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首页> 外文期刊>RSC Advances >Electromagnetic radiation driving of volume changes in nanocomposites made of a thermosensitive hydrogel polymerized around conducting polymer nanoparticles
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Electromagnetic radiation driving of volume changes in nanocomposites made of a thermosensitive hydrogel polymerized around conducting polymer nanoparticles

机译：纳米复合材料的体积变化的电磁辐射驱动由聚合物纳米颗粒聚合的热敏水凝胶制成的纳米复合材料

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Polymeric nanocomposites were obtained by the formation of a thermosensitive hydrogel matrix around conducting polymer (CP) nanoparticles. The CP is able to absorb electromagnetic radiation which is converted into heat and induces the phase transition of the surrounding hydrogel. The method chosen to form the hydrogel is the free radical polymerization of a copolymer ( N -isopropylacrylamide (NIPAM) and 2-acrylamide-2-methylpropano sulfonic acid (AMPS), PNIPAM- co -2% AMPS) in the presence of bisacrylamide as the crosslinker. The nanoparticles are polypyrrole nanospheres (PPy NP), polyaniline nanofibers (PANI NF), and polyaniline nanospheres (PANI NP). The morphology of the composites was studied using SEM microscopy and the percentage composition of each material was evaluated by thermogravimetric analysis (TGA). The swelling equilibrium capacity and rate are clearly affected by the nanoparticle shape and nature. However, the nanocomposites LCST are similar to that of the matrix. Upon RF irradiation, the three nanocomposites increase the temperature and reach the LCST after 320 seconds of irradiation (320 kJ). Upon MW application, the local temperature reaches the LCST after only 30 s (21 kJ), resulting in a MW more effective than RF to drive the transition. These results demonstrate that the proposed materials are useful as a remotely driven actuator.
机译：通过在传导聚合物（CP）纳米粒子周围的热敏水凝胶基质形成聚合物纳米复合材料。 CP能够吸收电磁辐射，该电磁辐射转化为热量并诱导周围水凝胶的相变。选择水凝胶的方法是双丙烯酰胺存在的共聚物（N-丙基丙烯酰胺（NIPAM）和2-丙烯酰胺-2-甲基丙醇磺酸（AMPS），PNIPAM-2％AMPS的自由基聚合。交联剂。纳米粒子是聚吡咯纳米球（PPY NP），聚苯胺纳米纤维（PANI NF）和聚苯胺纳米球（PANI NP）。使用SEM显微镜研究复合材料的形态，通过热重分析（TGA）评估每种材料的百分比组成。膨胀平衡能力和速率明显受纳米粒子形状和性质的影响。然而，纳米复合材料LCST类似于基质的纳米复合材料。在RF照射时，三种纳米复合材料增加温度并在320秒照射后到达LCST（320kJ）。在MW应用时，局部温度仅在仅30秒（21 kJ）之后达到LCST，导致MW比RF更有效以驱动过渡。这些结果表明，所提出的材料可用作远程驱动的执行器。

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