基于聚醚胺(PEA)动态交联网络的多重响应性表面褶皱图案

刺激响应性表面图案赋予了材料动态可调的表面性能,是智能材料领域研究的热点,然而如何通过简单有效的方法构建这类动态表面图案也是该领域的难点.本文将动态硼酸酯键和光可逆二聚基团引入到聚醚胺(PEA)交联网络中,通过双层褶皱体系构建一系列具有光和湿度刺激响应性表面褶皱图案.在365 nm紫外光照和加热的条件下,蒽基团(AN)的光二聚与硼酸键的形成使得上表层聚醚胺模量变大,产生微米级表面褶皱图案;在254 nm紫外光照射或水蒸气作用下,聚醚胺网络解交联,表面褶皱图案消失;利用光化学时空分辨的特性,通过光掩膜板光照还可以制备多层次动态表面褶皱图案.这种多重刺激响应性表面褶皱图案为构建智能聚合物表面提供了新思路,在传感和防伪等领域具有潜在的应用前景.

Multi-responsive Network Surface Wrinkle Based on PEA Polymer Network Containing Boronic Bond

Dynamic surface pattern with responsive morphology to environmental stimuli can possibly enable the on-demand control of the encoded surface properties,providing an important alternative to realize smart surfaces.In this study,we fabricated a series of mutli-responsive wrinkle patterns by using poly(ether amine)(PEA)-based dyanmic crosslinked network containing boronic ester and photodimer of AN as toplayer for bilayer wrinkling systems.Upon the irradiation of 365 nm UV-light and thermal treatment,the resulting crosslinked polymer network caused by photodimerization of AN and boronic ester bond with the increasing modulus induced the compressive strain in the bilayer systems,resulting in the formation of microscale wrinkling pattern.And the wrinkle pattern can be erased under the irradiation of 254 nm UV light or water due to the decrosslinking of polymer network.Owing to the spatial and temporal features of light,the dynamic hierachical pattern of wrinkle can be obtained through selective exposure with photomask.This strategy based on respsosnive polymer network containing dyanmic chemical bond provides an important alternative approach to fabricate multi-responsive patytern of wrinkle,and has potential applications in the field of sensor and anticonterfeiting.