PBS／纳米SiO2改性聚乳酸

Research on the Modification of PLA/PBS/Nano SiO_2

为了提高聚乳酸(PLA)的综合性能,采用聚丁二酸丁二酯(PBS)、经过改性的纳米SiO_2对PLA进行共混改性。并通过γ―氨丙基三乙氧基硅烷(TPA)对纳米SiO_2进行表面改性。然后采用物理共混法,以PBS、改性后的纳米SiO_2为改性剂,聚乙烯蜡(PEW)为润滑剂,聚乙二醇(PEG)为增塑剂改性PLA,对改性后共混物的耐热性、力学性能和流变性能进行分析。结果表明,改性的纳米SiO_2加入量为1.5份时,PLA的综合力学性能最好,其拉伸强度为62.2MPa,冲击强度为14.2 kJ/m^2。PBS和纳米SiO_2的加入并未使PLA复合物的热性能和加工性能降低,反而使PLA复合物的熔点略有升高,其平衡转矩均在10 N·m左右。

In order to improve the comprehensive property of poly（lactic acid）（PLA） , polybutylene succinate （PBS） and modified nano-SiO2were used to mix with PLA. The nano-SiO2 was modified by 3-triethoxysilyl-l-propanamine （TPA） , in order to prepare the nano-SiO2 with good dispensability. Then modified nano-SiOz and polybutylene succinate （PBS） was used as modifier, paraffin was used as a lubrication gent, polyethylene glycol （PEG） as a plasticizer to modify PLA by means of melt-blending. The heat resistance and mechanical properties of the modified PLA were measured by inferential scanning calorimetry （DSC） and electronic universal testing machine. The mechanical performance test showed that when the nano-SiO2 modified by TPA added in an amount of 1.5 g, the tensile strength of the composite had the best tensile strength of 52.2 MPa, impact strength of the composite material was 14. 2 kJ/m^2. The mechanical tests showed that the mechanical properties of the PLA matrix enhanced with the incorporation of nano-SiO2 would＇t be without decreasing heat resistance and processability, but melting temperature of the modified PLA was increased and the torque values were around 10 N·m.