可生物降解聚碳酸亚丙酯/聚丙烯非织造布切片制备及其性能

采用熔融共混法制备可生物降解聚碳酸亚丙酯（PPC）/聚丙烯（PP）熔喷无纺布切片，研究原料比例、共混温度、共混时间、共混转速对PPC/PP切片力学性能的影响，并研究PPC与PP比例对PPC/PP切片熔体流动速率、特性粘度，热学性能、微观形貌、降解性能的影响。结果表明：原料比例对力学性能的影响最大，在原料质量比PPC:PP为7:3、共混温度为175℃，共混时间为5min、转速为35r?min-1制备的PPC/PP切片，拉伸强度为13.02MPa，熔体流动速率为3494 g?(10min)-1。原料质量比PPC:PP为6:4时，熔体流动速率为1563g?(10min)-1，符合熔喷无纺布要求。PPC/PP切片热分解温度比PPC有较大幅度的提高，说明PP的加入提高了PPC/PP切片的热稳定性；扫描电镜图显示质量比PPC：PP为7:3的PPC/PP切片存在较少的凹陷或空洞，相容性较好，在磷酸缓冲液中降解30d后降解率达3.62%。

Preparation and performance of biodegradable slice of poly (propylene carbonate) / polypropylene for nonwoven fabrics

The biodegradable meltblown non-woven fabric slice of poly (propylene carbonate)(PPC) / polypropylene(PP) was prepared by melt blending. The effect of the proportion of raw materials, blending temperature, blending time, blending speed on the mechanical properties of slice of poly (propylene carbonate)(PPC) / polypropylene(PP) was investigated, and melt flow rate, intrinsic viscosity, thermal properties, micro-morphology, degradation performance of different proportions of PPC/PP fabric slice also be investigated.The results shown that the influence of the proportion of raw materials for mechanical properties was significant, the tensile strength was 13.02MPa and the MFR was 3494g?(10min)-1 when the raw material ratio of PPC: PP was 7:3, blending temperature was 175℃, blending time was 5min, blending speed was 35r?min-1.The MFR was 1563g?(10min)-1 when the raw material ratio of PPC/PP was 6:4, it was accorded with meltblown non-woven fabric slice requirement. The thermal decomposition temperature of slices was improved more than PPC. It explained to the thermal stability can be impoved for adding the PP. The results of SEM shown that the slice of the ratio of PPC/PP was 7:3 was more smooth, had less depressions and cavities, the compatibility was better, and the degradation rate was 3.6198% in phosphoric acid buffer after a month.