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...
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