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Abstract
Depending on the processing conditions, Polybutylene terepthalate (PBT) exhibits different creep behavior as a result of its thermorheological history during the injection molding process, although the short-term tensile tests do not show any significant differences. With aging time, this effect is more pronounced and the difference is mainly attributed to the differences in frozen-in free volume and the crystallinity content of the material. A higher mold temperature during injection molding produces higher crystallinity and lower free volume leading to reduced creep strain, whereas a longer aging time leads to a reduction in free volume and therefore less creep. The results thus show that apart from crystallinity, free volume also plays an important role in determining the creep behavior of the semicrystalline polymers.
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