聚氨基酸修饰的纳米二氧化硅的制备及在尼龙改性中的应用
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山东省自然科学基金资助项目(ZR2016EMP03,ZR2016XJ004);高分子材料工程国家重点实验室开放课题(sklpme2016-4-32)


Preparation of Poly (amino acid) Modified Nano-Silica and Its Application in Nylon Modification
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    摘要:

    基于氨基酸单体和纳米SiO2 粒子结构和功能的多样性,采用聚氨基酸来修饰纳米SiO2 粒子的研究有很大的发展空间。文中先用St?ber法制备纳米SiO2 粒子,再用3-氨基丙基三乙氧基硅烷(APTS)对其进行表面改性;并合成谷氨酸苄脂N-羧基酸酐(BLG-NCA),采用“Graftingfrom”法将其接枝到改性后的纳米SiO2 粒子上,最后得到聚谷氨酸修饰的纳米SiO2 核壳粒子。随着投料比的增加,其接枝聚氨基酸的壳的厚度增加,粒子之间出现粘连。将尼龙6与SiO2 及改性后的SiO2 熔融共混,得到复合材料。用透射电子显微镜、核磁共振氢谱、傅里叶变换红外光谱、热重分析表征了各阶段产物和聚合物的组成,并对复合材料的力学性能进行测试。实验结果表明,聚氨基酸能改善尼龙6与SiO2 的相容性,加入纯SiO2 使复合材料性能降低3%,而加入接枝二氧化硅后尼龙6的力学性能随着接枝粒子壳的厚度增加而增加,接枝厚度最大的粒子使拉伸性能提高了5%。

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    Due to the diversity of structures and functions of amino acid monomers and nano-silica particles, there is still much room for development using polyamino acids to modify nano-silica particles. In this paper, silica nanoparticles were prepared by St?ber method and then surface-modified with 3-aminopropyltriethoxysilane (APTS). Glutamic acid benzyl ester N-carboxy anhydride (BLG-NCA) was synthesized, using "Grafting from" method grafted to the modified nano-silica particles, and finally got the polyglutamic acid modified nano-silica core shell particle, As the feed ratio increases, the thickness of the shell of the grafted polyamino acid increases, and adhesion occurs between the particles. The nylon 6 is melt blended with silica and the modified silica to obtain composites. The particle size and morphology of the silica nanoparticles and the modified particles were characterized by transmission electron microscopy (TEM). The structure and composition of the product at each stage were characterized by 1H-NMR, FT-IR and TGA. The mechanical properties of the composites were tested. The experimental results show that the polyamino acids can improve the compatibility of Nylon 6 and silica, the addition of pure SiO2 reduces the performance of the composite by 3%, and the mechanical properties of nylon 6 increase with the increase of shell thickness of the grafted particles after the addition of grafted silica. The maximum grafting thickness increases the tensile properties by 5%.

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董文杰,阚 泽.聚氨基酸修饰的纳米二氧化硅的制备及在尼龙改性中的应用[J].高分子材料科学与工程,2018,34(10):110-115.

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  • 在线发布日期: 2018-11-08
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