Scholarlink

<p>This study investigates the influence of low concentrations (≤ 0.06 wt%) of graphene oxide (GO) as a nanofiller on the structural, optical, and electrical properties of hydroxypropyl methylcellulose (HPMC) and chitosan (Cs) polymer blend. FT-IR analysis reveals significant spectral changes due to GO addition, including the disappearance and/or shifting of some bands. The UV-visible spectroscopy shows enhanced optical properties with increasing GO content. The optical band gap energy (E<sub>g</sub>) decreases from 5.20&#xa0;eV to 4.10&#xa0;eV with increases in the GO contents, attributed to the formation of new electronic states in the polymer matrix. SEM images showed densely packed graphene oxide sheets with diverse shapes and sizes (35.31–57.23&#xa0;nm), reflecting the structural diversity. The average size of the sheets was about 46.26&#xa0;nm. The dielectric and impedance analyses highlight the enhancement of the electrical properties due to the addition of GO. The higher values of the dielectric constant and the increase of the relaxation times suggest the improvement of the charge carrier mobility and a decrease of the crystallinity in the blend structure. AC conductivity analysis further confirms higher ionic conductivity at elevated GO concentrations, driven by enhanced segmental motion, reduced blend chain cohesion, and the establishment of GO-conducting pathways. These results demonstrate that the addition of graphene oxide (GO) significantly improves the structural, optical, and electrical properties of HPMC/Cs polymer blends. The observed improvements are attributed to the modifications induced by GO in the electronic structure and intermolecular interactions within the polymer matrix.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancement of the structural and physical properties of HPMC/Cs blend by incorporation of Graphene nanoparticles

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月10日

查看全文
  • I. S. Elashmawi,
  • A. M. Abdelghany

摘要

This study investigates the influence of low concentrations (≤ 0.06 wt%) of graphene oxide (GO) as a nanofiller on the structural, optical, and electrical properties of hydroxypropyl methylcellulose (HPMC) and chitosan (Cs) polymer blend. FT-IR analysis reveals significant spectral changes due to GO addition, including the disappearance and/or shifting of some bands. The UV-visible spectroscopy shows enhanced optical properties with increasing GO content. The optical band gap energy (Eg) decreases from 5.20 eV to 4.10 eV with increases in the GO contents, attributed to the formation of new electronic states in the polymer matrix. SEM images showed densely packed graphene oxide sheets with diverse shapes and sizes (35.31–57.23 nm), reflecting the structural diversity. The average size of the sheets was about 46.26 nm. The dielectric and impedance analyses highlight the enhancement of the electrical properties due to the addition of GO. The higher values of the dielectric constant and the increase of the relaxation times suggest the improvement of the charge carrier mobility and a decrease of the crystallinity in the blend structure. AC conductivity analysis further confirms higher ionic conductivity at elevated GO concentrations, driven by enhanced segmental motion, reduced blend chain cohesion, and the establishment of GO-conducting pathways. These results demonstrate that the addition of graphene oxide (GO) significantly improves the structural, optical, and electrical properties of HPMC/Cs polymer blends. The observed improvements are attributed to the modifications induced by GO in the electronic structure and intermolecular interactions within the polymer matrix.