PE-HD-g-MAH共混改性PA612性能研究

通过马来酸酐接枝高密度聚乙烯(PE-HD-g-MAH)熔融共混改性尼龙612(PA612),研究了玻纤增强改性后的PA612复合材料。结果发现,随着PE-HD-g-MAH含量增加,PA612的结晶温度逐渐下降。通过肉眼和光泽仪研究PE-HD-g-MAH对玻纤增强PA612表观的影响,结果发现随着接枝物的引入,相同条件下复合材料注塑后的样件浮纤更少,光泽度更高。尤其在低模温的条件下,这种差异更加明显。加入PE-HD-g-MAH共混改性后的玻纤增强PA612的复合材料对模温的要求更低,表观更好,改善了其成型性。同时,PE-HD-g-MAH的引入使拉伸强度有小幅度的下降(6%),同时可以提高其缺口冲击强度(18%),对PA612有一定的增韧效果。最后,研究了共混改性后对复合材料的吸水性及尺寸稳定性的影响。PE-HD-g-MAH可以有效降低PA612的吸水性,提高PA612复合材料制件的尺寸稳定性。

Performance Study of PA612/PE-HD-g-MAH Compounds

Nylon 612(PA612)reinforced by glass fiber was modified by melt blending of maleic anhydride grafted high density polyethylene(PE-HD-g-MAH).Then,modified PA612 was studied.It was found that the crystallization temperature of PA612 decreased as the content of PE-HD-g-MAH increased.The effect of PE-HD-g-MAH on the appearance of glass fiber reinforced PA612 by naked eye and glossmeter.The results show that added graft copolymer,the parts of composite material has a better appearance,fewer glass fibers emergence and higher glossiness.Especially at the condition of low mold temperature,the difference is more obvious.The composite material of glass reinforced PA612 after PE-HD-g-MAH blending modification has lower requirements on mold temperature,better appearance and its molding property is improved.At the same time,PE-HD-g-MAH makes the tensile strength of PA612 have a slight decrease(6%),while it can improve its notched impact strength(18%)for toughening PA612.Finally,the effects of mixed modification on the water absorption and dimensional stability of composite materials were studied.PE-HD-g-MAH can effectively reduce the water absorption and improve the dimensional stability of PA612.