材料期刊网

利于聚氨酯对纤维素进行改性研究,介绍了纤维素/聚氨酯半互穿网络的制备方法,并利用红外光谱（FT-IR）、扫描电子显微镜（SEM）、X射线衍射（XRD）、力学性能及电学性能的测试对纤维素/聚氨酯半互穿网络的特征进行研究。结果表明,在半互穿网络中纤维素和聚氨酯具有明显的相分离现象;线性纤维素分子穿插于已交联的聚氨酯网中,形成半互穿网络;相比纯纤维素,纤维素/聚氨酯半互穿网络中纤维素的结晶规整度下降,结晶度变小,但强度和杨氏模量有较大的提高;小电压下,位移偏量得到大幅提高,这种材料有望作为电活性材料应用于制动器、感应器等领域。

To prepare the cellulose/polyurethane semi-interpenetrating polymer network（sIPN）,cotton cellulose was dissolved into the N,N-dimethylacetamide（DMAc） and lithium chloride（LiCl） solvent system.PU prepolymer prepared by poly[di（ethylene glycol） adipate] and hexamethylene diisocyanate（HDI） was mixed with DMAc cellulose solution by stirring.The mixed solution was spincoated on a wafer and cured to form cellulose/polyurethane semi-IPN films using 1,1,1-tris（hudroxymethyl）propane as the cross-linker.The characteristics of the cellulose/polyurethane semi-IPN film were investigated by Fourier transform infrared spectrum（FT-IR）,scanning electron microscopy（SEM）,X-ray diffraction pattern（XRD）,the tensile test and the electrical performance.The results indicate that for the cellulose/polyurethane semi-IPN film,the complicated domain structure indicates the presence of phase separation in this system.Compared with the pure cellulose,the crystallinity of cellulose in the sIPN decreases.However,the tensile test results show that Young’s modulus increases by 34% with the formation of sIPN in the cellulose.The tip displacement under the low direct current（DC） voltage has been greatly improved from 0.5mm to 50mm after the sIPN formation.This cellulose/polyurethane sIPN might have potential applications in the field of actuator,sensor etc as electro-active materials.