NIR-triggered dynamic exchange and intrinsic photothermal-responsive covalent adaptable networks
NIR-triggered dynamic exchange and intrinsic photothermal-responsive covalent adaptable networks
复制标题
近红外触发的动态交换和内在光热响应共价适应性网络
DOI：
10.1016/j.cej.2021.131212
复制
发表时间：
2021-07-15
影响因子：
15.1
通讯作者：
Zhang, Yanfeng
中科院分区：
文献类型：
--
作者：
Chen, Xingxing;Wang, Ruyue;Zhang, Yanfeng
制造具有内在光热响应性、nir触发焊接、多形状记忆和选择性形状记忆恢复相结合的共价自适应网络仍然是一个挑战。本文以有机铋化合物（U600）为催化剂，以1,4-苯醌二肟、杰弗明D230和六亚甲基二异氰酸酯三聚体为原料，研制了一系列聚脲肟聚氨酯热固性材料（puou）。puou固有的强烈光热效应可以触发和操纵肟-氨基甲酸酯键的动态交换，从而在近红外激光（NIR, λ = 808 nm）照射下进行快速焊接。近红外激光辐照强度为2.7 W/cm(2)，辐照150 s后，重叠面积为4 cm × 4 cm的两个puou的搭接剪切强度达到1.2 MPa。由于puou的两个独立的玻璃化转变温度，检测到三重形状记忆特性，并且在近红外照射区域可以实现选择性形状记忆恢复。因此，puou在可焊接热固性材料的构建方面显示出巨大的潜力，并可能在智能形状记忆器件中找到应用。
Fabrication of covalent adaptable networks with the combination of intrinsic photothermal responsiveness, NIR-triggered welding, multiple-shape memory, and selective shape memory recovery remains a challenge. Herein, we developed a series of poly(urea-oxime urethane) thermosets (PUOUs) based on 1,4-benzoquinone dioxime, Jeffamine D230, and hexamethylene diisocyanate trimer using an organic bismuth compound (U600) as the catalyst. The inherently strong photothermal effect of the PUOUs could trigger and manipulate the dynamic exchange of oxime-carbamate bonds to undergo rapid welding by near-infrared laser (NIR, lambda = 808 nm) irradiation. The lap shear strength of the two PUOUs with an overlapped area of 4 cm x 4 cm reached 1.2 MPa after irradiation by a NIR laser for 150 s with an irradiation intensity of 2.7 W/cm(2). Due to the two independent glass transition temperatures of the PUOUs, triple shape memory property was detected and selective shape memory recovery could achieve in the area subjected to NIR irradiation. Hence, the PUOUs show vast potential for the construction of weldable thermosets and may find applications in intelligent shape-memory devices.