Effect of acrylic copolymer and terpolymer composition on the properties of in-situ polymer/silica hybrid nanocomposites
Effect of acrylic copolymer and terpolymer composition on the properties of in-situ polymer/silica hybrid nanocomposites
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DOI：
10.1007/s10853-006-6576-x
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发表时间：
2006-02
影响因子：
4.5
通讯作者：
S. Patel;A. Bandyopadhyay;V. Vijayabaskar;A. Bhowmick
中科院分区：
文献类型：
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作者：
S. Patel;A. Bandyopadhyay;V. Vijayabaskar;A. Bhowmick
以丙烯酸乙酯（EA）、丙烯酸丁酯（BA）和丙烯酸（AA）为单体，采用溶胶-凝胶法合成了丙烯酸共聚物（AA）和5%丙烯酸（AA）改性的三元共聚物-SiO2杂化纳米复合材料。通过使用傅里叶变换红外（FTIR）光谱和固态核磁共振（NMR）光谱分析纯聚合物。通过扫描电子显微镜（SEM）、红外光谱、核磁共振谱、动态力学性能、力学性能和热性能等对杂化材料进行了表征。SEM图像证实了聚合物基质中纳米二氧化硅颗粒的存在，其分散性和粒度分布以及视觉外观取决于聚合物基质的相对极性（亲水性）和填料的浓度。没有证据表明聚合物和分散的二氧化硅相之间存在强烈的化学相互作用，如FTIR结果所证实的。三元共聚物-二氧化硅杂化物表现出比共聚物-二氧化硅杂化物优越的上级机械性能。它们还显示出更高的动态储能模量和损耗角正切峰的正位移。纳米复合材料的热稳定性略高，这可能是由于偶极相互作用在有机-无机界面。
Acrylic copolymer- and 5% acrylic acid (AA) modified terpolymer-silica hybrid nanocomposites were synthesized by free radical bulk polymerization of ethyl acrylate (EA), butyl acrylate (BA) and acrylic acid (AA) with simultaneous generation of silica from tetraethoxysilane by sol-gel reaction. The pure polymers were analyzed by using Fourier Transform infrared (FTIR) spectroscopy and solid state nuclear magnetic resonance (NMR) spectroscopy. The hybrid samples were characterized by scanning electron microscopy (SEM), FTIR spectroscopy, NMR spectroscopy, dynamic mechanical, mechanical and thermal properties. SEM images confirmed the presence of nanosilica particles within the polymer matrices, whose dispersion and particle size distribution and visual appearance were dependent on the relative polarity (hydrophilicity) of the polymer matrices and the concentration of the filler. There was no evidence of strong chemical interaction between the polymers and the dispersed silica phase, as confirmed from the FTIR results. Terpolymer-silica hybrids demonstrated superior mechanical properties compared to the copolymer-silica hybrids. They also showed higher dynamic storage modulus and positive shift in the loss tangent peaks. The thermal stability of the nanocomposites was marginally higher which was possibly due to the dipolar interaction at the organic-inorganic interface.