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PLA/PHB/MWNTs复合材料力学性能研究 预览

Study on mechanical properties of PLA/PHB/MWNTs composites
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摘要 采用浓硝酸酸化碳纳米管,并通过正硅酸乙酯在碳纳米管表面接枝大量羟基,然后通过加入硅烷偶联剂KH550,形成表面被包覆的碳纳米管;再以聚乳酸(PLA)为主体、聚β-羟基丁酸酯(PHB)为辅料、碳纳米管为增强体,采用哈克密炼机制备PLA/PHB/碳纳米管复合材料。通过红外吸收光谱、电镜扫描、微型燃烧量热计、毛细管流变仪、维卡软化温度测试仪等对复合材料进行表征。实验结果表明:碳纳米管表面上接枝了大量的官能团;加入弹性体PHB之后,材料的拉伸强度、冲击强度、断裂伸长率提高,静弯曲强度下降;再加入少量的碳纳米管之后,复合材料的拉伸强度、冲击强度和静弯曲强度都有很大的提升,断裂伸长率下降;加入PHB之后,体系的表观黏度更受剪切速率的影响;加入碳纳米管之后,体系的表观黏度增大,体系的热稳定性增强。 Carbon nanotubes were acidified with concentrated nitric acid, and a large amount of hydroxyl groups were grafted on the surface of carbon nanotubes by tetraethyl orthosilicate, and then the surface coated carbon nanotubes were formed by adding silane coupling agent KH550. Then, polylactic acid(PLA) was used as the main component, poly-β-hydroxybutyrate(PHB) was used as auxiliary material,and carbon nanotubes were used as reinforcement, the PLA/PHB/carbon nanotube composite material was prepared by using a Harker internal mixer. The composite materials were characterized by infrared absorption spectroscopy, scanning electron microscopy, micro-combustion calorimeter, capillary rheometer and Vicat softening temperature tester. The experimental results show that a large number of functional groups are grafted on the surface of the carbon nanotubes; After the addition of the elastomer PHB, the tensile strength,impact strength and elongation at break of the material increase, and the static bending strength decreases;After adding a small amount of carbon nanotubes, the tensile strength, impact strength and static bending strength of the composites are greatly improved, and the elongation at break is decreased; After the addition of PHB, the apparent viscosity of the bulk 7 is more affected by the shear rate; After the addition of carbon nanotubes, the apparent viscosity of the system increases and the thermal stability of the system enhances.
作者 康永 Kang Yong(Yulin Hanting Chemical Technology & Development Co. LTD., YuLin 718100, Shaanxi,China)
出处 《橡塑技术与装备》 CAS 2019年第1期1-8,共8页 China Rubber/Plastics Technology & Equipment
关键词 表面改性 表观黏度 力学性能 热稳定性 复合材料 surface modification apparent viscosity mechanical properties thermal stability composite materials
作者简介 康永(1981-),男,博士研究生,工程师,现从事复合材料研究工作。
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