Improving the Creep Stability of High-Density Polyethylene with Acicular Titania Nanoparticles
Improving the Creep Stability of High-Density Polyethylene with Acicular Titania Nanoparticles
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DOI：
10.1002/app.29472
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发表时间：
2009-04-15
影响因子：
3
通讯作者：
Pegoretti, A.
中科院分区：
文献类型：
--
作者：
Bondioli, F.;Dorigato, A.;Pegoretti, A.
采用水热晶化法制备了平均尺寸为15×60 nm(2)的针状二氧化钛纳米粒子。用十八烷基硅烷对二氧化钛粒子进行表面官能化处理，得到亲有机表面。采用熔融共混法制备了高密度聚乙烯(HDPE)纳米复合材料，分别加入2%、3%和5%浓度的未经处理和表面功能化的纳米二氧化钛。准静态力学拉伸试验表明，弹性模量和屈服应力都略有增加，在高填料含量时，伴随着断裂应变的显著降低。纳米二氧化钛的引入大大降低了HDPE的蠕变柔度和蠕变速率，特别是在长加载时间下。未处理的纳米二氧化钛在降低蠕变柔度方面比功能化的纳米二氧化钛更有效。(C)2009年威利期刊公司J Appl Polym Sci 112：1045-1055,2009
Acicular titania nanoparticles with average dimensions of 15 x 60 nm(2) were produced by hydrothermal crystallization of TiOCl2. Titania particles were surface-functionalized with octadecylsilane to obtain an organophilic Surface. High-density polyethylene (HDPE) nanocomposites were prepared by melt compounding with 2, 3, and 5 vol % concentrations of untreated and surface-functionalized titania nanoparticles. Quasi-static mechanical tensile tests evidenced slight increments of both the elastic modulus and stress at yield, which were accompanied by a marked reduction of the strain at break at high filler contents. The introduction of titania nanoparticles induced a substantial reduction of the creep compliance of the HDPE matrix and of its creep rate, especially at long loading times. Untreated titania nanoparticles were more effective in reducing the creep compliance than the functionalized ones. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112:1045-1055,2009