POLYMAT, Department of Polymer Science and Technology, University of the Basque Country UPV-EHU, PO Box 1072, 20080 Donostia/San Sebastian, Gipuzkoa, Spain.
Macrobehaviour-Mesostructure-Nanotechnology SGIker Service, Faculty of Engineering, University of the Basque Country UPV-EHU, Plaza Europa 1, 20018 Donostia/San Sebastian, Gipuzkoa, Spain.
Molecules. 2020 Mar 29;25(7):1568. doi: 10.3390/molecules25071568.
Epoxy/Polycaprolactone (PCL) blends cured with a conventional diamine (4,4'-diaminodiphenylmethane, DDM) and with different amounts of a disulfide containing diamine (4, 4´-dithioaniline, DSS) were prepared through melting. The curing process was studied by FTIR and differential scanning calorimetry (DSC) and the mechanical behavior of the networks was studied by DMA. The shape memory properties and the recyclability of the materials were also analyzed. All blends showed a very high curing degree and temperature activated shape memory effect, related to the glass transition of the epoxy resin. The PCL plasticized the mixture, allowing tailoring of the epoxy glass transition. In addition, in the blends cured with DSS, as a consequence of the disulfide exchange reaction, the permanent shape could be erased and a new shape could be reprogrammed. Using this strategy, reprogrammable permanent shape memory materials were obtained.
通过熔融法制备了用传统二胺（4,4'-二氨基二苯甲烷，DDM）和不同量含二硫键二胺（4,4´-二硫代苯胺，DSS）固化的环氧树脂/聚己内酯（PCL）共混物。通过傅里叶变换红外光谱（FTIR）和差示扫描量热法（DSC）研究了固化过程，通过 DMA 研究了网络的力学性能。还分析了材料的形状记忆性能和可回收性。所有共混物都显示出非常高的固化度和温度激活的形状记忆效应，这与环氧树脂的玻璃化转变温度有关。PCL 增塑了混合物，允许对环氧树脂的玻璃化转变温度进行调整。此外，在用 DSS 固化的共混物中，由于二硫键交换反应，永久形状可以被擦除，并且可以重新编程新的形状。通过这种策略，获得了可重复编程的永久形状记忆材料。
