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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%。
In order to improve the mechanical properties and dimensional stability of poly (3-hydroxybutyrate-co-4 hydroxybutyrate) -polylactic acid (P (3HB-co-4HB) -PLA) (3HB-co-4HB) and PLA blends were used as the matrix, and the glass fiber (GF) treated with hydrochloric acid or coupling agent was used as the reinforcing material. ) -PLA composite. The effects of GF surface treatment on the mechanical properties, thermal properties, dimensional stability and mechanical properties of the composites were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and universal electronic tensile tester Effect of cross section morphology. The results show that the addition of surface-modified GF can significantly improve the overall performance of P (3HB-co-4HB) -PLA blends. The GF grafted on the surface of the coupling agent can be uniformly dispersed in the P (3HB-co-4HB) -PLA matrix and form strong interfacial bonding. The tensile strength, flexural strength, notched impact strength and hardness of the composites were increased by 29.38%, 20.32%, 41.38% and 15.31%, respectively. The initial thermal decomposition temperature (IDT) And VST increased by 6.64 ℃ and 10.7 ℃, respectively. After 60 days at 60 ℃, the dimensional stability of the composite in the length direction increased by 32.47% and 33.70%, respectively.