PLA/PHB/MWNTs复合材料力学性能研究
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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.
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.
引文
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[7]Kashiwagi T, Du F, Douglas J F, et al. Nanoparticle Networks Reduce the Flammability of Polymer Nanocomposites[J]. Nature Materials, 2005, 4(12):928-933.
[8]Kashiwagi T, Du F, Winey K I, et al. Flammability Properties of Polymer Nano composites with Single-walled Carbon Nanotubes:Effects of Nanotube Dispersion and Concentration[J]. Polymer, 2005, 46:471-481.
[9]董振峰,朱志国.碳纳米管/聚合物复合体系阻燃性能的研究进展[J].纺织学报,2009(03):30-35.
[2]COLEMAN J N, KHAN U, GUNKO Y K. Mechanical reinforcement of polymers using carbon nanotubes[J]. Adv Mater, 2006,18(6):689-706.
[3]MONIRUZZAMAN M, WINEY K I. Polymer nanocomposites containing carbon nanotubes[J]. Macro molecules, 2006,39(16):5 194-5 205.
[4]蓝小平.P(3HB-co-4HB)/PLA共混材料力学性能、热性能研究[J].塑料制造,2010,(6):17-23.
[5]王淑芳,郭天瑛,等.微生物合成的β-羟基丁酸酯与β-羟基己酸酯共聚物/聚乳酸共混材料(PHBHHx/PLA)的力学性能与生物降解性研究[J].离子交换与吸附,2006, 22(1):1-8.
[6]肖军华,曹有名,周彦豪.碳纳米管/聚合物复合材料的研究进展[J].中国塑料,2008,(9):78-82.
[7]Kashiwagi T, Du F, Douglas J F, et al. Nanoparticle Networks Reduce the Flammability of Polymer Nanocomposites[J]. Nature Materials, 2005, 4(12):928-933.
[8]Kashiwagi T, Du F, Winey K I, et al. Flammability Properties of Polymer Nano composites with Single-walled Carbon Nanotubes:Effects of Nanotube Dispersion and Concentration[J]. Polymer, 2005, 46:471-481.
[9]董振峰,朱志国.碳纳米管/聚合物复合体系阻燃性能的研究进展[J].纺织学报,2009(03):30-35.