挤出级改性PA6的研究

以高黏尼龙6(PA6)为基体,加入增韧剂、增塑剂,成功制备了低弯曲弹性模量挤出级改性PA6。研究结果表明,在聚乙烯接枝马来酸酐(PE-g-MAH)增韧PA6中,加入增塑剂己内酰胺,大幅改善了PA6的柔顺性。当己内酰胺用量为12.5份、PE-g-MAH用量为12份时,增韧PA6的弯曲强度及弯曲弹性模量分别达到15.3 MPa和600 MPa,而悬臂梁缺口冲击强度高达109.4 k J/m2,从而使增韧PA6保持了一定的刚性,同时还具有橡胶的柔顺性。差示扫描量热分析表明,加入己内酰胺并没有破坏PA6分子内部的氢键,反而增加了PA6分子链段重排的能力,使其规整度进一步增加,当己内酰胺用量从0份增加至10份时,PA6的结晶度从34.21%提高到40.58%。

Study on Extrusion Grade Modified PA6

The extrusion grade modified nylon 6 (PA6) with low flexural modulus was prepared by the high viscosity PA6 resin as matrix and the addition of toughener and plasticizer. The results show that the flexibility of the polyethylene grafted anhydride (PE-g-MAH) toughening PA6 was greatly improved by the addition of plasticizer caprolactam. When the contents of caprolactam and PE-g-MAH are 12.5 phr and 12 phr respectively,the flexural strength and flexural modulus of the PA6 reach 15.3 MPa and 600 MPa respectively ,and the Izod notched impact strength is as high as 109.4 kJ/m2,so that the modified PA6 retains certain rigid,meanwhile has the flexibility of rubber. DSC analysis shows,the addition of caprolactam does not destroy the PA6 internal hy-drogen bonding,on the contrary,increases the rearrangement ability of molecular chain and regularity,so the crystallinity of nylon 6 increases from 34.21% to 40.58% when the content of caprolactam increases from 0 phr to 10 phr.