Accession Number : ADA184669
Title : Cure and Properties of Thermosetting Polymers.
Descriptive Note : Final rept. 1 Mar 84-31 Aug 87,
Corporate Author : PRINCETON UNIV NJ DEPT OF CHEMICAL ENGINEERING
Personal Author(s) : Gillham,John K
PDF Url : ADA184669
Report Date : Aug 1987
Pagination or Media Count : 8
Abstract : Thermosetting materials (e.g., epoxies and polyimides) are used in composites, coatings and adhesives. Unlike their thermoplastic counterparts, molecular structure macroscopic property relationships in thermosets are not well developed: hence the current research. A general model for thermosetting materials which relates polymerization to properties is being developed. In this, a time temperature transformation (TTT) cure diagram relates the principal states of matter encountered (i.e., liquid, rubber (sol/gel and gel), and glass (sol, sol/gel and gel) to gelation and vitrification phenomena. The model is extended to rubber-modified thermosetting systems to show that a given chemical formulation can provide different morphologies and hence different material behavior. It is also extended to high temperature polymers where polymerization and degradation reactions compete. Computed and experimental TTT diagrams are compared.
Descriptors : *THERMOSETTING PLASTICS, *CURING, EPOXY RESINS, POLYIMIDE PLASTICS, ADHESIVES, COATINGS, COMPOSITE MATERIALS, GELATION, THERMAL DEGRADATION, TRANSITION TEMPERATURE, ISOTHERMS, TORSION, VITREOUS STATE, POLYMERIZATION, MORPHOLOGY, HIGH TEMPERATURE, PHASE TRANSFORMATIONS
Subject Categories : Plastics
Distribution Statement : APPROVED FOR PUBLIC RELEASE