Structure–property correlation of crosslinked domain hydrogels exhibiting thermoresponsive mechanical toughening and hybridization with photoluminescent carbon dots,Polymer Chemistry

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Structure–property correlation of crosslinked domain hydrogels exhibiting thermoresponsive mechanical toughening and hybridization with photoluminescent carbon dots
Polymer Chemistry ( IF 4.1 ) Pub Date : 2022-05-19 , DOI: 10.1039/d2py00423b
Shohei Ida ₁ , Takahiro Okuno ₁ , Miki Morimura ₁ , Kazumasa Suzuki ₁ , Hiroki Takeshita ₁ , Masatoshi Oyama ₂ , Keiji Nakajima ₂ , Shokyoku Kanaoka ₁

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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.

中文翻译：

表现出热响应机械增韧和与光致发光碳点杂交的交联域水凝胶的结构-性质相关性

在多种特性中表现出对刺激响应的同时变化的水凝胶对于各种应用具有吸引力。我们最近开发了一种具有热响应交联域 (CD) 结构的凝胶，该凝胶在空气中加热后经历机械增韧并保持高透明度。在这项研究中，我们评估了具有热响应 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) 工艺使用N-异丙基丙烯酰胺 (NIPAAm)的可逆加成-断裂链转移 (RAFT) 聚合制备的。与亲水性聚 ( N , N-二甲基丙烯酰胺）（PDMAAm）大链转移剂（macro-CTA）。大分子 CTA 的分子量对产品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分子 CTA 产生的凝胶表现出明显的机械增韧，弹性模量和热伸长率增加。凝胶的成分显着影响其在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在网络中具有均匀分散的 CDs 而保持透明度。此外，我们通过与碳点的杂交成功地获得了一种凝胶，该凝胶在加热时表现出同时机械增韧和增强的光致发光。

更新日期：2022-05-19

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