PP/Talc复合材料的非等温结晶动力学

NON-ISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE/TALC COMPOSITES

用差示扫描量热法(DSC)研究聚丙烯(PP)及PP/Talc复合材料的非等温结晶过程,加入滑石粉后,PP/Talc的结晶速率、结晶度得到明显提高。结合Avrami和Ozawa方程得出一个适合于非等温的结晶动力学方程,并由此获得PP/Talc复合材料的非等温结晶动力学参数,计算表明Talc能促进PP材料的结晶。

The non-isothermal kinetics of polypropylene/talc (PP/Talc) composites and polypropylene (PP) were investigated by using differential scanning calorimetry(DSC). The crystallization rate and the relative crystallization degree of PP/Talc composites is higher than those of pure PP, which causes the change of growing way for crystal nucleus and is advantageous to the processing and properties for PP/Talc composites. A new kinetic equation of non-isothermal crystallization was obtained by combining Avrami and Ozawa equations. Kinetic parameters of the new equation were calculated. The results indicate that talc actually acts as a nucleating agent for PP/talc composites and the modified talc can especially promote the comprehensive property.