Studies on curing reaction kinetics and properties of the CPE as a modifier of polyester–urethane elastomer

✍ Scribed by Jin Liu; Zhen Li

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 388 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961121)62:8<1231::aid-app13>3.0.co;2-a

✦ Synopsis

SYNOPSIS

Chlorinated polyethylene (CPE)-modified polyester prepolymers with NCO end groups were synthesized. The chain-extension reactions of the prepolymers with 3,3'-dichloro-4,4'diaminodiphenylmethane were studied by Fourier transform infrared spectrometry and found to change from second-order reaction at lower temperature to first-order reaction at higher temperature for these reaction systems. The properties of CPE-modified polyurethane (PU) elastomers was also studied by dynamic mechanical property analysis. The experimental results showed that the CPE content increase would lead to a decrease of the mechanical properties of PU elastomers and result in a prolongation of the cream time of curing reaction systems, but would make the manufacturing process easier than before. It is suggested that the CPE may be selected as a delayed-action activator of curing reaction.