Polypropylene catalloy was synthesized directly in reactor,which with special chain structure and supper impact strength.For the special synthetic method,its solid phase structure may be different from others. So the ...Polypropylene catalloy was synthesized directly in reactor,which with special chain structure and supper impact strength.For the special synthetic method,its solid phase structure may be different from others. So the solid phase structure of polypropylene catalloy was studied by optical microscope and WAXD.The results indicated that the crystallinity,crystal type of polypropylene are partly changed because of the coexistence of EPR,EP copolymers and PP. There appears a γ \|PP crystal when the EP copolymer amount in PP alloy is 17 18%.展开更多
Non-isothermal crystallization behavior of molten polypropylene catalloys(PP-c) was studied by using differential scanning calorimetry(DSC). Besides, crystallization process and spherulite morphology were observed thr...Non-isothermal crystallization behavior of molten polypropylene catalloys(PP-c) was studied by using differential scanning calorimetry(DSC). Besides, crystallization process and spherulite morphology were observed through polarized optical microscopy. Compared with pure polypropylene(PP), the crystallization peak temperature(t p c) of PP-c shifted to a higher temperature, and the value of t p c became bigger with the increase of ethylene component in PP-c. The spherulitic geometrical dimension of PP-c decreased distinctly, and the number of spherulite augmented obviously. It is believed that the ethylene component acts as the heterogeneous nucleation agent in PP-c.展开更多
文摘Polypropylene catalloy was synthesized directly in reactor,which with special chain structure and supper impact strength.For the special synthetic method,its solid phase structure may be different from others. So the solid phase structure of polypropylene catalloy was studied by optical microscope and WAXD.The results indicated that the crystallinity,crystal type of polypropylene are partly changed because of the coexistence of EPR,EP copolymers and PP. There appears a γ \|PP crystal when the EP copolymer amount in PP alloy is 17 18%.
文摘Non-isothermal crystallization behavior of molten polypropylene catalloys(PP-c) was studied by using differential scanning calorimetry(DSC). Besides, crystallization process and spherulite morphology were observed through polarized optical microscopy. Compared with pure polypropylene(PP), the crystallization peak temperature(t p c) of PP-c shifted to a higher temperature, and the value of t p c became bigger with the increase of ethylene component in PP-c. The spherulitic geometrical dimension of PP-c decreased distinctly, and the number of spherulite augmented obviously. It is believed that the ethylene component acts as the heterogeneous nucleation agent in PP-c.
