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首页> 外文期刊>Polymer Composites >Processing, Dynamic Mechanical Thermal Analysis, and Dielectric Properties of Barium Titanate/Cellulosic Polymer Nanocomposites
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Processing, Dynamic Mechanical Thermal Analysis, and Dielectric Properties of Barium Titanate/Cellulosic Polymer Nanocomposites

机译：加工，动态机械热分析和钛酸钡/纤维素聚合物纳米复合材料的介电性能

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High dielectric constant BaTiO3/ethyl cellulose (BT/EC) nanocomposites having BT loadings of up to 13 vol% were fabricated through a simple casting technique. The BT filler powder, synthesized through an ultrasonicassisted solid-state route, was revealed by X-ray powder diffractometry (XRD) and Raman spectroscopy to be dominantly tetragonal. Scanning electron microscopy (SEM) showed good dispersion of the BT nanoparticles in the EC polymer matrix at lower BT concentrations. However, at higher concentrations, the BT particles form a continuous phase or a "filler network" leading to weak BT/EC interactions. This finding is well supported by the results of the tensile strength and storage modulus. The dielectric properties of the BT/EC nanocomposites were investigated over wide ranges of frequency and temperature. The addition of BT significantly increased the permittivity (epsilon ') and dielectric loss (epsilon '') and improved the ionic conductivity of the EC. The electric modulus (M '') results were analyzed in terms of the Havriliak-Negami function through three distinct relaxation mechanisms (namely a, beta*, and beta relaxations) in the temperature range 30-150 degrees C. The dc conductivity (sigma(dc)) results suggest that the BT/EC nanocomposites formed at low BT loading (up to 7.0 vol%) and a temperature of <= 60 degrees C are good candidates for antistatic applications while those formed at higher concentrations and temperatures are recommended for use in electrostatic dissipation applications. (C) 2015 Society of Plastics Engineers
机译：通过简单的铸造技术制造具有高达13体积％的BT载荷的高介电常数BATIO3 /乙基纤维素（BT / EC）纳米复合材料。通过超声波分配固态途径合成的BT填充粉末被X射线粉末衍射（XRD）和拉曼光谱透露，并呈显着四边形。扫描电子显微镜（SEM）显示BT纳米颗粒在较低的BT浓度下EC聚合物基质中的BT纳米颗粒的良好分散。然而，在较高的浓度下，BT颗粒形成连续相或“填充网络”，导致BT / EC相互作用的弱。这种发现得到了抗拉强度和储存模量的结果。在频率和温度范围内研究了BT / EC纳米复合材料的介电性质。添加BT显着提高了介电常数（ε'）和介电损耗（epsilon'）并改善了EC的离子电导率。电模量（M''）通过三个不同的弛豫机制（即，β*，β和β弛豫）在30-150℃下的三个不同的弛豫机制（即β*，β和β弛豫）方面进行了分析结果.DC电导率（Sigma （DC））结果表明，在低BT负载（高达7.0 Vol％）和温度下的Bt / EC纳米复合材料和<= 60摄氏度的温度是抗静电应用的良好候选，而在较高浓度和温度下形成的那些用于静电耗散应用。 （c）2015年塑料工程师协会

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