纤维素／聚羟基丁酸酯电活性复合膜的制备及性能

Preparation and Performance of Cellulose/Poly(Hydroxybutyrate) Electroactive Composite Membrane

以三氟乙酸为溶剂,采用溶液共混旋转浇注法制备了纤维素/聚羟基丁酸酯电活性复合膜材料。通过扫描电子显微镜、红外光谱、差示扫描量热分析、X射线衍射对复合膜材料进行了表征,并测试了复合膜材料的力学性能与电活性性能。结果表明,复合膜材料中纤维素的结晶规整度下降,结晶度指数下降了29%;复合膜材料的断裂强度、断裂伸长率及杨氏模量分别为74MPa、7.2%和2.5GPa,较PHB有较大的提高;电活性复合膜材料最高可产生1.35cm的弯曲应变响应,较纯纤维素膜电活性材料性能提高了约50%,这种材料有望应用于制动器、感应器等领域。

The cellulose/poly （hydroxybutyrate）（PHB） electroactive composite membranes were prepared by dissolving cotton cellulose and PHB powder in trifluoroacetic acid （TFA） , followed by solution casting. The characteristics of the cellulose/PHB electroactive composite membrane were investigated by SEM, FT-IR, DSC and XRD. The mechanical and electroactive performance of the cellulose/PHB electroactive composite membrane were tested. The results indicate that the crystallinity index of cellulose in the composite membrane calculated based on XRD pattern decreases about 29 % compared with that of pure cellulose membrane. The tensile strength, elongation at break and Young＇ s modulus of the cellulose/PHB electroactive composite membrane are 74MPa, 7.2% and 2.5GPa, respectively, which increase greatly compared with of pure PHB. The bending displacement of the cellulose/PHB electroactive composite membrane can achieve 1.35 cm, increases by 50 % compared with that of pure cellulose membrane. These cellulose/PHB electroactive composite membranes might have potential applications in the field of actuator, sensor etc.