3种工艺制备的丁苯橡胶／细菌纤维素晶须复合材料的水触发硬-软转变

Water induced stiff-soft transition of butadiene-styrene rubber/bacterial cellulose whiskers nano-composites prepared by three different approaches

分别采用模压法、浇注法和蒸发法制备了丁苯橡胶／细菌纤维素晶须（SBR／BCWs）复合材料，研究了制备方法对SBR／BCWs复合材料的吸水性能及水触发硬一软转变的影响。结果表明，相比于空白样，模压法和浇注法制备的复合材料的吸水性能下降，而蒸发法制备的复合材料的吸水性能显著提高。相比于模压法，浇注法和蒸发法制备的复合材料变化更加显著，常温储能模量变化幅度可达近2个数量级。蒸发法制备的复合材料的吸水性能和水触发硬一软转变最佳。

Materials responding to small variation of environmental conditions by the change of their properties such as mechanical properties and electrical properties are known as stimuli-responsive materials. They have drawn great interests in both academia and industry owing to their various potential applications. Recently, researchers made natural rubber/reduced graphene oxide nano-composites prepared by water- based solution casting. The resuhs showed that the nano-eomposites exhibited outstanding strain sensitivity and repeatability, which could be used to detect the cyclic movements of human joints. Bacterial cel- lulose whiskers（BCWs） appear as slim rod shape, which can be ob- tained from bacterial cellulose via acid hydrolysis. They can serve as promising nano-reinforcements owing to their renewable nature.