Rheological behavior, morphology and mechanical property of poly(propylene carbonate)/thermoplastic oxidized starch composites

doi:10.11949/j.issn.0438-1157.20141682

Abstract

Abstract:

Maleic anhydride grafted poly(propylene carbonate) (PPCMA)/thermoplastic starch (TPS), PPCMA/thermoplastic oxidized starch (TPOS) and PPCMA/DL-TPOS (TPOS modified by aluminate coupling agent) composites were prepared by melt blending. Effects of starch oxidation and content of DL and DL-TPOS on rheological behavior, morphology and mechanical properties of composites were investigated. The results of Fourier Transform Infrared Spectroscopy (FTIR) revealed that the reinforcement in mechanical properties of PPC/starch composites was probably resulted from hydrogen-bonding interaction between carbonyl groups of PPC and hydroxyl groups of starch. The compatibility between PPCMA and TPOS was better than that of PPCMA and TPS. The mechanical property, storage modulus (G'), loss modulus (G'') and complex viscosity (η^*) of composites were improved by oxidation of starch. Moreover, the dispersion of TPOS in PPC matrix became better when starch was modified by DL, improving the tensile strength of composites. For PPCMA/DL-TPOS composites, the tensile strength increased by 460% from 2.45 MPa to 13.72 MPa, when DL-TPOS content was from 0 to 40% (mass), while it decreased when the loading of DL-TPOS was 50% (mass). In addition, G', G'' and η^* of composites was improved with increasing DL-TPOS content.

Key words: poly(propylene carbonate), thermoplastic oxidized starch, aluminate coupling agent, composites, mechanical property, rheological property

摘要：

采用熔融共混的方法制备了马来酸酐接枝聚碳酸亚丙酯(PPCMA)/热塑性淀粉(TPS)、PPCMA/热塑性氧化淀粉(TPOS)和PPCMA/ DL-TPOS(铝酸酯预处理的TPOS)复合材料,研究淀粉的氧化以及偶联剂的加入对PPC复合材料流变、形态和性能的影响。加入淀粉后的PPC复合材料拉伸强度有较大提高,红外光谱结果显示淀粉和PPCMA之间形成了氢键作用,这可能是力学性能提高的主要原因;热塑性氧化淀粉与PPCMA基材的界面相容性提高,PPCMA/TPOS复合材料的力学性能、储能模量、损耗模量和复数黏度均高于PPCMA/TPS复合材料;铝酸酯对TPOS的预处理促进了TPOS在PPCMA中的分散,提高了复合材料的拉伸强度,在PPCMA/DL-TPOS体系中,当DL-TPOS含量为40%(质量分数)时拉伸强度达到最大值,与PPCMA相比,提高了4.6倍。

关键词: 聚碳酸亚丙酯, 热塑性氧化淀粉, 铝酸酯, 复合材料, 力学性能, 流变性能

CLC Number:

TB324

JIANG Guo, XU Jinghuo, FENG Jian, HUANG Hanxiong, ZHANG Shuidong. Rheological behavior, morphology and mechanical property of poly(propylene carbonate)/thermoplastic oxidized starch composites[J]. CIESC Journal, 2015, 66(7): 2718-2724.

蒋果, 徐景活, 冯健, 黄汉雄, 张水洞. 聚碳酸亚丙酯/热塑性氧化淀粉的流变、形态和性能[J]. 化工学报, 2015, 66(7): 2718-2724.

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