Title

Molecular Weight Effects on the Mechanical Properties of Novel Epoxy Thermoplastics

Document Type

Article

Publication Date

5-1-2012

Department

Polymers and High Performance Materials

Abstract

A series of epoxy thermoplastics (ETPs) with varying molecular weights were synthesized from a difunctional diglycidyl ether of bisphenol-A (DGEBA)-based epoxy resin and an aromatic secondary diamine. The materials possessed glass transition temperatures varying between 73.61 and 85.36 degrees C. The ETP series was characterized for fracture toughness, flexural, and compression properties. In general, fracture properties increased with increasing molecular weight and yet were consistently shown to decrease when higher molecular weight values were the result of increased branching. Flexural ultimate strength and strain-at-break increased with increasing molecular weight while flexural modulus decreased to a plateau. Compression properties were relatively unaffected by changes in molecular weight over the range of materials synthesized.

Publication Title

High Performance Polymers

Volume

24

Issue

3

First Page

161

Last Page

172