High-Temperature Thermosets Derived from the Diels-Alder Polymerization of Bisbenzocyclobutenes and Bimaleimides
Abstract
A number of compatible mixtures of 2,2-bis4-(N-4-benzocyclobutenyl phthalimide-4-phenyl hexafluoropropane (BCB) and 1,1'-(methylene di-4, 1- phenylene) bismaleimide (BMI) were prepared. Complete compatibility of the mixtures was evidence by a single initial t sub g. All mixtures showed relatively low initial t sub g's and characteristic polymerization exotherms of benzocyclobutene-based systems providing and excellent processing window. The cured sample of the mixtures, pure BCB and BMI were subjected to comparative isothermal gravimetric analysis (ITGA). After 200 hours at 650 F (343 C) in circulating air, the cured BMI exhibited similar thermo-oxidative stabilities to BCB. A model compound was synthesized from the intimate mixture of N-phenyl maleimide and N-benzocyclobutenyl phthalimide in 63% recrystallized yield. The ITGA results and isolation of the model Diels-Alder adduct render strong support to the conviction that Diels-Alder polymerization is the predominant curing process in the BCB/BMI system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1987
- Accession Number
- ADA188800
Entities
People
- Edward J. Soloski
- Fred E. Arnold
- Loon-Seng Tan
Organizations
- Wright Laboratory