Development of high temperature shape memory polymers with fast response time and recyclable performance is highly desired. In this study, a new semi-aromatic tri-amine (TRIA) containing thioether unit is prepared through the reaction of trifluoro-monomer and p-mercaptoaniline (p-MA). It is conducted to polymerize with 4,4′-thiodibenzoyl chloride (TDC) and different ratios of diamine (both of them contained flexible thioether group) to supply a series of slightly crosslinking semi-aromatic polyamide. It is found that the resultant polymers had excellent thermal properties (T_g, 237.9–245.8 °C, T_d, 430.9–436.5 °C) and mechanical properties (tensile strength, 74–100 MPa). Because of the introduction of the large amount of flexible thioether group, the resultant polyamides can be dissolved in some aprotic solvents, and can be processed with solution method to fabricate a series of fast-responsive shape memory film (SMF) with a responsive time of 6–8 s, recovery rate of 98–99.5% after 20 cycles. What's more, the oxidized film can even lift a weight equal to about 2–3 times (vertical direction) and 5–8 times (horizontal direction) of its own weight. Interestingly, unlike other shape memory polymers, these SMF after multiple processes (after bending-recovery cycle at high temperature) can still be processed repeatedly with a solution route, which supplies a novel and recyclable candidate for excellent performance SMP. It is expected to be used in solar cell wingspan actuator to light the satellite weight.

迫切需要开发具有快速响应时间和可回收性能的高温形状记忆聚合物。在这项研究中，通过三氟单体与对巯基苯胺（p-MA）的反应制备了一种新的含硫醚单元的半芳香族三胺（TRIA）。它与4,4'-硫代二苯甲酰氯（TDC）和不同比例的二胺（均含有柔性硫醚基团）进行聚合，以提供一系列轻度交联的半芳族聚酰胺。发现所得的聚合物具有优异的热性能（T _g，237.9–245.8°C，T _d，430.9–436.5°C）和机械性能（拉伸强度，74–100 MPa）。由于引入了大量的柔性硫醚基团，因此可以将所得聚酰胺溶解在一些非质子溶剂中，并可以通过溶液法进行加工，以制造出一系列响应时间为10min的快速响应形状记忆膜（SMF）。 6–8 s，20个循环后恢复率为98–99.5％。而且，氧化膜甚至可以提起相当于其自身重量2到3倍（垂直方向）和5到8倍（水平方向）的重量。有趣的是，与其他形状记忆聚合物不同，这些SMF经过多次处理（在高温下的弯曲恢复循环之后）仍可以通过溶液路径重复进行处理，这为实现出色的SMP提供了一种新颖且可回收的候选材料。