Programming of Shape Memory Natural Rubber for Near-Discrete Shape Transitions
Programming of Shape Memory Natural Rubber for Near-Discrete Shape Transitions
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DOI：
10.1021/am507184c
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发表时间：
2015-01-28
影响因子：
9.5
通讯作者：
Tiller, Joerg C.
中科院分区：
文献类型：
--
作者：
Quitmann, Dominik;Reinders, Frauke M.;Tiller, Joerg C.
典型的形状记忆聚合物是热编程的，在10K甚至更宽的温度范围内显示出形状转变。冷程序形状记忆天然橡胶(SMNR)在1K内可恢复80%以上的原始形状，拉伸几周后可提高触发点，而不会失去较窄的触发点范围。用非仿生溶剂蒸气处理拉伸的SMNR可以加速这一过程。与老化相比，低浓度的仿生溶剂蒸气具有更高的触发点。这样，即使是交联度更高的天然橡胶也可以进行冷编程。
Typical shape memory polymers are hot-programmed and show a shape transition over a broad temperature range of 10 K and more. Cold-programmed shape memory natural rubber (SMNR) recovers more than 80% of its original shape within 1 K. The trigger point can be increased upon aging the stretched SMNR over several weeks without losing the narrow trigger range. This process can be accelerated by treatment of the stretched SMNR with nonaffine solvent vapors. Affine solvent vapors of low concentrations afford higher trigger points than that achieved by aging. This way, even higher cross-linked natural rubber can be cold-programmed.