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Title: A study of the effect of thermal history on the internal structure and mechanical properties of polypropylene
Author: Procter, Brian
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1967
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The present understanding of the way in which thermal history affects the structure and mechanical properties of thermoplastics is reviewed. This research expands upon previous work by examining the effects of moulding cooling rate on the structure and transient mechanical properties of polypropylene. A technique is first developed for measuring the cooling rate and crystallisation temperature during com- pression moulding polypropylene sheets. The results obtained for the dependence of crystallisation temperature on cooling rate are predicted with good agreement by an extension of the Avrami equation, which is normally used, to describe the process of isothermal crystallisation. Measurements of density and the rate of crystallisation and optical microscopy, indicate that a change in crystallisation kinetics occurs in polypropylene at a crystallisation temperature of about 120.5°C, which results from a cooling rate of 10°C/min in the polypropylene used in this research.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available