Poly(vinyl alcohol) Hydrogels with Broad‐Range Tunable Mechanical Properties via the Hofmeister Effect,Advanced Materials

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Poly(vinyl alcohol) Hydrogels with Broad‐Range Tunable Mechanical Properties via the Hofmeister Effect
Advanced Materials ( IF 27.4 ) Pub Date : 2021-02-08 , DOI: 10.1002/adma.202007829
Shuwang Wu _{1,

2} , Mutian Hua ₁ , Yousif Alsaid ₁ , Yingjie Du ₁ , Yanfei Ma ₁ , Yusen Zhao ₁ , Chiao-Yueh Lo ₁ , Canran Wang ₁ , Dong Wu ₁ , Bowen Yao _{1,

2} , Joseph Strzalka ₃ , Hua Zhou ₃ , Xinyuan Zhu ₂ , Ximin He ₁

Affiliation

Hydrogels, exhibiting wide applications in soft robotics, tissue engineering, implantable electronics, etc., often require sophisticately tailoring of the hydrogel mechanical properties to meet specific demands. For examples, soft robotics necessitates tough hydrogels; stem cell culturing demands various tissue‐matching modulus; and neuron probes desire dynamically tunable modulus. Herein, a strategy to broadly alter the mechanical properties of hydrogels reversibly via tuning the aggregation states of the polymer chains by ions based on the Hofmeister effect is reported. An ultratough poly(vinyl alcohol) (PVA) hydrogel as an exemplary material (toughness 150 ± 20 MJ m⁻³), which surpasses synthetic polymers like poly(dimethylsiloxane), synthetic rubber, and natural spider silk is fabricated. With various ions, the hydrogel's various mechanical properties are continuously and reversibly in situ modulated over a large window: tensile strength from 50 ± 9 kPa to 15 ± 1 MPa, toughness from 0.0167 ± 0.003 to 150 ± 20 MJ m⁻³, elongation from 300 ± 100% to 2100 ± 300%, and modulus from 24 ± 2 to 2500 ± 140 kPa. Importantly, the ions serve as gelation triggers and property modulators only, not necessarily required to remain in the gel, maintaining the high biocompatibility of PVA without excess ions. This strategy, enabling high mechanical performance and broad dynamic tunability, presents a universal platform for broad applications from biomedicine to wearable electronics.

中文翻译：

通过霍夫迈斯特效应具有宽范围可调机械性能的聚（乙烯醇）水凝胶

水凝胶在软机器人、组织工程、植入式电子产品等领域有着广泛的应用，通常需要对水凝胶的机械性能进行复杂的调整以满足特定的需求。例如，软机器人需要坚韧的水凝胶；干细胞培养需要不同的组织匹配模数；神经元探针需要动态可调的模数。在此，报道了一种通过基于霍夫迈斯特效应的离子调节聚合物链的聚集状态来可逆地广泛改变水凝胶的机械性能的策略。制备了超韧聚（乙烯醇）（PVA）水凝胶作为示例材料（韧性150±20MJ m ^-3 ），其超过了聚（二甲基硅氧烷）、合成橡胶和天然蜘蛛丝等合成聚合物。利用各种离子，水凝胶的各种机械性能在一个大窗口内连续、可逆地原位调节：拉伸强度从50±9kPa到15±1MPa，韧性从0.0167±0.003到150±20MJ·m ⁻³ ，伸长率从300±100%至2100±300%，模量从24±2至2500±140kPa。重要的是，这些离子仅充当凝胶引发剂和性能调节剂，不一定需要保留在凝胶中，从而在没有过量离子的情况下保持 PVA 的高生物相容性。该策略实现了高机械性能和广泛的动态可调性，为从生物医学到可穿戴电子产品的广泛应用提供了一个通用平台。

更新日期：2021-03-16

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