Liu Zhao, Chen Panpan, Jin Xiao, Wang Li-Min, Liu Ying Dan, Choi Hyoung Jin
State Key Lab of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China.
Department of Polymer Science and Engineering, Inha University, Incheon 402751, Korea.
Polymers (Basel). 2018 Aug 4;10(8):867. doi: 10.3390/polym10080867.
As a natural polymer with abundant sources, cellulose was one of the earliest applied electrorheological (ER) materials. However, cellulose-based ER materials have not attracted much attention because of their relatively low ER effect and sensitivity to water. In this study, cellulose rods were decorated with a urea-terminated silane, 1-(3-(trimethoxysilyl) propyl) urea, after being swelled in sodium hydroxide solution. The morphologies and structures of the cellulose particles were investigated using scanning electron microscopy, Fourier-transform infrared spectroscopy and X-ray diffraction, confirming the dramatic differences of the treated cellulose particles from the pristine cellulose. Rheological behaviors of the pristine and modified cellulose particles in silicone oil were observed using a rotational rheometer. It was found that the silane-modified cellulose showed higher ER effect and higher dielectric properties than the pristine cellulose particles, which was not only related to the grafted polar molecules but may also be associated with the porous morphologies of the treated cellulose particles.
作为一种来源丰富的天然聚合物，纤维素是最早应用的电流变（ER）材料之一。然而，基于纤维素的电流变材料由于其相对较低的电流变效应和对水的敏感性而未引起太多关注。在本研究中，纤维素棒在氢氧化钠溶液中溶胀后，用尿素封端的硅烷1-(3-(三甲氧基硅基)丙基)尿素进行修饰。使用扫描电子显微镜、傅里叶变换红外光谱和X射线衍射研究了纤维素颗粒的形态和结构，证实了处理后的纤维素颗粒与原始纤维素有显著差异。使用旋转流变仪观察了原始和改性纤维素颗粒在硅油中的流变行为。结果发现，硅烷改性的纤维素比原始纤维素颗粒表现出更高的电流变效应和更高的介电性能，这不仅与接枝的极性分子有关，还可能与处理后的纤维素颗粒的多孔形态有关。
