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GF/P(3HB-co-4HB)-PLA生物基复合材料的制备与性能

, PP. 112-117

Keywords: 聚(3-羟基丁酸酯-co-4-羟基丁酸酯),聚乳酸,玻璃纤维,力学性能,尺寸稳定性

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Abstract:

为了提高聚(3-羟基丁酸酯-co-4羟基丁酸酯)-聚乳酸(P(3HB-co-4HB)-PLA)生物基共混材料的力学性能和尺寸稳定性,扩大应用领域,以P(3HB-co-4HB)和PLA共混物为基体,盐酸或偶联剂表面处理的玻璃纤维(GF)为增强材料,采用熔融共混法制备GF/P(3HB-co-4HB)-PLA复合材料。通过傅里叶变换红外光谱仪(FTIR)、扫描电子显微镜(SEM)、热失重分析仪(TGA)和万能电子拉力机等研究了GF表面处理方法对复合材料力学性能、热性能、尺寸稳定性及断面形态的影响。研究结果表明:表面改性GF的加入可显著提高P(3HB-co-4HB)-PLA共混材料的综合性能。经偶联剂表面接枝的GF可均匀分散在P(3HB-co-4HB)-PLA基体中并形成较强的界面结合。添加质量分数20%的偶联剂改性GF使复合材料的拉伸强度、弯曲强度、缺口冲击强度和硬度分别提高了29.38%、20.32%、41.38%和15.31%;初始热分解温度(IDT)和维卡软化温度(VST)分别提高了6.64℃和10.7℃;室温和60℃放置60d后复合材料试样长度方向的尺寸稳定性分别提高了32.47%和33.70%。

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