The Role of Molecular Diffusion in the Adhesion of EDPM (Ethhylene-Propylelediene Terpolymer) and EPR (Ethylene-Propylene Copolymer) Elastomers.
Abstract
Adhesion of lightly crosslinked sheets of EPDM (ethylene-propylelediene terpolymer) to themselves and to a Mylar substrate has been investigated over wide ranges of peel rate and test temperature. The effect of incorporating ethylene-propylene copolymer (EPR) before crosslinking, to yield a loose macromolecular network containing dissolved linear EPR macromolecules, was also studied. The self-adhesion of these materials was found to be much greater than their adhesion to Mylar, over a wide range of effective peel rates. This is attributed to interdiffusion of EPR and EPDM molecular strands. At extremely low peel rates the enhancement of adhesion was smaller, probably because of back-diffusion, and at high rates, the strength of adhesion became high in all cases. These results are compared to those compared to those obtained previously for polyisobutylene-co-isoprene networks containing linear polyisobutylene molecules. The enhancement of self-adhesion at intermediate rates of peel was considerably greater for the EPDM based materials, probably because of a lower degree of crosslinking and a greater tendency to form molecular entanglements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA152259
Entities
People
- Alan Neville Gent
- M. D. Ellul
Organizations
- University of Akron