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首页> 美国卫生研究院文献>Materials >Synthesis and Characterization of Encapsulated Nanosilica Particles with an Acrylic Copolymer by in Situ Emulsion Polymerization Using Thermoresponsive Nonionic Surfactant
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Synthesis and Characterization of Encapsulated Nanosilica Particles with an Acrylic Copolymer by in Situ Emulsion Polymerization Using Thermoresponsive Nonionic Surfactant

机译：热敏性非离子表面活性剂的原位乳液聚合法合成丙烯酸酯包覆的纳米丙烯酸颗粒及其表征

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Nanocomposites of encapsulated silica nanoparticles were prepared by in situ emulsion polymerization of acrylate monomers. The synthesized material showed good uniformity and dispersion of the inorganic components in the base polymer, which enhances the properties of the nanocomposite material. A nonionic surfactant with lower critical solution temperature (LCST) was used to encapsulate the silica nanoparticles in the acrylic copolymer matrix. This in situ method combined the surface modification and the encapsulation in a single pot, which greatly simplified the process compared with other conventional methods requiring separate processing steps. The morphology of the encapsulated nanosilica particles was investigated by dynamic light scattering (DLS) and transmission electron microscopy (TEM), which confirmed the uniform distribution of the nanoparticles without any agglomerations. A neat copolymer was also prepared as a control sample. Both the neat copolymer and the prepared nanocomposite were characterized by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analyses (TGA), dynamic mechanical thermal analysis (DMTA) and the flame resistance test. Due to the uniform dispersion of the non-agglomerated nanoparticles in the matrix of the polymer, TGA and flame resistance test results showed remarkably improved thermal stability. Furthermore, DMTA results demonstrated an enhanced storage modulus of the nanocomposite samples compared with that of the neat copolymer, indicating its superior mechanical properties.
机译：通过丙烯酸酯单体的原位乳液聚合制备包封的二氧化硅纳米颗粒的纳米复合材料。合成的材料显示出良好的均匀性和无机组分在基础聚合物中的分散性，这增强了纳米复合材料的性能。使用具有较低临界溶液温度（LCST）的非离子表面活性剂将二氧化硅纳米颗粒封装在丙烯酸共聚物基质中。这种原位方法将表面修饰和封装结合在一个罐中，与其他需要单独处理步骤的常规方法相比，极大地简化了工艺。通过动态光散射（DLS）和透射电子显微镜（TEM）研究了包封的纳米二氧化硅颗粒的形貌，这证实了纳米颗粒的均匀分布而没有任何团聚。还制备了纯共聚物作为对照样品。通过傅立叶变换红外光谱（FTIR），热重分析（TGA），动态机械热分析（DMTA）和阻燃性测试对纯共聚物和制备的纳米复合材料进行了表征。由于未团聚的纳米颗粒在聚合物基质中的均匀分散，TGA和阻燃性测试结果显示出显着改善的热稳定性。此外，DMTA结果表明，与纯共聚物相比，纳米复合材料样品的储能模量提高，表明其优异的机械性能。

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