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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of polyacrylate composite with thiol-modified nanosilica as chain transfer agent
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Synthesis and characterization of polyacrylate composite with thiol-modified nanosilica as chain transfer agent

机译：巯基改性纳米二氧化硅为链转移剂的聚丙烯酸酯复合材料的合成与表征

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Polyacrylate composites with thiol-modified nanosilica as chain transfer agent were prepared. The FTIR results indicated that the chemical bond has formed between polyacrylate and modified nanosilica. The change of molecular weight distribution proved that the thiol group on the nanosilica surface played the chain transfer agent role just as common thiol. A possible mechanism of modified nanosilica in the polymerization was proposed and the core-shell may be formed finally. In addition, the dispersion of nanosilica in the polyacrylate also improved as a result of the organic bridge structure between the nanosilica and polyacrylate. The thermal decomposition temperature increased as much as 10 degrees C for polyacrylate with 10 wt % modified nanosilica composites compared to polyacrylate. The coatings hardness increased from 2 to 6 H and the abrasion resistance improved from 28 to 10 mg under the same conditions. Especially, the gloss change of coatings with different content of modified nanosilica indicated that the polyacrylate composites have obviously better aging resistance performance compared to polyacrylate. It may be ascribed to the property that nanosilica can absorb large UV light. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42756.
机译：制备了以巯基改性的纳米二氧化硅为链转移剂的聚丙烯酸酯复合材料。 FTIR结果表明聚丙烯酸酯和改性纳米二氧化硅之间已形成化学键。分子量分布的变化证明，纳米二氧化硅表面的硫醇基团像普通硫醇一样起着链转移剂的作用。提出了改性纳米二氧化硅在聚合反应中的可能机理，最终可以形成核壳。另外，由于纳米二氧化硅和聚丙烯酸酯之间的有机桥结构，纳米二氧化硅在聚丙烯酸酯中的分散性也得到改善。与聚丙烯酸酯相比，具有10wt％的改性纳米二氧化硅复合材料的聚丙烯酸酯的热分解温度增加多达10℃。在相同条件下，涂层硬度从2 H增加到6 H，耐磨性从28 mg提高到10 mg。特别是，不同改性纳米二氧化硅含量的涂料的光泽度变化表明，聚丙烯酸酯复合材料比聚丙烯酸酯具有明显更好的耐老化性能。可以归因于纳米二氧化硅可以吸收大的紫外线的性质。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42756。

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