GF/P(3HB-co-4HB)-PLA生物基复合材料的制备与性能

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60 d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%。

Preparation and properties of GF/P(3HB-co-4HB)-PLA bio-based composites

P(3HB-co-4HB)-PLA blend and glass fiber(GF) treated by hydrochloric acid or coupling agent were selected as the matrix and the reinforced material respectively to prepare GF/P(3HB-co-4HB)-PLA composites via melt blending in order to improve its mechanical properties and dimensional stability and enlarge its application fields. Fourier transform infrared spectroscopy(FTIR), scanning electron microscope(SEM), thermo gravimetric analyzer(TGA) and universal testing instrument etc. were used to investigate the influence of the surface treatment methods of GF on the mechanical and thermal properties, dimensional stability and fracture surface of the composites. The results show that the comprehensive properties of P(3HB-co-4HB)-PLA blends have been enhanced obviously by adding the surface-modified GF. The GF surface grafted with coupling agent can be homodispersed in the P(3HB-co-4HB)-PLA matrix to obtain better interfacial bonding. The tensile strength, flexural strength, notched impact strength and hardness of the composites with 20%(mass fraction) of GF modified by coupling agent increase by 29.38%, 20.32%, 41.38% and 15.31% respectively. The initial decomposition temperature(IDT) and vicat softening temperature(VST) of the composites increase by 6.64 ℃ and 10.7 ℃ respectively. The dimensional stability of the composites in the length direction increase by 32.47% and 33.70% respectively at room temperature or 60 ℃ for 60 d.