界面强度对生物基环氧树脂/粘土纳米复合材料热/力学性能的影响
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辽宁省教育厅2019 年度科学研究经费项目(LJ2019008);辽宁省教育厅2021 年科学研究经费面上项目(LJKZ0441)


Effect of Interfacial Strength on Thermal/Mechanical Properties of Bio-Based Epoxy Resin/Clay Nanocomposites
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    摘要:

    为了探究不同性质的改性粘土对生物基环氧树脂的增强作用,将2,4,6-三(二甲氨基甲基)苯酚(DMP-30)与2 倍摩尔比的溴代正丁烷(BB)反应,制备了保留部分叔胺基的有机改性剂(PPDMP30);再将DMP-30 酸化制备了叔胺基全部质子化的改性剂(CPDMP30)。分别用这2 种改性剂对原始粘土进行表面处理,得到了2 种性质不同的有机化粘土——PP-clay(反应型)和CP-clay(非反应型)。以这2 种粘土作为增强体,采用“粘土淤浆复合法”制备了2 种界面结合强度不同的腰果酚环氧树脂(NC514s)/粘土纳米复合材料。透射电子显微镜照片显示,PP-clay 和CP-clay 都以无规剥离的形式均匀地分散在基体中。拉伸测试结果表明,反应型PP-clay 因保留了能参与基体树脂固化反应的叔胺基团,在两相间构建起较强的界面作用力,使材料的拉伸强度提升了135%。而非反应型CP-clay 仅使材料的拉伸强度提升109%。动态力学热分析结果显示,反应型PP-clay对复合材料Tg的提升效果更明显。

    Abstract:

    In order to study the effect of organoclays on mechanical properties of bio- based epoxy/clay nanocomposites, a reactive organic modifier was synthesized via the reaction of bromobutane with 2,4,6- tris- (dimethylaminomethyl) phenol (DMP- 30) by controlling the mole ratio (2:1). And a non- reactive modifier, fully protonated DMP30 (CPDMP30), was prepared by the acidification of DMP-30. The two organic modifiers were used for the modification of pristine Na+-clay and the two different types of organoclay (reactive PP-clay and non-reactive CP-clay) were prepared. Bio-based epoxy/clay nanocomposites with different interfacial strength were synthesized by using the above two organoclays via the “clay- slurry compounding method”. X- ray diffraction (XRD) and transmission electron microscopy (TEM) images show that the two types of epoxy/clay nanocomposites have nearly the same highly exfoliated microstructure. The tensile test indicate that reactive PP- clay, which can build stronger interfacial strength by chemical reaction, leads to an increase in the tensile strength of the nanocomposites by 135% at 3% organoclay. By contrast, the non-reactive type of CP-clay results in only 109% increase in strength (at the same loading of organoclay). Dynamic mechanical analysis (DMA) show that the glass transition temperature (Tg) of the nanocomposites is marginally improved relative to neat epoxy resin. In comparison, PP- clay is more effective in enhancing Tg of nanocomposites than CP-clay.

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李 响,赵 鹏,张 英,陈 斌.界面强度对生物基环氧树脂/粘土纳米复合材料热/力学性能的影响[J].高分子材料科学与工程,2022,38(7):45-52.

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  • 在线发布日期: 2022-09-26
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