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Non-isothermal Crystallization Kinetics and Nucleation Activity of Filler in Polypropylene/Microcrystalline Cellulose Composites

ZHU XIU LING نويسنده , WANG CHAO SHENG نويسنده , WANG Biao نويسنده , WANG HUA PING نويسنده

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The non-isothermal crystallization kinetics of isotactic polypropylene (iPP) and iPP/microcrystalline cellulose 1 (MCC1) (hydrolyzed by HCI) and iPPI microcrystalline cellulose 2 (MCC2) (hydrolyzed by H2S0 4) composites were investigated by differential scanning calor imetry techniqye (DSC) with various cooling rates . The Avrami , Ozawa , and Mo equations were appl ied to describe the non-isothermal crystallization kinetics and to determine the crystallization parameters of the composites. The results show that the values of t1l2 for iPP/MCCs compos ites are lower than that for iPP. The value of F(T) systematically increases with increasing relative degree of crystallinity. Non-isothermal crystallizations of iPP/MCCs composites correspond to tridimensional growth with heterogeneous nucleation and MCCs acted as nucleating agent in iPP matrix. The addition of microcrystalline cellulose has greatly reduced the spherulitic size of iPP.

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