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首页> 外文期刊>Journal of Materials Science >Epoxy modified with triblock copolymers: morphology, mechanical properties and fracture mechanisms
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Epoxy modified with triblock copolymers: morphology, mechanical properties and fracture mechanisms

机译：用三嵌段共聚物改性的环氧树脂：形貌，力学性能和断裂机理

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摘要

The morphology, fracture toughness and mechanical properties of an anhydride-cured diglycidylether of bisphenol-A epoxy polymer modified with poly(methyl methacrylate)-b-poly(butylacrylate)-b-poly(methyl methacrylate) (MAM) have been investigated. The addition of three different MAM triblock copolymers (M22N, M52N and M52) to the epoxy polymer gives two different microstructures. A nanostructure with well-dispersed worm-like micelles (or a bicontinuous gyroid structure if the micelles are connected into a network) was obtained using M22N. The addition of M52N or M52 gives dispersed micron-size particles in the epoxy matrix for ≤7 wt% MAM, and a co-continuous microstructure at higher MAM contents. These triblock copolymers toughen the epoxy polymer significantly, with only slight reductions in the mechanical and thermal properties of the epoxy polymer. The maximum values of fracture toughness and fracture energy (1.22 MPa m1/2 and 450 J/m2, respectively) were measured using 12 wt% M22N, which is an increase of 100 and 350%, respectively, compared with the unmodified epoxy. The M52- and M52N-modified materials show a maximum toughness when a co-continuous microstructure is formed. The potential toughening mechanisms are identified and discussed.
机译：研究了用聚（甲基丙烯酸甲酯）-b-聚（丙烯酸丁酯）-b-聚（甲基丙烯酸甲酯）（MAM）改性的双酚A环氧聚合物的酸酐固化二缩水甘油醚的形态，断裂韧性和力学性能。将三种不同的MAM三嵌段共聚物（M22N，M52N和M52）添加到环氧聚合物中可得到两种不同的微观结构。使用M22N获得了具有良好分散的蠕虫状胶束的纳米结构（如果胶束连接成网络，则为双连续螺旋状结构）。 M52N或M52的添加可在≤7 wt％的MAM中在环氧树脂基质中分散微米级的颗粒，并在较高的MAM含量下形成连续的微观结构。这些三嵌段共聚物显着增韧了环氧聚合物，而环氧聚合物的机械和热性能仅稍有下降。使用12 wt％的M22N测量断裂韧性和断裂能的最大值（分别为1.22 MPa m1 / 2 和450 J / m2 ），分别增加100％和350％ ，与未改性的环氧树脂相比。当形成共连续的微观结构时，M52和M52N改性材料显示出最大的韧性。确定并讨论了潜在的增韧机制。

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  • 来源
    《Journal of Materials Science》 |2012年第11期|p.4546-4560|共15页
  • 作者

    Jing Chen; Ambrose C. Taylor;

  • 作者单位

    Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;

    Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;

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