Title page for ETD etd-08142006-110121

Type of Document Dissertation
Author Vick, Linda Wagnecz
URN etd-08142006-110121
Title Solid-state processing of thermoplastic polymers
Degree PhD
Department Materials Engineering Science
Advisory Committee
Advisor Name Title
Davis, Richey M. Committee Chair
Dillard, David A. Committee Member
Kander, Ronald G. Committee Member
Loos, Alfred C. Committee Member
Love, Brian J. Committee Member
  • Powder metallurgy
  • Sintering consolidation polycarbonate powder
Date of Defense 1996-01-01
Availability unrestricted
Although compaction and sintering of polymeric powders has been investigated since the

early 1970's, this processing method is not widely used, possibly because the fundamental

mechanisms which control compaction and sintering have never been fully understood.

This study has made significant contributions to our understanding of compaction and

sintering of polymers. It was demonstrated that mechanical properties (yield strength,

modulus) and physical characteristics (degree of physical aging, glass transition

temperature, presence of crystallinity) of the particles, and thus, powder processing,

storage, and handling techniques, affect the ability of the polymer to be successfully

compacted. The difficulties encountered in sintering polymeric compacts were explained

in terms of a loss of configurational entropy of the polymer molecules during compaction,

which caused large-scale dimensional recovery in the particles upon heating above T8.

Hot compaction (above room temperature, but below T8) was not found to be useful in

eliminating recovery during pressureless sintering. However, consolidation of compacts

formed at room temperature (by heating 10-20°C above T8 and applying a small pressure

(less than 50 kPa)) was shown to be a promising processing method.

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