CPVC/PVC共混物的制备及性能研究

Preparation and Properties of CPVC/PVC Blend

采用熔融共混法制备CPVC/PVC共混物,使用DMA研究共混物的相容性,用转矩流变仪研究成型加工性能,考查共混比、CPE/ACR和MBS/PA-20复合增韧体系及纳米碳酸钙用量对共混物物理机械性能及成型加工性能的影响,并用扫描电镜对断口形貌进行分析.结果表明:CPVC/PVC共混物具有较好的热力学相容性; 62. 5份CPVC与37. 5份PVC共混效果最好,成型加工性能明显改善; CPE/ACR和MBS/PA-20两个复合增韧体系对共混物均有较好的增韧效果,加工性能也有较大改善,相比之下,MBS/PA-20体系效果更好;填充适量的纳米碳酸钙可以起到降低成本、改善加工性能的作用;共混物经复合增韧后由增韧前的脆性断裂转变为韧性断裂模式.

CPVC/PVC blend is prepared by melt blending method,the compatibility of the blend is studied by DMA,and the molding and processing properties of the blend are searched by torque rheometer.In this research,the blending ratio,two composite toughening systems of CPE/ACR and MBS/PA-20,and the influence of dosage of packing like Nano Calcium Carbonate on the physical and mechanical properties of the blend and the molding and processing properties are examined.The fracture appearance of the blend is analyzed by scanning electron microscope.The results show that:CPVC/PVC blend has good thermodynamic compatibility;the effect of the blend with62.5CPVC and37.5PVC is the best.The molding and processing properties of the blend are improved significantly;two composite toughening systems of CPE/ACR and MBS/PA-20have a good effect on CPVC/PVC blend,and the processing property is also promoted substantially.By contrast,the effect of MBS/PA-20composite toughening system is better;filling appropriate Nano Calcium Carbonate in CPVC/PVC blend can reduce the cost and improve molding and processing properties;after composite toughening,the blend will become ductile fracture from brittle fracture.