Poly(propylene carbonate)(PPC) is a new thermoplastic biodegradable material.However, its poor thermal and mechanical properties prevent its application in many fields.In corporation the straw flour, a by-product of agricultural products, into PPC is expected to enhance the mechanical properties of PPC and at the same time to find a way to make comprehensive use of straw resources.Chlorided poly(propylene carbonate)(CPPC), which was prepared by chlorination of PPC, possesses good wetting and adhering abilities on the surface of nature fibers.In this study, the PPC/straw flour composites compatibilized with CPPC were prepared by melt blending.The composites are characterized by scanning electron microscopy(SEM), tensile test, dynamic mechanical analysis(DMA) and rotational rheometer, focusing on the effect of CPPC contents on the mechanical and rheological properties of the composites.The results indicate that the tensile strength is increased by 38% for the 70/30 mass ratio of PPC to straw flour composites when 1.8%(mass fraction) CPPC is added.Moreover, the viscosity of the composite decreases with the introduction of CPPC and the processing property is improved accordingly.As a consequence, CPPC as compatibilizer provides a new way to prepare high performance PPC/natural fiber composites.%聚丙撑碳酸酯(PPC)是一种新型热塑性生物降解材料,但其热性能及力学性能较差,应用受到限制. 以秸秆粉这种农作物副产品作为增强体改性PPC,既可以提高PPC的力学性能同时又可开发利用秸秆资源. 氯化聚丙撑碳酸酯(CPPC)是聚丙撑碳酸酯(PPC)经过氯化得到的,对天然纤维表面具有良好的浸润性和粘结性. 本文以CPPC为增容剂,通过熔融共混法制备了PPC/秸秆粉复合材料. 采用扫描电子显微镜(SEM)、拉伸实验、动态力学性能测试(DMA) 及转矩流变仪对复合材料的结构及性能进行了表征,重点考察了CPPC的添加量对复合材料力学和流变性能的影响. 结果表明,当CPPC质量分数为1.8%时,可使添加质量分数为30%秸秆粉的PPC复合材料拉伸强度提高38%,模量提高30%. 同时,CPPC的引入使复合材料的粘度下降,改善了PPC/秸秆粉复合材料的加工性能. 因此,作为增容剂的CPPC为制备高性能PPC/天然纤维复合材料提供了新的解决办法.
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