PA6/PP/PP-g-MAH复合材料非等温结晶性能及可发泡性能研究

Non-isothermal Crystallization Property and Foaming Property of PA6/PP/PP-g-MAH Composites

通过双螺杆挤出机制备出PA6／PP／PP‐g‐MAH（聚酰胺6／聚丙烯／马来酸酐接枝聚丙烯）复合材料，并以PA6／PP／PP‐g‐MAH为原料，使用化学发泡剂在双螺杆挤出机上制得PA6／PP／PP‐g‐MAH发泡材料。利用差示扫描量热仪（DSC）和热场发射扫描电镜（FESEM）研究了PP‐g‐MAH对PA6／PP／PP‐g‐MAH中PA6相非等温结晶性能和可发泡性能的影响。研究结果表明：PP‐g‐MAH的加入对PA6相的熔融行为并没有显著的影响，但却使其结晶温度略有下降；PP‐g‐MAH的加入并没有改变PA6相晶体的成核方式及生长机理，但能使晶体生长速率有不同程度的下降，PA6相的非等温结晶动力学始终符合Jeziorny和莫志深模型；PA6／PP／PP‐g‐MAH发泡材料的发泡倍率和泡孔直径随着PP‐g‐MAH含量的增加而逐渐减小，但其泡孔密度随着PP‐g‐MAH含量的增加先增加后降低；在实验范围内，当PP‐g‐MAH含量为5phr时，PA6／PP／PP‐g‐MAH的可发泡性能最好。

PA6/PP/PP‐g‐MAH （ Polyamide 6/Polypropylene/Maleic Anhydride Grafted Polypropylene） composites were prepared by a twin‐screw extruder and then PA6/PP/PP‐g‐MAH foaming material was prepared with chemical foaming agent in the twin‐screw extruder .DSC （differential scanning calorimetry） and FESEM （field emission scanning electron microscopy ） were applied to study the influence of PP‐g‐M A H on non‐isothermal crystallization property and foaming property of PA 6 in PA6/PP/PP‐g‐MAH .The results show that ,the addition of PP‐g‐MAH has no significant influence on fusion behavior of PA6 phase ,but it decreases the crystallization temperature of PA6 phase .The addition of PP‐g‐MAH doesn’t change the nucleation and grow th mechanism of PA 6 phase crystal ,but declines grow th rate of the crystal by different degrees .Non‐isothermal crystallization kinetics of PA6 phase always conforms to Jeziorny’ s and Mo’ s models .foaming ratio and cell diameter of the PA6/PP/PP‐g‐MAH gradually decrease as the rise in PP‐g‐M A H content ,but its cell density first increases and then decreases as the increase in PP‐g‐MAH content .In the experimental range ,the foaming property of PA6/PP/PP‐g‐MAH is optimal w hen PP‐g‐MAH content is 5 phr .