氯化聚丙撑碳酸酯增容聚丙撑碳酸酯/秸秆粉复合材料的制备及性能-Jiang Wei

摘要：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。

Abstract：Poly(propylene carbonate) (PPC) is a new type of thermoplastic biodegradable material, but its thermal and mechanical properties are poor, limiting its applications. Straw powder, an agricultural by-product, was used as a reinforcing filler to modify PPC, which can improve the mechanical properties of PPC while developing the utilization of straw resources. Chlorinated poly(propylene carbonate) (CPPC), obtained by chlorination of PPC, has good wettability and adhesion to natural fiber surfaces. In this study, CPPC was used as a compatibilizer and PPC/straw powder composites were prepared by melt blending. The structure and properties of the composites were characterized by scanning electron microscopy (SEM), tensile testing, dynamic mechanical analysis (DMA) and torque rheometry, focusing on the effects of CPPC content on the mechanical and rheological properties. The results show that when the CPPC mass fraction was 1.8%, the tensile strength of the PPC composite containing 30 wt% straw powder increased by 38% and the modulus increased by 30%. Meanwhile, the introduction of CPPC decreased the viscosity of the composites and improved the processability of PPC/straw powder composites. Therefore, CPPC as a compatibilizer provides a new solution for preparing high-performance PPC/natural fiber composites.

论文链接：https://doi.org/10.11944/j.issn.1000-0518.2017.07.16041