Crystallization fusion conditions prior

When a crystallizable dispersed phase is used, fiactionated crystallization may occur. In such a confined polymer phase, the composition and surrounding conditions will play a major role in the crystallization processes. The structures of the aystals formed are defined by the following factors MW, microstructure of the polymer chain fusion condition prior to crystallization, miscibility, etc., therefore, to effectively develop polymer blends with improved crystallinity, the necessary factors must be carefully considered. 

Due to the crystal memory effect, the starting structure, temperature (T and time of fusion prior to crystallization might influence the polymorphic behavior of polymers in the following cold or melt crystallization. An interesting example is s-PS. The a-form aystals of s-PS are exclusively obtained upon melt crystallization when traces of the a-form nuclei are present and not erased completely at low Tj (e.g., 280 °C). In contrast, once the crystal nuclei are completely removed at high (e.g., 380°C), only the thermodynamically stable p-form crystals are obtained under the same crystallization conditions [125]. 

---