Tunable and Processable Shape-Memory Materials Based on Solvent-Free, Catalyst-Free Polycondensation between Formaldehyde and Diamine at Room Temperature
Tunable and Processable Shape-Memory Materials Based on Solvent-Free, Catalyst-Free Polycondensation between Formaldehyde and Diamine at Room Temperature
复制标题
基于室温下甲醛和二胺之间无溶剂、无催化剂缩聚的可调谐和可加工形状记忆材料
DOI：
10.1021/acsmacrolett.9b00199
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发表时间：
2019-05-01
影响因子：
7.015
通讯作者：
Zhang, Yanfeng
中科院分区：
文献类型：
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作者：
Lei, Hengxin;Wang, Shengnan;Zhang, Yanfeng
与传统热固性材料相比，可塑性热固性材料在航空航天、生物技术和建筑领域有更多的应用。本文报道了一种无溶剂、无催化剂的二胺与甲醛一步缩聚法，制备了一系列具有延展性的半缩醛胺动态共价网络（HDCN）。该材料具有良好的延展性和热压可再加工性。由甲醛和4，4-二氨基二苯甲烷（MDA）缩聚制得的HDCN的杨氏模量和断裂强度分别高达1.6GPa和60 MPa，且可通过引入聚醚胺-400（PEDA）进行调节。此外，HDCN具有形状记忆能力，其回复率在93.5%以上，并且可以通过添加不同的单体来回收。该HDCN具有良好的工业应用前景，且原料价廉易得。
Compared with traditional thermosets, malleable thermosets have more applications in aerospace, biotechnology, and construction. Here we report a one-step, solvent-free, catalyst-free polycondensation method between diamine and formaldehyde to prepare a series of malleable hemiaminal dynamic covalent networks (HDCNs). The materials have excellent malleability and reprocessability by hot pressing. The Young's modulus and breaking strength of HDCNs obtained by the polycondensation of formaldehyde and 4,4-diaminodiphenylmethane (MDA) are as high as 1.6 GPa and 60 MPa, respectively, which can be facilely adjusted through the introduction of polyetheramine-400 (PEDA). Moreover, the HDCNs feature the shape memory ability with a recovery ratio above 93.5% and can be recycled by the addition of different monomers. This promising HDCN, prepared from economical raw materials, may have vast applications in industries.