Meera K, Ramesan M T
Centre for Polymer Science and Technology, Department of Chemistry, University of Calicut, Calicut University P.O., Malappuram, Kerala 673 635, India.
Centre for Polymer Science and Technology, Department of Chemistry, University of Calicut, Calicut University P.O., Malappuram, Kerala 673 635, India.
Int J Biol Macromol. 2024 Dec;282(Pt 3):137034. doi: 10.1016/j.ijbiomac.2024.137034. Epub 2024 Oct 28.
This study explores the eco-friendly synthesis of carboxymethyl chitosan/polyethylene oxide/γ-aluminium oxyhydroxide (CMCS/PEO/γ-AlOOH) nanocomposite films through a sustainable, green preparation method. The CMCS/PEO/γ-AlOOH nanocomposites were characterized through X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) to analyze their structural and morphological properties. The emergence of distinct peaks of γ-AlOOH in XRD and FTIR spectra indicated the strong interaction between γ-AlOOH and the blend. Morphological analysis revealed significant changes in the surface characteristics of the pristine blend upon incorporation of γ-AlOOH. Thermogravimteric analysis (TGA) confirmed the improved thermal stability of the nanocomposites, while differential scanning calorimetry (DSC) revealed changes in the glass transition temperature proportional to the γ-AlOOH content. The nanocomposite films demonstrated enhanced mechanical properties, exhibiting a 39.6 % increase in tensile strength at a 5 wt% γ-AlOOH loading. The temperature-dependent dielectric constant, loss tangent, AC conductivity and impedance were analyzed at varying loadings of γ-AlOOH. The 7 wt% γ-AlOOH nanocomposites showed the highest conductivity (1.23 × 10 S/cm at 1 MHz) and dielectric constant (244 at 100 Hz) at ambient temperature. The CMCS/PEO/γ-AlOOH nanocomposite's superior tensile strength, thermal stability, glass transition temperature, conductivity, and dielectric constant make it a strong candidate for eco-friendly, flexible electronic devices.
本研究通过一种可持续的绿色制备方法，探索了羧甲基壳聚糖/聚环氧乙烷/γ-羟基氧化铝（CMCS/PEO/γ-AlOOH）纳米复合薄膜的环保合成。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对CMCS/PEO/γ-AlOOH纳米复合材料进行了表征，以分析其结构和形态特性。XRD和FTIR光谱中γ-AlOOH独特峰的出现表明γ-AlOOH与共混物之间存在强相互作用。形态分析表明，加入γ-AlOOH后，原始共混物的表面特性发生了显著变化。热重分析（TGA）证实了纳米复合材料的热稳定性有所提高，而差示扫描量热法（DSC）则显示玻璃化转变温度的变化与γ-AlOOH含量成正比。纳米复合薄膜表现出增强的机械性能，在γ-AlOOH负载量为5 wt%时，拉伸强度提高了39.6%。在不同γ-AlOOH负载量下分析了温度依赖性介电常数、损耗角正切、交流电导率和阻抗。7 wt%的γ-AlOOH纳米复合材料在室温下显示出最高的电导率（1 MHz时为1.23×10 S/cm）和介电常数（100 Hz时为244）。CMCS/PEO/γ-AlOOH纳米复合材料优异的拉伸强度、热稳定性、玻璃化转变温度、电导率和介电常数使其成为环保柔性电子器件的有力候选材料。
