Study Of The Crystallization Morphology And Kinetics Of MCC/PHBV Composites

Poly(β-hydroxybutyrate-co-(3-hydroxyvalerate) is a bacterial copolymer, MCC/PHBV composites were prepared by way of banburying, By polarized optical microscope (POM), differential scanning calorimetry(DSC), dynamic mechanical analysis(DMA) and wide-angle X-ray diffraction(WAXD) equipments, crystallization properties of MCC/PHBV composites were analyzed and characterized, The results showed that:By adding microcrystalline cellulose(MCC) into PHBV materials, In the process of isothermal crystallization, the nucleation density of PHBV increased with the increasing of the content of MCC. However, the growth of the spherulite has not been hindered, the time of Crystallization is reduced accordingly, and compared with the pure PHBV materials, the grains of the composites had been significantly refined. For MCC/PHBV composites with the same content of MCC, Microcrystalline cellulose treated with silane coupling agent or not, it seems did not have significant effect on the nucleation density.Analysis of nonisothermal crystallization kinetics showed that, Kinetic parameters Z(?) of the composites increased with the increasing of the content of MCC, however, Kinetic parameters n of the composites decreases. It means that the crystallization rate of the PHBV material increased, MCC has played the role of heterogeneous nuclear agents in PHBV material.The result of DMA show that,with the increasing of the MCC content, crystallization formed during the cooling process increased, and it's more complete. The result of DMA show that, the storage modulus of the composites gradually increased with the increasing of the MCC content, and a certain of MCC as additive increased the stiffness of PHBV.The results of WAXD show that, the crystal lattice of the composites is P-(3HB).