Structure-property correlation of crosslinked domain hydrogels exhibiting thermoresponsive mechanical toughening and hybridization with photoluminescent carbon dots
Structure-property correlation of crosslinked domain hydrogels exhibiting thermoresponsive mechanical toughening and hybridization with photoluminescent carbon dots
复制标题
交联域水凝胶的结构-性能相关性表现出热响应机械增韧和与光致发光碳点的杂交
DOI：
10.1039/d2py00423b
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发表时间：
2022
影响因子：
4.6
通讯作者：
Shokyoku Kanaoka
中科院分区：
文献类型：
--
作者：
Shohei Ida;Takahiro Okuno;Miki Morimura;Kazumasa Suzuki;Hiroki Takeshita;Masatoshi Oyama;Keiji Nakajima;Shokyoku Kanaoka
表现出多种特性的刺激响应同时变化的水凝胶对于各种应用都很有吸引力。我们最近开发了一种具有热响应性交联域（CD）结构的凝胶，该凝胶在空气中加热时进行机械增韧，同时保持高透明度。在这项研究中，我们评估了具有热响应性CD结构的水凝胶的结构-性能相关性，该水凝胶是通过聚合诱导自组装（PISA）过程制备的，该过程使用N-异丙基丙烯酰胺（NIPAAm）与亲水性聚（N,N-二甲基丙烯酰胺）（PDMAAm）的可逆加成-断裂链转移（RAFT）聚合 宏观链转移剂（宏观CTA）。大CTA的分子量对产物凝胶在水中的溶胀行为有轻微影响，而具有适当分子量的大CTA产生的凝胶表现出明显的机械增韧，加热时弹性模量和伸长率增加。凝胶的组成显着影响其高温下的机械性能和透明度，我们发现NIPAAm含量高达50%的凝胶由于其内部结构具有均匀分散的CDs网络而保持了透明度。此外，我们成功地获得了一种凝胶，通过与碳点杂化，在加热时同时表现出机械增韧和增强的光致发光。
A hydrogel exhibiting stimuli-responsive simultaneous change in multiple properties is attractive for various applications. We have recently developed a gel with a thermoresponsive crosslinked domain (CD) structure, which underwent mechanical toughening upon heating in air with maintenance of high transparency. In this study, we evaluated the structure–property correlation of a hydrogel having a thermoresponsive CD structure prepared by a polymerization-induced self-assembly (PISA) process using reversible addition–fragmentation chain transfer (RAFT) polymerization of N-isopropylacrylamide (NIPAAm) with a hydrophilic poly(N,N-dimethylacrylamide) (PDMAAm) macro-chain transfer agent (macro-CTA). The molecular weight of the macro-CTA had a slight effect on the swelling behavior of the product gels in water, while a macro-CTA with an appropriate molecular weight yielded a gel exhibiting pronounced mechanical toughening with an increased elastic modulus and elongation upon heating. The composition of the gel significantly affected its mechanical properties and transparency at a high temperature, and we found that a gel with an NIPAAm content as high as 50% maintained the transparency due to an internal structure with homogeneously dispersed CDs in the network. In addition, we successfully obtained a gel exhibiting simultaneous mechanical toughening and enhanced photoluminescence upon heating by hybridization with carbon dots.