针对聚对苯二甲酸-己二酸-丁二醇酯(PBAT)材料拉伸强度低的问题,通过物理共混法制备聚乳酸(PLA)增强的PBAT复合材料,研究了PLA用量对PBAT拉伸性能、微观相结构、热力学性能及化学组成的影响。进一步加入聚乙二醇400(PEG400)后,将复合材料制备成膜,并对薄膜拉伸性能和微观形貌进行研究。结果表明:随着PLA占比的提升,PBAT/PLA/CaCO3复合材料的拉伸强度先增加后减小,而其断裂伸长率减小;PEG400的加入虽然在一定程度上降低了PBAT/PLA/CaCO3复合材料的拉伸强度,但其提升了PBAT与PLA的相容性,故可显著提升复合材料的断裂伸长率;PLA含量为10%时,PBAT/PLA/CaCO3/PEG400复合材料的拉伸强度和断裂伸长率较纯PBAT分别提升了9.43%和6.94%,使其应用范围得到广泛扩展。
To solve the problem of low tensile strength of poly (butylene adipate-co-terephthalate) (PBAT),polylactic acid (PLA)-reinforced PBAT composites were prepared by melt blending.The effects of PLA content on the tensile properties,microphase structure,thermodynamic properties and chemical constitution of PBAT were studied.After the addition of polyethylene glycol 400 (PEG400),the composite materials were prepared into films,and the tensile properties and micro morphology of the films were further studied.The results showed that with the increase of PLA content,the tensile strength of PBAT/PLA/CaCO3 composites increased firstly and then decreased,and the elongation at break decreased.Although the addition of PEG400 reduced the tensile strength of PBAT/PLA/CaCO3 composites to a certain extent,it improved the compatibility between PBAT and PLA,so the elongation at break of the composites could be enhanced significantly.According to the experimental results,compared with pure PBAT,when PLA content was 10%,the tensile strength and elongation at break of PBAT/PLA/CaCO3/PEG400 composites were increased by 9.43% and 6.94%,respectively,widely expanding their application range.
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基金资助
河北省中央引导地方科技发展资金项目(236Z1205G);河北省重点研发计划项目(21371202D和22326411D)
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