通过离子交联和氢键作用实现 P(AM-co-AA)/壳聚糖季铵盐复合水凝胶的高强度、导电性和抑菌性,Langmuir

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通过离子交联和氢键作用实现 P(AM-co-AA)/壳聚糖季铵盐复合水凝胶的高强度、导电性和抑菌性
Langmuir ( IF 3.7 ) Pub Date : 2023-06-14 , DOI: 10.1021/acs.langmuir.3c00646
Li'an Jiang _{1,

2} , Song Tian _{1,

2} , Yuhui Xie _{1,

2} , Xue Lv _{1,

2} , Shulin Sun _{1,

2}

Affiliation

传统的单交联网络结构水凝胶存在拉伸性差、灵敏度低、易污染等问题，严重影响了其在应变传感器领域的实际应用。为了克服这些缺点，本文设计了多物理交联策略（离子交联和氢键）来制备基于壳聚糖季铵盐（HACC）修饰的P（AM-co-AA）（丙烯酰胺-co-）的水凝胶应变传感器。丙烯酸共聚物）水凝胶。双网络P(AM- co -AA)/HACC水凝胶的离子交联是通过浸渍法实现的，以Fe ³⁺作为交联位点，与氨基(−NH ₂）和P（AM- co -AA）上的羧基（−COOH），使水凝胶能够快速恢复和重组，从而产生了具有优异拉伸应力（3 MPa）、伸长率（1390 %)、弹性模量(0.42 MPa)、韧性(25 MJ/m ³）。此外，制备的水凝胶表现出高电导率（21.6 mS/cm）和灵敏度（0-20%应变时GF = 5.02，20-100%应变时GF = 6.84，100-480%应变时GF = 10.27）。此外，HACC的引入赋予水凝胶优异的抗菌性能（高达99.5%），对杆菌、球菌和芽孢三种形式的细菌具有优异的抗菌活性。这种柔性、导电、抗菌的水凝胶可作为应变传感器，实时检测关节运动、言语、呼吸等人体运动，在可穿戴设备、软机器人系统等领域展现出广阔的应用前景。

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High Strength, Conductivity, and Bacteriostasis of the P(AM-co-AA)/Chitosan Quaternary Ammonium Salt Composite Hydrogel through Ionic Crosslinking and Hydrogen Bonding

Traditional hydrogels with a single-crosslinked network structure suffer from poor stretchability, low sensitivity, and easy contamination, which seriously affect their practical application in the strain sensor field. To overcome these shortcomings, herein, a multiphysical crosslinking strategy (ionic crosslinking and hydrogen bonding) was designed to prepare a hydrogel strain sensor based on chitosan quaternary ammonium salt (HACC)-modified P(AM-co-AA) (acrylamide-co-acrylic acid copolymer) hydrogels. The ionic crosslinking for the double-network P(AM-co-AA)/HACC hydrogels was achieved by an immersion method with Fe³⁺ as crosslinking sites, which crosslinked with the amino group (−NH₂) on HACC and the carboxyl group (−COOH) on P(AM-co-AA) and enabled the hydrogels to recover and reorganize rapidly, resulting in a hydrogel-based strain sensor with excellent tensile stress (3 MPa), elongation (1390%), elastic modulus (0.42 MPa), and toughness (25 MJ/m³). In addition, the prepared hydrogel exhibited high electrical conductivity (21.6 mS/cm) and sensitivity (GF = 5.02 at 0–20% strain, GF = 6.84 at 20–100% strain, and GF = 10.27 at 100–480% strain). Furthermore, the introduction of HACC endowed the hydrogel with excellent antibacterial properties (up to 99.5%) and excellent antibacterial activity against bacteria of three forms, bacilli, cocci, and spores. The flexible, conductive, and antibacterial hydrogel can be applied as a strain sensor for real-time detection of human motions such as joint movement, speech, and respiration, which exhibits a promising application prospect in wearable devices, soft robotic systems, and other fields.

更新日期：2023-06-14

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