环氧树脂

Abstract(#br)We investigate in this work the formulation of composite resistive pastes based on epoxy resins and graphite for micro-heater manufacturing via thick-film technology. The resistive paste is first screen-printed onto a printed circuit board (PCB) substrate, and then coated with expandable polydimethylsiloxane (PDMS), a composite based on an elastomeric matrix and expandable microspheres, resulting into one-shot thermal actuators allowing pumping and sealing in microfluidic devices.

Abstract(#br)The superhydrophobic coatings with high gamma radiation stability were prepared by using epoxy/polydimethylsiloxane (EP/PDMS) resins as the matrix and silica nanoparticles as the fillers. The nanocomposite coatings exhibit superhydrophobicity with a high water contact angle (WCA) of 154° and a low sliding angle of 7°. With the amount of SiO 2 increasing from 0 to 30%, the surface shows the hierarchically structure gradually and its roughness raised from 4\u003cce:hsp sp=\"0.25\"/\u003enm to 278\u003cce:hsp sp=\"0.25\"/\u003enm.

Abstract(#br)Flexible and stretchable multifunctional electronics is expected to be one of the most active research areas in the next decade. In this work, we fabricate graphene based flexible film sensors using two different matrices; polydimethylsiloxane (PDMS) and epoxy. A graphene platelet (GnP) refers to a nanosheet that consists of a few stacked graphene layers, mostly below ~ 10 nm in thickness . The mechanical, electrical and thermal properties of the fabricated composite films were evaluated. The morphology showed a good dispersibility of GnPs into the PDMS and epoxy matrices.

AbstractThe preparation of highly compatible polydimethylsiloxane/epoxy system has been a challenging task. Here, we designed and synthesized a vinyl-containing bifunctional epoxy resin, which was chemically bonded with polydimethylsiloxane by hydrosilylation. A silicone-epoxy block hybrid network with restricted micromorphology and outstanding macro-performance was formed. The phase separation scale of polydimethylsiloxane/epoxy system was strictly restricted by molecular structure design and the modified PDMS was transparent.

摘要\n制备高相容性的聚二甲基硅氧烷/环氧体系一直是一项具有挑战性的任务。在此，我们设计合成了一种含乙烯基双功能环氧树脂，通过硅氢加成反应与聚二甲基硅氧烷发生化学键合。形成了微观形貌受限、宏观性能优异的硅-环氧嵌段杂化网络。聚二甲基硅氧烷/环氧体系的相分离尺度受到分子结构设计的严格限制，改性后的PDMS透明。力学性能测试结果表明，复合材料的拉伸强度、断裂伸长率和剪切强度分别提高了39.1 %、7.8 %和29.2 %。更为重要的是，杂化材料的初始热分解温度升高，800℃的热残馀量保持在较高水平。所有这些结果表明，我们制备了一种透明、高性能的聚二甲基硅氧烷材料，有望应用于耐热胶粘剂、透明表面涂层等诸多领域。

以端乙烯基聚硅氧烷( VS )和硅化环氧树脂( ES )为原料，通过一步制备法合成了高性能互穿聚合物网络( IPN )体系。聚硅氧烷与环氧的相容性因IPN结构而得到改善，动力学力学分析和扫描电镜证实了这一点。当VS：ES的质量比为100：20 (即20p - IPN )时，改性聚二甲基硅氧烷( PDMS )的力学性能和粘接性能均显著提高。例如，20p-IPN的拉伸强度和断裂伸长率分别为205 %和119.9 %，均高于纯PDMS。与纯PDMS对应物相比，20p-IPN的剪切强度也提高了一倍。热重分析表明，虽然改性环氧的加入使降解温度略有降低，但就10p-IPN而言，800  ℃的残渣仍保持在很高的水平( 56.3 % )。这些结果表明，我们提出的方法可以明显改善PDMS的性能，为高性能的工程应用展示了一个很有前景的方面。

通过光刻/胶体光刻制备了几种具有人工精细可控微/纳米分级结构的环氧热固性( ET )复合涂层，并将其应用于防腐领域。首先，通过常规光刻工艺制备了间距可控、微尺度圆柱结构宽度可控的硅片。随后，在先前硅片表面光滑洁净的表面用微尺度圆柱体制备纳米尖端，通过胶体光刻技术生成纳米尖端。此外，以聚二甲基硅氧烷( PDMS )为软负模板，采用纳米铸造技术复制ET涂层。对所制备的硬硅模板和ET涂层的表面形貌和接触角( CA )进行了鉴定。水滴在具有生物诱导微/纳米分级结构的ET涂层上的CA为160°，说明该涂层比具有独特表面结构的ET涂层具有更高的疏水性。对所制备的具有/不具有显著结构的ET涂层的防腐研究表明，对于短期和长期的研究，BET涂层的冷棒钢( CRS )电极比其他ET涂层具有更好的防腐性能。这种精细可控的微/纳米结构涂层工艺为进一步创新研究腐蚀防护方法和材料设计打开了大门。