched polyglycerols of various structures were used as polyol components cured with polymeric methylenediphenyldiisocyanate (PMDI) or polymeric hexamethylenediisocyanate (PHDI). Resultant adhesives were thermally degraded in temperature range 20 - 500潞C. Performance of polyurethane based on fully ...
After vacuum distillation to remove acetone, the PUDp was obtained and then mixed with four different hardeners: IPDI, hexamethylene diisocyanate (HDI), polyethylene glycol (PEG) modified PIPDI (polymeric IPDI) and PEG-modified PHDI (polymeric HDI). The NCO/OH molar ratio of 1.5 was used and...
Diisocyanates containing benzene rings can better improve the thermal performance of adhesives, where PMDI containing a biphenyl ring is the best, while aliphatic isocyanate groups have a greater improvement in adhesion performance, and the adhesion performance of PHDI with a long carbon chain is the...