School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK, 73019, USA.
Department of Biology, Birla Institute of Technology and Science, Pilani-Hyderabad Campus, Jawaharnagar, Shamirpet Mandal, Hyderabad 500078, Telangana, India.
J Nanosci Nanotechnol. 2019 Dec 1;19(12):8071-8077. doi: 10.1166/jnn.2019.16869.
The montmorillonite/poly(vinyl alcohol) (MMT/PVA) nanocomposites films were synthesized by aqueous dispersion of MMT clay to PVA solution at 70-75 °C for 4 h. The average thicknesses of the MMT/PVA films were 85-120 m. The amount of clay was varied between 0-5 wt%. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis revealed the coexistence of exfoliated and intercalated structure of MMT clay in PVA. The Raman analysis of 1 wt% MMT/PVA showed, increased peak intensity at 1146.5 cm, that is indicator of higher crystallinity compare to pure PVA. Dynamic mechanical analysis (DMA) of MMT/PVA nanocomposite films showed an increase in the storage modulus. The optimum value of storage modulus obtained was 8,752 MPa on dispersing 1.0 wt% MMT clay in the PVA yielding 20.0% increase in the storage modulus compare to the pure PVA films. Thermo-gravimetric, analysis (TGA) of the MMT/PVA nanocomposite films also showed the increase in the thermal stability with respect to pure PVA films. The 1.0 wt% MMT clay loading in PVA, improved the thermal stability of MMT/PVA to 325 °C compared to 250 °C for pure PVA.
蒙脱土/聚乙烯醇（MMT/PVA）纳米复合材料薄膜是通过将蒙脱土粘土分散在 70-75°C 的 PVA 溶液中 4 小时制得。MMT/PVA 薄膜的平均厚度为 85-120μm。粘土的用量在 0-5wt%之间变化。X 射线衍射（XRD）和扫描电子显微镜（SEM）分析表明，蒙脱土粘土在 PVA 中存在剥离和插层结构的共存。1wt%MMT/PVA 的 Raman 分析表明，在 1146.5cm 处的峰强度增加，这表明与纯 PVA 相比，结晶度更高。MMT/PVA 纳米复合材料薄膜的动态力学分析（DMA）显示存储模量增加。在 PVA 中分散 1.0wt%MMT 粘土时，获得的存储模量的最佳值为 8752MPa，与纯 PVA 薄膜相比，存储模量增加了 20.0%。MMT/PVA 纳米复合材料薄膜的热重分析（TGA）也表明，与纯 PVA 薄膜相比，热稳定性随 MMT/PVA 纳米复合材料的增加而增加。与纯 PVA 相比，1.0wt%MMT 粘土在 PVA 中的负载将 MMT/PVA 的热稳定性提高到 325°C。
