College of Chemistry & Molecular Sciences, Wuhan University, Wuhan, 430072, People's Republic of China.
College of Chemistry & Molecular Sciences, Wuhan University, Wuhan, 430072, People's Republic of China; Research Institute of Shenzhen, Wuhan University, Shenzhen, 518057, People's Republic of China.
Carbohydr Polym. 2018 Nov 1;199:473-481. doi: 10.1016/j.carbpol.2018.07.034. Epub 2018 Jul 20.
Nanocellulose is a promising candidate as a "green" reinforcing nanofiller for polymer nanocomposites. Three-dimensionally nanoporous cellulose gels (NCGs) have been demonstrated to exhibit significant dispersibility and compatibilization with hydrophobic polymers. We report a simple and versatile process for the fabrication of NCG/polystyrene (PS) nanocomposites by the in situ free radical polymerization of styrene monomers within the NCG. The volume fraction of the NCG in the NCG/PS nanocomposites could be controlled from 10% to 60%. The interconnected nanofibrillar cellulose networks of the NCG were finely distributed and well preserved in the PS matrix after polymerization. Dynamic mechanical analysis revealed a remarkable reinforcement in the tensile storage modulus of the NCG/PS nanocomposites, especially above the glass transition temperature (T) of the PS matrix. The modified percolation model was in good agreement with the mechanical properties of the NCG/PS nanocomposites. The introduction of the NCG into the PS matrix significantly improved the flexural and tension properties of the NCG/PS nanocomposites.
纳米纤维素是一种很有前途的“绿色”增强型纳米填料，可用于聚合物纳米复合材料。三维纳米多孔纤维素凝胶（NCG）已被证明具有良好的疏水性聚合物分散性和相容性。我们报告了一种简单而通用的方法，通过苯乙烯单体在 NCG 内的原位自由基聚合来制备 NCG/聚苯乙烯（PS）纳米复合材料。NCG/PS 纳米复合材料中 NCG 的体积分数可以从 10%控制到 60%。聚合后，NCG 的互联纳米纤维纤维素网络在 PS 基质中得到精细分布和良好保留。动态力学分析显示，NCG/PS 纳米复合材料的拉伸储能模量得到了显著增强，特别是在 PS 基体的玻璃化转变温度（Tg）以上。改进的渗流模型与 NCG/PS 纳米复合材料的力学性能吻合较好。将 NCG 引入 PS 基体显著提高了 NCG/PS 纳米复合材料的弯曲和拉伸性能。
