In this work, we fabricated a triple‐shape memory polymeric material though in situ crosslinking of poly(butylene adipate‐co‐terephthalate)/ε‐polycaprolactone blends induced by electron beam irradiation. The intrinsic property of irradiation crosslinking, crosslinking rule in this heterogeneous system, formation of interfacial bridge molecular, and the resulted interfacial strength were investigated. No obvious interfacial slips were observed in tensile test, and the elongation at break was above 900%. The high‐temperature relaxation and recovery experiments at nonlinear region confirmed the excellent hyperelasticity and recovery ratios (R_r) can be as high as 95% for samples irradiated above 96 kGy. The mismatch between heating rate and relaxation kinetics resulted in both instable temporary shapes and heating‐mode dependent recovery behavior during the recovery process. Self‐stability of the temporary shape at middle temperature was also emphasized in view of the phenomenon that the second R_r was above 100% in our experiments. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48588.

中文翻译：

---

通过电子束辐射原位交联聚己二酸-对苯二甲酸丁二醇酯/ε-聚己内酯制备的三重形状记忆材料及其三重形状记忆效应

在这项工作中，我们制造的三重形状记忆聚合物材料虽然原位交联的聚（亚丁基己二酸酯共由电子束照射引起的-terephthalate）/ε -聚己内酯的共混物。研究了辐射交联的内在性质，该非均相体系中的交联规律，界面桥分子的形成以及所得的界面强度。在拉伸试验中没有观察到明显的界面滑移，并且断裂伸长率高于900％。非线性区域的高温松弛和恢复实验证实了优异的超弹性和恢复率（R _r对于96 kGy以上的辐照样品）可以高达95％。加热速率和松弛动力学之间的不匹配导致不稳定的临时形状以及在恢复过程中依赖于加热模式的恢复行为。考虑到第二个R _r在我们的实验中高于100％的现象，也强调了中间温度下临时形状的自稳定性。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学 2020，137，48588。