PP-g-MAH对尼龙6/炭黑复合材料性能和形貌的影响

Effect of PP-g-MAH on Properties and Morphologies of Nylon 6/Carbon Black Composites

以炭黑(CB)为导电填料,马来酸酐接枝聚丙烯(PP-g-MAH)为增韧剂,通过双螺杆挤出机和注射成型机制备了尼龙(PA)6/PP-g-MAH/CB复合材料,研究了PP-g-MAH含量对7.5%CB填充PA6力学性能、抗静电性能、热稳定性能和形貌的影响。结果表明,添加质量分数20%的PP-g-MAH可提高PA6/CB复合材料的拉伸强度、韧性、抗静电性能和热稳定性。PA6/PP-g-MAH/CB复合材料力学强度和热稳定性的提高源于PP-g-MAH产生的能量耗散以及CB,PP-g-MAH与PA6之间较好的界面粘附和PP-g-MAH均匀细化分散在PA6/CB中。PP-g-MAH改变了CB在共混物中的选择性分布,使PA6/CB的表面电阻率和体积电阻率分别下降5个和3个数量级。

Nylon 6(PA6)/maleic anhydride grafted polypropylene(PP-g-MAH)/carbon black(CB)composites were prepared by twin-screw extruder and injection molding machine with CB as conductive filler and PP-g-MAH as toughening agent,and the effects of PP-g-MAH content on the mechanical properties,thermal stability,antistatic properties and morphology of the CB filled PA6 composites were studied.The results indicate that the addition of 20%of PP-g-MAH mass fraction results in the improvement of tensile strength,toughness,antistatic properties and thermal stability of PA6/CB composites with 7.5%of CB mass fraction.The increase in mechanical strength and thermal stability of PA6/PP-g-MAH/CB composites can be explained on the basis of energy-absorption process caused by PP-g-MAH phase,better adhesion and stress transfer between CB,PP-g-MAH and PA6,and finer dispersion of PP-g-MAH in PA6/CB matrix.The presence of PP-g-MAH reduces the surface resistance and volume resistivity of PA6/CB composites by 5 and 3 orders of magnitude respectively,due to the selective localization of CB in PA6/PPg-MAH matrix.