磷酸酯钠盐/滑石粉调控聚丙烯的退火研究

Study on Annealing of Polypropylene Controlled with Phosphate Sodium and Talc

采用挤出共混法制得聚丙烯/磷酸酯钠盐/滑石粉(PP/NA-40/Talc)复合体系,研究了退火时间和退火温度对PP/NA-40/Talc复合体系力学性能、热变形温度以及结晶度的影响。通过DSC、XRD和FTIR证明了退火处理可以使PP/NA-40/Talc复合体系结晶度和力学性能提升。结果表明,PP/NA-40/Talc复合体系的力学性能、热变形温度以及结晶度与退火时间和退火温度成正相关;尤其是在120℃下退火处理2 h时,弯曲模量达到2516.0 MPa,热变形温度达到136.9℃,结晶度达到49.5%。

Polypropylene/Nucleating Agent Sodium Phosphate/Talc (PP/NA-40/Talc) system were prepared by extrusion blending method. The effects of annealing time and annealing temperature on mechanical properties, heat distortion temperature and crystallization properties of PP/NA-40/Talc system were studied. It is proved by DSC, XRD and FTIR that the annealing treatment can improve the crystallinity and mechanical properties of PP/NA-40/Talc system. The results show that the mechanical properties, the heat distortion temperature and the crystallization properties of PP/NA-40/Talc system are positively correlated with annealing time and annealing temperature. Especially after annealing at 120 ℃ for 2 h, the flexural modulus, the heat distortion temperature and the crystallinity reached 2516.0 MPa, 136.9 ℃ and 49.5 % respectively.