Abstract
Polypropylene oxide (PPO) was not vulcanized with peroxides alone, while propylene oxide-allylglycidyl ether copolymer (POR) was vulcanized.
In the vulcanization of PPO, the combinations with coagent, such as sulfur, styrene, N, N′-(m-phenylene) bismaleinimide, or divinyl benzene were necessary. Sulfur, among these coagents, had the most favorable effects on vulcanization.
Addition of polyisocyanate compounds to a dicumylperoxide-sulfur curing system greatly improved the properties of vulcanizates.
