Fluorescent gels with fast and reversible responses have attracted extensive attention, but it remains a huge challenge to synthesize high performance multistimuli-responsive fluorescent gel through a facile and versatile approach. In this work, a multistimuli-responsive fluorescent thioctic acid-crosslinked hyperbranched polymer gel (TLHP) was designed and fabricated by copolymerization of acrylic acid, amino-ended hyperbranched polymers (AHP), tetrakis(4-aminophenyl)ethene (TPE-4NH) and thioctic acid (TA). The structures of the TLHP gel were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). AHP played an important role in the TLHP gel. The terminal amino groups of AHP and TPE-4NH in the network served as strong complexing centers with carboxylic groups of TA and acrylic acid by hydrogen bonding interactions, thus a unique toughening and self-healing strategy for the supramolecular network was established. Compared with poly(TA and acrylic acid) (TPAA), TLHP-0.4 % which incorporated 0.4 % TPE-4NH exhibited excellent mechanical properties, with tensile strength up to 438 kPa and stretchability up to 741 %, increased by 193.3 % and 45.3 %, respectively. In addition, TLHP-0.4 % was crosslinked through the dynamic covalent disulfide bonds and the noncovalent H-bonds between amino or carboxy groups, and exhibited fluorescence responsiveness to temperature, pH, and metal ions, greatly expanding the application of TLHP as rewritable printing ink and temperature-based erasing. The fluorescence of TLHP was also sensitive to Cu, and the intensity can be restored by EDTA solution to realize fluorescence “switching”. The multistimuli-responsive fluorescence of TLHP may have broad prospects in reversible patterning displays, multi-level anti-counterfeiting applications for information security, and various potential applications.

中文翻译：

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基于硫辛酸和超支化聚合物的多刺激响应荧光聚合物凝胶

具有快速、可逆响应的荧光凝胶引起了广泛的关注，但通过简便、通用的方法合成高性能多刺激响应荧光凝胶仍然是一个巨大的挑战。在这项工作中，通过丙烯酸、氨基末端超支化聚合物（AHP）、四（4-氨基苯基）乙烯（TPE-4NH）的共聚，设计并制备了多刺激响应荧光硫辛酸交联超支化聚合物凝胶（TLHP）。和硫辛酸（TA）。通过傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和X射线光电子能谱（XPS）对TLHP凝胶的结构进行了表征。 AHP 在 TLHP 凝胶中发挥了重要作用。网络中AHP和TPE-4NH的末端氨基通过氢键作用与TA和丙烯酸的羧基形成强络合中心，从而建立了独特的超分子网络增韧和自修复策略。与聚TA和丙烯酸（TPAA）相比，掺入0.4% TPE-4NH的TLHP-0.4%表现出优异的机械性能，拉伸强度高达438 kPa，拉伸率高达741%，分别提高了193.3%和45.3% ， 分别。此外，TLHP-0.4%通过氨基或羧基之间的动态共价二硫键和非共价氢键交联，并对温度、pH和金属离子表现出荧光响应性，极大地扩展了TLHP作为可重写印刷油墨的应用和基于温度的擦除。 TLHP的荧光对Cu也很敏感，可以通过EDTA溶液恢复强度，实现荧光“切换”。 TLHP的多刺激响应荧光在可逆图案显示、信息安全的多级防伪应用以及各种潜在应用中可能具有广阔的前景。