量热法

Novel silicone-based nanocomposites with varied elastic properties were prepared by blending standard polydimethylsiloxane (PDMS) with a lower viscosity component (hydroxyl-terminated PDMS) and integrating a graphene nanoplatelets (GNP) filler modified by strands of deoxyribonucleic acid (DNA). The curing behavior of these nanocomposites was studied by dynamic and isothermal differential scanning calorimetry.

将标准聚二甲基硅氧烷( PDMS )与低黏度组分(端羟基PDMS )共混，并与脱氧核糖核酸( DNA )链修饰的石墨烯纳米片( GNP )填料复合，制备了具有不同弹性性能的新型有机硅基纳米复合材料。采用Kissinger法和Ozawa-Flynn- Wall和Kissinger-Akahira- Sunose两种无模型等转化率方法测定了聚合反应的活化能。结果表明，采用等转化率方法可以描述固化行为的复杂趋势，对于含有标准PDMS基体的纳米复合材料，其活化能较低。同时也证明了石墨烯的DNA修饰对固化行为的作用。GNP-DNA填料的存在有利于纳米复合材料与PDMS基体的固化反应。PDMS / PDMS-OH共混物生成了硬度更软、弹性模量更低的纳米复合材料，可以通过改变填料的用量来调节。