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 Oct;277(Pt 4):134473. doi: 10.1016/j.ijbiomac.2024.134473. Epub 2024 Aug 5.
Conducting biopolymer blend nanocomposites of cashew gum (CG) and polypyrrole (PPy), with varying concentrations of copper oxide (CuO) nanoparticles were synthesized through an in-situ polymerization method using water as a sustainable solvent. The formation of blend nanocomposites was characterized using UV-visible (UV-vis) spectroscopy, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). UV spectroscopy revealed a significant reduction in absorption intensity with the addition of CuO, indicating enhanced optical properties. FT-IR and XRD analysis confirmed the successful incorporation of CuO into the CG/PPy blend. FE-SEM images revealed the uniform distribution of nanoparticles throughout the biopolymer blend, particularly in the 7 wt% sample. TGA and DSC results demonstrated a significant enhancement in thermal stability, increasing from 352 °C to 412 °C and a rise in the glass transition temperature from 89 °C to 106 °C in the blend nanocomposites. The dielectric constant, dielectric loss, impedance, Nyquist plot, electrical conductivity, and electric modulus were extensively examined at different temperatures and frequencies. The dielectric constant of the CG/PPy blend increased from 2720 to 92,950 with the addition of 7 wt% CuO, measured at 100 Hz. The improved glass transition temperature, thermal stability, and superior electrical properties imply potential usage of the developed nanocomposite in nanoelectronics and energy storage applications.
采用水作为可持续溶剂，通过原位聚合方法合成了腰果胶（CG）和聚吡咯（PPy）的生物聚合物共混纳米复合材料，并加入了不同浓度的氧化铜（CuO）纳米粒子。通过紫外-可见（UV-vis）光谱、傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）和场发射扫描电子显微镜（FE-SEM）对共混纳米复合材料的形成进行了表征。紫外光谱显示，随着 CuO 的加入，吸收强度显著降低，表明光学性能得到了增强。FT-IR 和 XRD 分析证实了 CuO 成功地掺入 CG/PPy 共混物中。FE-SEM 图像显示纳米粒子在整个生物聚合物共混物中均匀分布，特别是在 7 wt%的样品中。TGA 和 DSC 结果表明，热稳定性显著提高，从 352°C 提高到 412°C，玻璃化转变温度从 89°C提高到 106°C。在不同温度和频率下，广泛研究了介电常数、介电损耗、阻抗、奈奎斯特图、电导率和电模量。在 100 Hz 下，添加 7 wt% CuO 后，CG/PPy 共混物的介电常数从 2720 增加到 92950。提高的玻璃化转变温度、热稳定性和优异的电性能意味着所开发的纳米复合材料在纳米电子学和储能应用中具有潜在的用途。
