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 Keywords
- Powder metallurgy
- Sintering consolidation polycarbonate powder
Date of Defense 1996-01-01 Availability unrestricted AbstractAlthough 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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