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2. Properties
2.1 Structure
PBT and PET are semi-crystalline polymers (in the solid state, part of the material is amorphous and the rest is crystallized).
The crystallinity rate does not exceed 40-50% by volume. A number of factors influence the rate of crystallization:
the chemical nature of the polymer: PBT crystallizes much faster than PET ;
the molecular weight of the polymer: the higher the molecular weight, the lower the crystallization rate;
temperature.
For PET, the crystallization rate is highest at around 175 C. Still sufficient between 130 and 140 C to enable molding cycle times of less than 1 min, it becomes too...
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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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