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首页> 外文期刊>Polymers for advanced technologies >Polycarbonate/SiC nanocomposites-influence of nanoparticle dispersion on molecular mobility and gas transport
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Polycarbonate/SiC nanocomposites-influence of nanoparticle dispersion on molecular mobility and gas transport

机译：聚碳酸酯/ SiC纳米复合材料-纳米颗粒分散体对分子迁移率和气体传输的影响

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摘要

Plasma synthesized silicon carbide (SiC) nanoparticles were dispersed in dichloromethane/poly(bisphenol-A-carbonate) (PC) solutions by high power ultrasonification. Samples were then prepared by film casting under well adapted preparation conditions. The influence of the SiC nanoparticles on the molecular mobility of the PC is studied by dielectric relaxation spectroscopy. No effect on the cooperative segmental mobility (glass transition) was detected. But the relaxation region corresponding to localized fluctuations is strongly broadened and the activation energy is reduced with increasing nanoparticle concentration. The most significant change was observed in the relaxation region between α- and β-process. The gas transport properties of these nanocomposite films are characterized in terms of permeability, diffusivity and solubility. Results can be interpreted based on an altered local free volume distribution and a change of molecular mobility of the polymer matrix near the nanoparticle surface which is in agreement with the dielectric results. Concentration dependent CO{sub}2 permeation experiments reveal a significant reduction of plasticization effects in the nanocomposites compared to the pure PC.
机译：通过高功率超声处理，将等离子体合成的碳化硅（SiC）纳米颗粒分散在二氯甲烷/聚（双酚A-碳酸酯）（PC）溶液中。然后在适合的制备条件下通过流延膜制备样品。通过介电弛豫谱研究了SiC纳米颗粒对PC分子迁移率的影响。未检测到对节段运动性（玻璃化转变）的影响。但是，随着局部纳米粒子浓度的增加，与局部波动相对应的弛豫区域被大大拓宽，活化能降低。在α-和β-过程之间的弛豫区域中观察到最显着的变化。这些纳米复合膜的气体传输性质以渗透性，扩散性和溶解性为特征。可以基于改变的局部自由体积分布和纳米颗粒表面附近的聚合物基质的分子迁移率的变化来解释结果，这与介电结果一致。浓度依赖性的CO {sub} 2渗透实验表明，与纯PC相比，纳米复合材料的增塑作用显着降低。

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