Title page for ETD etd-61798-17438


Type of Document Dissertation
Author Muggli, Mark W.
Author's Email Address mmuggli@vt.edu
URN etd-61798-17438
Title Physical Aging and Characterization of Engineering Thermoplastics and Thermoplastic Modified Epoxies
Degree PhD
Department Chemistry
Advisory Committee
Advisor Name Title
Ward, Thomas C. Committee Chair
Dorn, Harry C. Committee Member
Marand, Hervé L. Committee Member
McNair, Harold M. Committee Member
Wilkes, Garth L. Committee Member
Keywords
  • polymers
  • dilute solution
  • physical aging
  • relaxation time distribution
Date of Defense 1998-05-14
Availability restricted
Abstract
Physical Aging and Characterization of Engineering Thermoplastics and

Thermoplastic Modified Epoxies

Mark W. Muggli

(ABSTRACT)

In this work the relationship between physical properties, such as physical aging

and relaxation time distributions, and chemical structure for a variety of polymeric

systems were investigated. Although there is a vast amount of physical aging data for

polymers, most of these studies do not attempt to correlate structure with physical aging.

Therefore, a set of engineering thermoplastics was examined with the goal of relating

certain of their characteristic molecular dimensions to their mechanical and volumetric

physical aging attributes.

Another series of polymeric materials, based on a poly(ether sulfone) backbone,

and having various endgroups differing in size, was also studied to determine physical

aging rates and relaxation time distributions. Furthermore, it was concluded that the

density of the poly(ether sulfones) increased while the glass transition temperature

decreased as the endgroup became smaller.

Thermoplastic toughened epoxies were also examined to clarify the importance of

covalent bonds between toughener and epoxy on physical aging, relaxation time

distributions and fracture toughness. In these studies the covalently bonded tougheners

differed from their non-reactive counterparts in the rates of volumetric physical aging at

high temperatures for the difunctional epoxy. The solvent resistance of the reactive

thermoplastic toughened tetrafunctional epoxy was higher than the non-reactive

thermoplastic toughened system. The tetrafunctional epoxies with the reactive toughener

also had higher toughener glass transition temperatures.

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