Instant Thermal Switching from Soft Hydrogel to Rigid Plastics Inspired by Thermophile Proteins.,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Instant Thermal Switching from Soft Hydrogel to Rigid Plastics Inspired by Thermophile Proteins.
Advanced Materials ( IF 27.4 ) Pub Date : 2019-11-18 , DOI: 10.1002/adma.201905878
Takayuki Nonoyama ₁ , Yong Woo Lee ₂ , Kumi Ota ₂ , Keigo Fujioka ₂ , Wei Hong _{3,

4,

5} , Jian Ping Gong _{1,

6}

Affiliation

Proteins of thermophiles are thermally stable in a high-temperature environment, adopting a strategy of enhancing the electrostatic interaction in hydrophobic media at high temperature. Herein, inspired by the molecular mechanism of thermally stable proteins, the synthesis of novel polymer materials that undergo ultrarapid, isochoric, and reversible switching from soft hydrogels to rigid plastics at elevated temperature is reported. The materials are developed from versatile, inexpensive, and nontoxic poly(acrylic acid) hydrogels containing calcium acetate. By the cooperative effects of hydrophobic interaction and ionic interaction, the hydrogels undergo significant spinodal decomposition and subsequent rubbery-to-glassy transition when heated to an elevated temperature. As a result, the gels exhibit super-rapid and significant hikes in stiffness, strength, and toughness by up to 1800-, 80-, and 20-folds, respectively, when the temperature is raised from 25 to 70 °C, while the volumes of the gels are almost unchanged. As a potential application, the performance of the materials as athletic protective gear is demonstrated. This work provides a pathway for developing thermally stiffened materials and may significantly broaden the scope of polymer applications.

中文翻译：

即时热转换从软水凝胶转变为受嗜热蛋白质启发的硬质塑料。

嗜热蛋白在高温环境下是热稳定的，采取了在高温下增强疏水介质中静电相互作用的策略。在此，受热稳定蛋白质的分子机理的启发，报道了在高温下经历从软水凝胶到刚性塑料的超快速，等速和可逆转换的新型聚合物材料的合成。该材料是由通用，廉价且无毒的含有乙酸钙的聚（丙烯酸）水凝胶开发而成的。通过疏水相互作用和离子相互作用的协同作用，当加热至高温时，水凝胶经历明显的旋节线分解和随后的橡胶状至玻璃态的转变。结果，这些凝胶表现出了超快速且显着的刚度提高，当温度从25升至70°C时，其强度和韧性分别提高了1800倍，80倍和20倍，而凝胶的体积几乎没有变化。作为一种潜在的应用，证明了该材料作为运动防护装备的性能。这项工作为开发热硬化材料提供了途径，并可能大大拓宽聚合物的应用范围。

更新日期：2020-01-27

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11