目前,智能聚合物材料的研究已日益趋于白热化,其刺激响应性通常由温度、湿度、光和pH等外界因素引发。荷兰埃因霍温工业大学A. C.C. Esteves课题组在单一响应性智能材料基础上,设计了一种光热双重响应性水凝胶,并首次将其应用于棉织物上。
A. C.C. Esteves等人利用表面引发原子转移自由基聚合方法(SI-ARGET-ATRP),将温度响应性单体NIPAAm,光响应性单体螺吡喃丙烯酸酯衍生物接枝于带有溴引发剂的棉织物上。在与实验条件相容情况下,这种简易、适用性广的表面引发可控聚合方法可将多种刺激响应性单体接枝于天然和合成纤维。该反应条件相当简单,对氧气敏感度降低,所需溴化铜催化剂用量少,无需复杂实验装置,易于大规模制备,且具有工业应用可行性。
该新型水凝胶功能化棉织物在光热双重刺激下,从潮湿环境中吸收或释放水分,可逆并反复地改变其体积及形态。这种体积/形态变化水凝胶-棉织物在提取空气中的水分方面具有极大的潜在应用价值,对饮用水源稀缺区域来说,这项研究意义重大。
高分子科学前沿 智库人才 Dr.Spcl (DHU)撰写
摘要速递:
Dual light and temperature responsive cotton fabric functionalized with a surface-grafted spiropyran–NIPAAm-hydrogel
J. Mater. Chem. A
DOI: 10.1039/C6TA00161K
Online 23 Mar 2016
A dual-responsive cotton fabric functionalized with a spiropyran–NIPAAm hydrogel, capable of dimensional changes upon irradiation with visible light or upon a temperature stimulus is reported. These volume changes are due to absorption and release of water, from and into the air, by increasing temperature above the LCST in the dark, and/or by irradiation with sunlight or white light from artificial sources. The material was obtained via grafting photo- and temperature-responsive monomers directly from the cotton fibers, using a facile controlled polymerization method, ARGET ATRP.
————来源:高分子科学前沿