自愈水凝胶
可逆加成-断裂链转移聚合
聚合
木筏
链式转移
自由基聚合
材料科学
聚合物
光化学
辐照
化学工程
化学
高分子化学
复合材料
物理
核物理学
工程类
作者
Zilong Wu,Tong Zhang,Xiaobing Shi,Nathaniel Corrigan,Gervase Ng,Cyrille Boyer
标识
DOI:10.1002/anie.202302451
摘要
We report an aqueous and near-infrared (NIR) light mediated photoinduced reversible addition-fragmentation chain transfer (photo-RAFT) polymerization system catalyzed by tetrasulfonated zinc phthalocyanine (ZnPcS4- ) in the presence of peroxides. Taking advantage of its fast polymerization rates and high oxygen tolerance, this system is successfully applied for the preparation of hydrogels. Exploiting the enhanced penetration of NIR light, photoinduced gelation is effectively performed through non-transparent biological barriers. Notably, the RAFT agents embedded in these hydrogel networks can be reactivated on-demand, enabling the hydrogel healing under NIR light irradiation. In contrast to the minimal healing capability (<15 %) of hydrogels prepared by free radical polymerization (FRP), RAFT-mediated networks display more than 80 % recovery of tensile strength. Although healable polymer networks under UV and blue lights have already been established, this work is the first photochemistry system using NIR light, facilitating photoinduced healing of hydrogels through thick non-transparent barriers.
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