原位增容法制备PA6/EPDM/MMT复合材料流变性能的研究

Study on Rheological Property of PA6/EPDM/MMT Composites through In-situ Compatibilization

通过原位增容法制备了PA6/EPDM/MMT三元纳米复合材料,采用熔体质量流动速率试验机和毛细管流变仪研究了PA6及三元纳米复合材料流变行为,并对其lgγω-lgτω、lgηa-lgγω、lgηa-1/T曲线进行了分析。结果表明,在230～245℃及剪切应力为24.5～73.5MPa时,PA6及其三元纳米复合材料均为假塑性流体;EPDM、MMT的加入明显地降低了纯PA6的非牛顿指数n,并且使PA6的黏流活化能ΔE较大幅度的升高,但EPDM/MAH/DCP混合物用量的增加对ΔE的影响不明显。随着EPDM/MAH/DCP用量的增加,复合材料的黏度先增加后减小,EPDM/MAH/DCP用量达到20%时达到最大值。

The rheological behavior of nylon 6（PA6）and PA6/ethylene propylene diene monomer（EPDM）/montmorillonite（MMT）ternary nanocomposites had been prepared through in-situ compatibilization and studied by means of melt flow rate testing machine and XLY-Ⅱcapillary rheometer.The cures of lgγω-lgτω,lgηa-lgγω,lgηa-1/T were analyzed.The results of the experiments showed that both PA6 and PA6/EPDM/MMT ternary nano-composites were pseudo plastic fluids in the range of 230～245 ℃ and the shear stress of 2.45×10^4～7.35×10^4 Pa.Adding EPDM and MMT in PA6 caused the non-Newtonian index of pure PA6 decreased and the flow activation energy of PA6 increased remarkably,but the contents of EPDM/MAH/DCP mixture had little effect on the flow activation energy.With the increases of EPDM/MAH/DCP content,the viscosity of the melts first increased and then decreased,and it reached the maximum value when the EPDM/MAH/DCP content was 20 wt%.