Fundamental Studies of Time-Dependent Response and Fracture of Cross- Linked Polymers
Abstract
The objectives of these studies are: i) To determine the relationships of polymer structure, network topology and other microstructural features to time-dependent, small deformation properties such as creep and volume relaxation in thermosetting resins. ii) To determine the relationships between polymer network structure and the fracture energy of thermosetting resins. Epoxy resins based on diglycidyl ether of bisphenol A (DGEBA) and diamino diphenyl sulfone (DDS) have been prepared using an homologous series of 5 prepolymer molecular weights and a stoichiometric ratio of reactants. Resultant networks were characterized as a graded series having increasing network chain lengths and decreasing T(g). The series of Epoxy resins based on the diglycidyl ether of bisphenol A has been extensively investigated during and after curing. The degree of cure was monitored by four different methods: 1) density increase, 2) heat of reaction evolution, 3) glass temperature, T(g), increase, and 4) infrared absorption by the glycidyl ether group. The epoxy resins studied indicated that only a single reaction path was followed during the curing but the kinetics were, of course, highly temperature sensitive.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1989
- Accession Number
- ADA216694
Entities
People
- Ernst Von Meerwell
- Frank N. Kelley
- Maurice Morton
Organizations
- University of Akron