Date of Award

Spring 1978

Document Type

Thesis

Department

Mechanical & Aerospace Engineering

Program/Concentration

Engineering Mechanics

Committee Director

John M. Kulman

Committee Member

Stephen G. Cupschalk

Committee Member

Howard L. Price

Committee Member

A. Sidney Roberts

Call Number for Print

Special Collections; LD4331.E57W34

Abstract

Temperature effects on the viiscosity of an epoxy resin (diglycidyl ether of bisphenol A - DGEBA), an elastomer (carboxy terminated butadiene acrylonitrile - CTBN), and two blends containing nominally 10 percent elastomer were examined from strain rates of 0.1 sec-1 to 10,000 sec-1 over a temperature range from 300K to 450K. All results indicated the greatest drop in viscosity occurred for each of the materials over the temperature range of 300K to 350K. In addition, the materials exhibited Newtonian responses over the entire strain rate range, Adding small amounts of elastomer to the I epoxy only moderately effected the viscosity, whereas the catalyst, triphenylphosphine, added to one of the blends did not measurably change the viscosity. Activation energies over the test temperature range were calculated using the Arrhenius relationship between viscosity and inverse temperature. Two distinct activation energies were found for each material in the temperature ranges 300K to 350K and 400K to 450K, indicating the existence of two different molecular flow mechanisms in these two temperature ranges.

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DOI

10.25777/5k9m-zg22

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