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Structure and Rheological Properties of Latex-Silica Nanocomposite Films: Stress-Strain Isotherms

机译:乳胶-二氧化硅纳米复合薄膜的结构和流变特性:应力-应变等温线

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摘要

A study of the rheological properties of silica-filled nanolatex films by means of uniaxial strain experiments is presented. The samples are made by evaporating the aqueous solvent of mixtures of colloidal silica and colloidal nanolatex, followed by film formation. The reinforcement effect due to the introduction of hard silica beads is investigated as a function of silica volume fraction F, pH in solution before film formation, and silica bead size. The stress-strain curves show that the material can be stretched up to high elongations l typically around four or more before rupture, indicating that the extensibility of the pure nanolatex film is conserved. It is found that the silica contributes differently at small and large deformations: In the small deformation regime (λ ≤ 1.2), considerable reinforcement (a factor of 10 in Young's modulus with respect to the pure nanolatex) is obtained with silica volume fractions of the order of 10%. At higher elongations, the reinforcement factor decreases, and the rheology of the nanocomposite samples approaches the one of the pure nanolatex films.
机译:提出了通过单轴应变实验研究二氧化硅填充的纳米胶乳薄膜的流变性能。通过蒸发胶体二氧化硅和胶体纳米胶乳的混合物的水性溶剂,然后形成膜来制备样品。研究了由于引入硬质硅珠而产生的增强效果与硅体积分数F,成膜前溶液中的pH值以及硅珠尺寸的关系。应力-应变曲线表明,在断裂之前,该材料通常可拉伸至大约4或更高的高伸长率,这表明纯纳米乳胶膜的可延展性得以保留。发现二氧化硅在小变形和大变形中的贡献不同:在小变形状态(λ≤1.2)中,二氧化硅的体积分数为5%(相对于纯纳米胶乳,杨氏模量的10倍)。 10%的订单。在较高的伸长率下,增强因子降低,并且纳米复合材料样品的流变性接近纯纳米乳胶膜之一。

著录项

  • 作者

    Oberdisse, Julian;

  • 作者单位
  • 年度 2002
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  • 原文格式 PDF
  • 正文语种 en
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