Crystal transformation and thermomechanical properties of poly(vinylidene fluoride)/clay nanocomposites
Crystal transformation and thermomechanical properties of poly(vinylidene fluoride)/clay nanocomposites
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DOI：
10.1002/pi.1692
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发表时间：
2005
影响因子：
3.2
通讯作者：
K. Pramoda;A. Mohamed;I. Phang;Tianxi Liu
中科院分区：
文献类型：
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作者：
K. Pramoda;A. Mohamed;I. Phang;Tianxi Liu
研究了熔融插层聚偏氟乙烯(PVDF)/粘土纳米复合材料的结晶转变和热机械性能。采用热重分析(TGA)和差示扫描量热法(DSC)研究了不同粘土浓度下PVDF及其纳米复合材料的热性能。粘土在聚偏氟乙烯中的掺入导致聚偏氟乙烯形成β形式的晶体。熔融行为的差示扫描量热法研究表明，纯聚偏氟乙烯中只存在α相的晶体，而纳米复合材料中同时存在α和β相的晶体。这一结论得到了傅立叶变换红外光谱(FTIR)和X射线衍射仪(XRD)的证实。动态力学分析(DMA)表明，在20-150°C的温度范围内，储能模数显著提高。热膨胀系数(CTE)随着粘土含量的增加而减小。版权所有(C)2004化学工业学会
The crystal transformation and thermomechanical properties of melt-intercalated poly(vinylidene fluoride) (PVDF)/clay nanocomposites are reported in this study. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to study the thermal properties of PVDF and its nanocomposites with various clay concentrations. The incorporation of clay in PVDF results in the formation of β-form crystals of PVDF. DSC study of melting behavior suggested the presence of only α-phase crystals in neat PVDF and both α- and β-phase crystals in the nanocomposite. This conclusion was corroborated by findings from Fourier-transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). Dynamic mechanical analysis (DMA) indicated significant improvements in storage modulus over a temperature range of 20–150 °C. The coefficient of thermal expansion (CTE) decreases with increasing clay loading. Copyright © 2004 Society of Chemical Industry