聚丙烯/石墨烯纳米复合材料的非等温结晶动力学研究

Study on Nonisothermal Crystallization Kinetics of PP/RGO Nanocomposites

通过液相共混法制备了聚丙烯/石墨烯(PP/RGO)纳米复合材料,利用差示扫描量热仪(DSC)探讨了非等温条件下的PP/RGO复合材料的结晶动力学。结果表明:快速冷却以及引入RGO均能促进复合材料的结晶;RGO的加入同时提高了复合材料中PP的结晶速率和绝对结晶度,并降低了PP的结晶活化能,这说明RGO起到了成核剂的作用,促进了PP的结晶;另外,采用Ozawa法和莫志深(Mo)法修正的Avrami方程均可较好地描述纯PP和PP/RGO的非等温结晶过程。

Polypropylene/reduced graphene oxide （PPIRGO） nanocomposites were prepared by solution blending method, and the nonisothermal crystallization kinetics of the PP/RGO nanocomposites was investigated by differential scanning calorimetry （DSC）. The results show that： both rapid cooling and adding RGO can promote the crystallization of PP/RGO composites. The crystallization rate and crystallinity of PP improve with the addition of RGO, and the crystallization activation energy of PP/RGO decreases, it indicates that RGO can serve as a nucleating agent and promote the crystallization of PP. Moreover, the Avrami theory modified by Ozawa method and Mo method can describe the nonisothermal crystallization kinetics of pure PP and PP/RGO successfully.