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When thermoplastic polyester is molded under the wrong conditions (too high a temperature or the presence of moisture), it degrades without changing its appearance significantly. Thermal degradation can result in reduced melt viscosity and lower mechanical properties.
A comparison of viscosity index measurements on granules and parts enables us to assess polymer degradation during processing.
Impact resistance measurements, before and after molding, can also be used to assess processing quality.
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References
- WAMBACH (A.D.), KRAMER (M.) - Thermoplastics polyesters exhibit stable electrical and mechanical properties in hot, moist environments (Les polyesters thermoplastiques présentent des propriétés électriques et mécaniques stables dans des atmosphères chaudes et humides). - 29 th Annual Technical Conference,...
Standards and norms
Association française de normalisation Afnor http://www.afnor.fr
- Plastiques. Détermination du taux de cendres. Polyalkylène téréphtalates - NF T 51-540 - 11-85
- Poly(éthylène téréphtalate) en granulés. Détermination de la teneur en eau - NF T 51-541 - 10-82
- Plastiques. Détermination du comportement à la fusion (température de fusion ou plage de températures de fusion) des polymères semi-cristallins...
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