Time-Dependent Response and Fracture of Cross-Linked Polymer.
Abstract
This study was concerned with the synthesis, preparation and characterization of cross-linked polymers, and their time-dependent fracture behavior. Emphasis was given to well-defined polymer network structures of two types: (1) end-linked terminally functional liquid polymers having nearly uniform or deliberately distributed initial chain lengths, and (2) model glassy networks in which the network topology was varied with respect to chain length per cross-link, and network defects such as dangling ends and soluble fraction. Also, a model rubber-toughened resin was developed by dispersing well-characterized rubber particles, made separately from the matrix, into an epoxy matrix resin. Thermally stable poly(n-butyl acrylate) based particles, cross-linked and functionalized, had their size and size distribution controlled by the polymerization method. Differences were observed in the fracture energies of the individual matrix resins containing different rubber particle sizes and particle reactivity. The model composite fracture energies display maxima when plotted against weight percent particles. A theoretical model for rubber toughening by Kunz-Douglass, et al. was examined but this model was shown to be inadequate in predicting the composite fracture energy dependence on constituent properties, as well as in predicting the correct functional form.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1986
- Accession Number
- ADA172047
Entities
People
- D. Plazek
- F. N. Kelley
- M. Morton
Organizations
- University of Akron