NBR/Nano-BaSO4复合增韧PVC压延膜基体材料性能研究

用机械共混法制备了聚氯乙烯(PVC)/纳米硫酸钡(Nano-BaSO4)/丁腈橡胶(NBR)复合材料。通过压制成型制备标准試样,使用万能试验机测试复合材料拉伸强度、撕裂强度、悬臂梁缺口冲击强度,高阻抗分析仪测试表面电阻率,扫描电子显微镜(SEM)及热重分析仪(TG)进行微观形貌及热重分析,探究了NBR、Nano-BaSO4的加入量对复合材料力学性能、导电性能、热稳定性以及微观结构的影响。结果表明,NBR和Nano-BaSO4可协同增韧PVC,随着NBR和Nano-BaSO4加入量的增大,PVC复合体系的断裂伸长率、悬臂梁缺口冲击强度先增加后减少;复合体系的表面电阻率随着NBR加入量的增大而逐渐下降,随着Nano-BaSO4加入量的增大而不断上升;TG结果表明,NBR能改善PVC体系的热稳定性;SEM结果表明,NBR与PVC相容性良好。

Study on Properties of PVC Calendered Film Toughened by NBR and Nano-BaSO4 Composite

Polyvinyl chloride( PVC)/nano-bariumsulfate( Nano-BaSO4)/nitrile rubber( NBR) composites were prepared by mechanical blending method. Standard samples were prepared by press molding. Through the tensile strength, tear strength,impact strength of composites tested by universal sample machine, surface resistivity measured by a high-impedance analyzer,microscopic morphology analysed by scanning electron microscopy( SEM) and thermogravimetry analysed by thermogravimetric analyzer,the effects of the amount of NBR and Nano-BaSO4 on the conductive properties,mechanical properties, microstructure and thermal stability of the composites w ere considered. The results show that PVC can be synergistically toughened by NBR and Nano-BaSO4. With the increase of the amount of NBR and Nano-BaSO4,the elongation at break and impact strength of PVC composite systemare increasing first and then decreasing. With the increase of the amount of NBR, the surface resistivity of the composite systemis decreasing gradually. With the increase of the amount of Nano-BaSO4,the surface resistivity of the composite systemis increasing. TG results show that the thermal stability of the composites can be improved by NBR. SEMresults show that NBR has a good compatibility with PVC.