A study of the effect of thermal history on the internal structure and mechanical properties of polypropylene

Procter, Brian (1967) A study of the effect of thermal history on the internal structure and mechanical properties of polypropylene. PhD thesis, University of Glasgow.

Abstract

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

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Additional Information: Adviser: P Hancock
• Keywords: Plastics, Thermodynamics
• Date of Award: 1967
• Depositing User: Enlighten Team
• Unique ID: glathesis:1967-72360
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 24 May 2019 15:12
• Last Modified: 24 May 2019 15:12
• URI: https://theses.gla.ac.uk/id/eprint/72360