高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (10): 2024.doi: 10.7503/cjcu20150555

• 高分子化学 • 上一篇    下一篇

二氧化钛纳米棒/二氧化硅核壳粒子的制备及在聚乳酸中的应用

李根1, 王锐1, 王峰2, 梁宁宁1, 朱志国1, 张秀芹1(), 阳明书2   

  1. 1. 北京服装学院材料科学与工程学院, 北京 100029
    2. 中国科学院化学研究所工程塑料重点实验室, 北京 100190
  • 收稿日期:2015-07-17 出版日期:2015-10-10 发布日期:2015-09-14
  • 作者简介:联系人简介: 张秀芹, 女, 博士, 教授, 主要从事高分子材料的结构与性能研究. E-mail:clyzxq@bift.edu.cn
  • 基金资助:
    新世纪优秀人才计划项目(批准号: NCET120601)、 北京市教委重点基金(批准号: KZ201310012014)、 科技北京百名领军人才(批准号: LJ201305)和北京服装学院研究生科研创新项目(批准号: X2015069)资助

Preparation and Characterization of TiO2 Nanorods/SiO2@TiO2 Core Shell Particles and Its Application in PLLA

LI Gen1, WANG Rui1, WANG Feng2, LIANG Ningning1, ZHU Zhiguo1, ZHANG Xiuqin1,*(), YANG Mingshu2   

  1. 1. Department of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
    2. Key Laboratory of Engineering Plastic, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2015-07-17 Online:2015-10-10 Published:2015-09-14
  • Contact: ZHANG Xiuqin E-mail:clyzxq@bift.edu.cn
  • Supported by:
    † Supported by the Program for New Century Excellent Talents in University, China(No;NCET120601) and the Beijing Municipal Natural Science Foundation, China(No;KZ201310012014) and the Beijing Training Project for the Leading Talents in S & T(No;LJ201305) and the Research and Innovation Project for Graduate Students of Beijing Institute of Fashion Technology, China(No;BIFT-X2015069)

摘要:

以三氯化钛为钛源合成了纯金红石型TiO2纳米棒, 用正硅酸乙酯对纳米TiO2表面进行修饰, 得到SiO2为壳, TiO2为核的纳米粒子(SiO2@TiO2), TiO2纳米棒的平均长度约为50 nm, 平均直径约为8 nm, SiO2包覆层的厚度约为4 nm, SiO2@TiO2的最大吸收波长较TiO2的最大吸收波长存在微弱蓝移. 采用熔融共混法制备聚左旋乳酸(PLLA)/(SiO2@TiO2)纳米复合材料. 采用透射电子显微镜(TEM)、 热失重分析(TGA)、 差示扫描量热分析(DSC)、 紫外-可见吸收光谱(UV-Vis)和二维广角X射线散射(2D-WAXS)等研究了SiO2@TiO2的加入对PLLA耐热性能、 结晶性能、 紫外线屏蔽性能及拉伸性能的影响. 结果表明, SiO2@TiO2在PLLA基体中分散较好, SiO2@TiO2提高了PLLA的热分解温度, 具有异相成核的作用. PLLA/(SiO2@TiO2)纳米复合材料薄膜在保持较高可见光透过率的同时具有优异的紫外线屏蔽性能. SiO2@TiO2的加入使PLLA在较高温度下拉伸时能够获得更高的结晶度和取向度.

关键词: 聚左旋乳酸, 纳米二氧化钛, 复合材料, 拉伸性能

Abstract:

Rutile-type titanium dioxide(TiO2) nanorods were synthesized using titanium trichloride as titanium source, which were further superficially modified by tetraethoxysilane and the nano-TiO2 coated by SiO2 were obtained(SiO2@TiO2). The average length of TiO2 nanorods is about 50 nm, the average diameter of TiO2 nanorods is about 8 nm and the thickness of the SiO2 coating layer is about 4 nm. The maximum absorption wavelength of SiO2@TiO2 has a slight blue shift compared with that of TiO2. Poly(L-lactic acid)(PLLA)/(SiO2@TiO2) nanocomposites were prepared by melt blending. The thermal, crystallization, UV-shielding and stretching properties of PLLA and PLLA/(SiO2@TiO2) nanocomposites were characterized by transmission electron microscope(TEM), thermogravimetric analysis(TGA), differential scanning calorimetry analysis(DSC), ultraviolet-visible absorption spectrometry(UV-Vis) and wide angle X-ray scattering(2D-WAXS). The results showed that the SiO2@TiO2 nanoparticles were dispersed well in the PLLA matrix. SiO2@TiO2 improved the thermal decomposition temperature and crystallization rate of PLLA and had a heterogeneous nucleation role in PLLA. The PLLA/(SiO2@TiO2) films had excellent UV shielding property while maintaining high visible transmittance. The orientation and crystallinity of PLLA/(SiO2@TiO2) nanocomposites stretched at 90 and 100 ℃ were higher than that of PLLA.

Key words: Poly(L-lactic acid), Nano titanium dioxide, Composite, Stretching property

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