Strain-induced crystalhzation

Syndiotactic polystyrene will strain-induce crystalhze, as well as quiescently crystallize as discussed previously. Furthermore, imder certain conditions, it may also be quenched to the amorphous state. In injection molded parts, these processes may lead to skin/core differences in morphology that can be observed (111,112). With higher temperature molds (>150°C) the parts are generally fully... 

The main conclusions concerning the strain-induced crystalhzation behaviour of high-fra 5-polybutadiene-based rubber and natural rubber are (1) the rate of crystallization is extremely rapid compared with that of NR (2) the amount of strain-induced crystallization is small compared with that of NR, especially at room temperature and (3) for the HTSBRs relative to NR, crystallization is more sensitive to temperature at low extension ratios, and crystallization is less sensitive to strain. 

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