有机/无机混合复合材料来自立方丝二氧化
1Department of Materials Science and Engineering, H.H. Dow Building, University of Michigan, Ann Arbor, Michigan 48109-2136, USA.
Journal of the American Chemical Society
|November 15, 2001
概括
新的环氧纳米复合材料是使用八基 ((glycidyldimethylsiloxy) octasilsesquioxane (OG) 和二二甲 (DDM) 开发的. 与传统的环氧树脂相比,这些材料具有调节性质和增强的热稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 纳米技术 纳米技术
背景情况:
- 环氧树脂是广泛使用的聚合物,具有多功能应用.
- 开发具有控制结构的先进环氧纳米复合材料对于增强材料性能至关重要.
- 现有的环氧系统往往缺乏精确定义的有机/无机接口.
研究的目的:
- 合成和描述一种具有定义有机/无机相的新型环氧纳米复合材料.
- 研究组成比率和固化条件对纳米结构和机械性能的影响.
- 为了比较这些新的纳米复合材料与商业环氧树脂的性能.
主要方法:
- 通过与二氨基二甲 (DDM) 反应八{glycidyldimethylsiloxy) 八二二 (OG) 合成环氧纳米复合材料.
- 里埃变换红外光谱 (FTIR) 用于监测固化和结构完整性.
- 动态机械分析 (DMA) 和拉伸试验用于评估机械性能.
- 在HF消化后进行高性能凝透色谱 (GPC),以分析网络结构.
主要成果:
- 在固化过程中,丝素结构保持完整.
- 该OG/DDM复合材料表现出与DGEBA/DDM相比较的拉力模块和断裂性,具有优越的热稳定性.
- 在特定的组成比率 (N=0.5) 中观察到最大交叉链密度,而在不同的比率 (N=1.0) 中实现最佳机械性能.
- 分析揭示了与组成比率相关的独特的有机连接架构 (四个立方体与线性连接).
结论:
- 精确定义的环氧纳米复合材料与可控制的有机架构可以成功合成.
- 开发的纳米复合材料为传统环氧树脂提供了有希望的替代品,具有可调节的机械和热性能.
- 了解网络结构和构成之间的关系是设计高性能材料的关键.
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