Study On Non-isothermal Crystallization Kinetics And Crystalline Morphology Of Pet Fibers Filled Ipp Composites

Fibers (such as glass fiber, carbon fiber, etc.) have good role in iPP heterogeneous nucleation and induced iPP crystallized usually to form transcrystallinity. The performance of the composite which was composed of fiber and thermoplastic depends on the crystal morphology, as the fiber has a high surface activity, the crystallization of the polymer can have a greater impact. Therefore, the study of fiber on crystallization of polymer blends on the optimal performance of composite materials is of great significance.In this paper, differential scanning calorimeter (DSC) was used to study non-isothermal crystallization of PET fiber / iPP composite with different content of PET fiber. The impact of the content of PET fiber and cooling rate on PET fiber / iPP composite material properties of non-isothermal crystallization was studied. Jeziorny law and MO. law were used on non-isothermal crystallization data for processing. And further we use polarizing microscope to observe the impact of PET fiber on semi-crystalline polyolefin polymer crystallization behavior and crystalline structure. In this paper, the main conclusions drawn are as follows:1)PET fibers have a good role in iPP heterogeneous nucleation; The crystallization temperature of iPP increased and the crystallization time was reduced because of PET fibers; By introducing PET fibers crystallization rate increased and the crystallization melting point peak of iPP became lower.2) With the increase in cooling rate, the crystallization bit exothermic peak of iPP and PET fiber/iPP composite materials moving gradually toward the low-temperature and deformation peak width.3)Jeziorny method and Mo. method were used to process the data of non-isothermal crystallization. Results showed that the PET fiber/iPP composite material appears twice crystallization and two-stage crystallization kinetic parameters were very different. So we can include that PET fiber/iPP composites compared to pure iPP crystallization process more complex. 4) By using hot stage polarizing microscope, we can observe that the PET fiber has a good crystalline nucleation on iPP and iPP was induced to form transcrystallinity around PET fibers.