Synthesis and Properties of Carbon Nanotube-Grafted Silica Nanoarchitecture-Reinforced Poly(Lactic Acid).
Synthesis and Properties of Carbon Nanotube-Grafted Silica Nanoarchitecture-Reinforced Poly(Lactic Acid).
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DOI：
10.3390/ma10070829
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发表时间：
2017-07-19
期刊：
影响因子：
--
通讯作者：
Su CC
中科院分区：
文献类型：
--
作者：
Hsu YW;Wu CC;Wu SM;Su CC
以多壁碳纳米管（MWCNT）接枝二氧化硅纳米杂化物为增强体，制备了一种新型纳米结构增强聚乳酸（PLA）纳米复合材料。通过溶胶-凝胶法在多壁碳纳米管表面生成二氧化硅纳米粒子，合成了多壁碳纳米管接枝二氧化硅纳米杂化材料。这种合成方法涉及分散在四氢呋喃中的有机改性的多壁碳纳米管，该四氢呋喃包含经历超声溶胶-凝胶过程的四乙氧基硅烷。甘精胰岛素产生高度分散的二氧化硅上的有机改性的多壁碳纳米管。利用29 Si核磁共振、拉曼光谱、广角X射线衍射、热重分析和透射电子显微镜研究了纳米杂化材料的结构和性能。所得的多壁碳纳米管纳米结构共价组装成二氧化硅纳米粒子，表现出特定的和可控的形态，并用于增强可生物降解的聚乳酸。当将MWCNT接枝的二氧化硅应用于PLA基体时，PLA/MWCNT接枝的二氧化硅纳米复合材料的拉伸强度和热挠曲温度（HDT）增加;相反，PLA/MWCNT接枝的二氧化硅纳米复合材料的表面电阻率随着PLA基体中MWCNT接枝的二氧化硅的量增加而出现下降。总的来说，使用MWCNT接枝的二氧化硅纳米结构增强PLA是有效的，并且改善了其机械性能、耐热性和电阻率。
A novel nanoarchitecture-reinforced poly(lactic acid) (PLA) nanocomposite was prepared using multi-walled carbon nanotube (MWCNT)-grafted silica nanohybrids as reinforcements. MWCNT-grafted silica nanohybrids were synthesized by the generation of silica nanoparticles on the MWCNT surface through the sol-gel technique. This synthetic method involves organo-modified MWCNTs that are dispersed in tetrahydrofuran, which incorporates tetraethoxysilane that undergoes an ultrasonic sol-gel process. Gelation yielded highly dispersed silica on the organo-modified MWCNTs. The structure and properties of the nanohybrids were established using 29Si nuclear magnetic resonance, Raman spectroscopy, wide-angle X-ray diffraction, thermogravimetric analysis, and transmission electron microscopy. The resulting MWCNT nanoarchitectures were covalently assembled into silica nanoparticles, which exhibited specific and controllable morphologies and were used to reinforce biodegradable PLA. The tensile strength and the heat deflection temperature (HDT) of the PLA/MWCNT-grafted silica nanocomposites increased when the MWCNT-grafted silica was applied to the PLA matrix; by contrast, the surface resistivity of the PLA/MWCNT-grafted silica nanocomposites appeared to decline as the amount of MWCNT-grafted silica in the PLA matrix increased. Overall, the reinforcement of PLA using MWCNT-grafted silica nanoarchitectures was efficient and improved its mechanical properties, heat resistance, and electrical resistivity.
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