分子筛负载有机磷酸酯成核体系对聚丙烯性能的影响研究

采用溶液浸渍法制备了不同分子筛负载有机磷酸酯（MBP）成核体系，研究其对等规聚丙烯（iPP）结晶性能和力学性能的影响，并通过扫描电子显微镜观察不同分子筛对MBP的分散情况，进而揭示不同分子筛负载MBP对iPP成核性能提升差异的原因。结果表明，B类分子筛?1和B类分子筛-2负载MBP对iPP性能影响有限。而A类分子筛-1和A类分子筛-2负载MBP成核体系对iPP的性能提升明显：不仅促使iPP的结晶温度分别提高了10 ℃和6 ℃；也在促使iPP的弯曲模量分别提高29.9 %和13.0 %的同时，使得其冲击强度分别提升8 %和7 %，起到了有效的刚韧平衡的作用。成核体系的SEM结果表明，A类分子筛-1的加入能有效分散MBP，从而促使其在iPP当中发挥成核性能；而B类分子筛?1本身团聚严重，无法很好地分散MBP，因此无法发挥提升iPP成核性能的作用。

Effect of Zeolite?loaded Organophosphate Nucleation System on Properties of Polypropylene

A nucleation system based on the zeolite-loading organic phosphate （MBP） was fabricated through a solution immersion method， the influence of this nucleation system on the crystalline and mechanical properties of isotactic polypropylene （iPP） was investigated. The effect of different types of zeolites on the dispersion of MBP was characterized using scanning electron microscope （SEM） to investigate the reason why the zeolites can improve the nucleation of MBP in iPP. The results indicated that the MBPs loaded with B-zeolite-1 and B?zeolite-2 had little effect on the performance enhancement of iPP. However， both of them improved the properties of iPP significantly. The nucleated iPP achieved an increase in crystallization temperature by 10 and 6.0 °C for he MBPs loaded with B-zeolite-1 and B-zeolite-2， respectively. The stiffness and toughness increased synchronously. The flexural modulus resulting from the MBPs loaded with B?zeolite-1 and B-zeolite-2 increased by 29.9 % and 13.0 %， respectively. The impact strength from the MBPs loaded with B?zeolite-1 and B?zeolite-2 increased by 8 % and 7 %， respectively. SEM observation indicated that the A?zeolite-1 was well dispersed in the MBP， generating a good nucleation effect on the crystallization of iPP. B-zeolite-1 showed serious self-agglomeration and could not be dispersed in the MBP. Therefore， it cannot act as a nucleation agent to promote the nucleation of MBP.