分子间相互作用调控丝素蛋白/聚丙烯酰胺水凝胶的网络形貌和β片结晶,赋予水凝胶优异的黏附、应变和传感性能

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中文摘要：丝素蛋白(SF)作为一种特殊的天然聚合物,具有优异的生物相容性、生物降解性和双亲性,是制备柔性传感器的良好候选者.然而,丝素蛋白的高结晶度和结晶不可控性使获得这种出色的仿生水凝胶传感器具有挑战性.纯SF水凝胶是脆性的,没有黏性.在此,我们通过引入聚丙烯酰胺(PAM)到SF水凝胶中来解决这一问题.由于SF/PAM水凝胶具有较强的分子间相互作用,其网络形貌由欧几里得孔改变为非欧几里得孔.同时,其β片结晶很容易被抑制到纳米尺度.这些演变不仅使SF/PAM水凝胶具有优异的机械性能,而且具有出色的黏附性能.与纯PAM水凝胶相比,SF8/PAM水凝胶的拉伸强度、拉伸破坏应变、抗压强度(80％应变下)和黏附性能(在猪皮上)分别提高了 133.1％、120.9％、610.8％和104.8％.此外,SF的双亲性可以使碳纳米管(CNTs)在水凝胶中分散良好.制备的CNT0.3/SF8/PAM水凝胶继承并进一步改善了上述性能.除此之外,它还表现出优异的自黏附传感性能,最大灵敏度因子高达10.13,工作应变范围超过1000％,大应变下稳定循环拉伸达500次以上.同时,六种人类活动的精确检测也得到了验证.本工作为实现高性能SF基水凝胶提供了新策略,并证实SF/PAM水凝胶在柔性可穿戴应变传感器中具有广阔的应用前景.

外文标题：Intermolecular interaction simultaneously mediated network morphology and β-sheet crystallization of silk fibroin/polyacrylamide hydrogel for its excellent adhesive strain sensing performances

外文摘要：Silk fibroin(SF),as a special natural polymer,is a good candidate for preparing flexible sensor due to its ex-cellent biocompatibility,biodegradability and amphiphilic properties.However,the high and uncontrollable crystal-lization of SF makes it challenge to be utilized in excellent biomimetic SF hydrogel sensor.Neat SF hydrogel is brittle and not adhesive.Here,polyacrylamide(PAM)was introduced to the SF hydrogel to address this issue.Due to their strong in-termolecular interaction,the network morphology of SF/PAM hydrogel was altered to non-Euclidean pore from Euclidean one.Meanwhile,its β-sheet crystallization was suppressed to nanoscale readily.These evolutions endow the SF/PAM hy-drogel with not only enhanced mechanical properties but also excellent adhesion performance.Compared with that of neat PAM hydrogel,tensile strength,tensile failure strain,com-pressive strength(under 80％strain)and adhesion perfor-mance(on pig skin)of the SF8/PAM hydrogel are increased by 133.1％,120.9％,610.8％and 104.8％,respectively.Ad-ditionally,the amphiphilicity of SF could make the carbon nanotubes(CNTs)disperse well in hydrogel.CNT0.3/SF8/PAM hydrogel not only inherits but also improves the above properties.It exhibits excellent adhesive sensing performance with maximal gauge factor of 10.13,working strain range of 1000％and stability as long as over 500 cycles.The detection of six human activities was also demonstrated.This work affords a general strategy to achieve high-performance SF-based hy-drogel and indicates that the SF/PAM hydrogel possesses great promise for applications in flexible wearable strain sensors.

外文关键词：

silk fibroinintermolecular interactionnetwork morphologyβ-crystallizationadhesionhydrogel strain sensor

作者：

杨德桢、孙传强、韩哲、袁宝刚、潘栋、陈金传、许华杰、刘春太、申长雨

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作者单位：

State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,National Engineering Research Center for Advanced Polymer Processing Technology,the Key Laboratory of Advanced Materials Processing & Mold of Ministry of Education,Zhengzhou University,Zhengzhou 450002,China

关键词：

silk fibroin intermolecular interaction network morphology β-crystallization adhesion hydrogel strain sensor

基金：

National Key R&D Program of ChinaShenzhen Science and Technology ProgramScience and Technology Major Project of Henan Province

项目编号：

2019YFA0706802CJGJZD20210408092602006221100240400

出版年：

2024

DOI：

10.1007/s40843-023-2849-6

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(5)

参考文献量1