天然橡胶/细菌纤维素晶须复合材料的水触发模量变化（英文）

Water-triggered modulus changes of natural rubber / bacterial cellulose whiskers nanocomposites

采用蒸发法将细菌纤维素晶须(BCWs)与天然橡胶(NR)胶乳混合制备了NR/BCWs复合材料,研究了其吸水性能及吸水前后常温储能模量的变化。结果表明,NR/BCWs复合材料的吸水过程可分为2步,第1步速率较大,第2步逐渐减小直至溶胀平衡状态。随着BCWs填充量的增加,NR/BCWs复合材料的平衡吸水量先减小后增大。这是由于BCWs既可以形成吸水通道增大吸水量,又能形成物理交联减小吸水量,填充量低时后者起主要作用。吸水后NR/BCWs复合材料的常温储能模量显著降低,幅度可达到2个数量级,当BCWs的填充量仅为3份时,模量变化幅度达到80.71%。

Stimuli-responslve materials that change at least one of their properties ＂on command＂, i. e. , upon exposure to light, heat, chemicals, magnetic fields, etc. , have been a long-lasting hot topic in both academia and industry over many decades. For instance, the resistivitystrain behavior of conductive polymer composites based on thermoplastic polyurethane/polyolefin elastomer was modified with multi-walled carbon nanotubes. The high performance strain sensors as well as stretchable conductors were preoared.