Self-healing, piezoresistive and temperature responsive behaviour of chitosan/polyacrylic acid dynamic hydrogels

被引:3
|
作者
Conejo-Cuevas, Guillermo [1 ,2 ]
Lopes, Ana Catarina [1 ,3 ]
Badillo, Inari [4 ]
del Campo, Francisco Javier [2 ,3 ]
Ruiz-Rubio, Leire [1 ,2 ]
Perez-Alvarez, Leyre [1 ,2 ]
机构
[1] Univ Basque Country UPV EHU, Fac Sci & Technol, Phys Chem Dept, Macromol Chem Grp LABQUIMAC, Leioa 48940, Spain
[2] UPV EHU Sci Pk, Basque Ctr Mat Applicat & Nanostruct, BCMat, Leioa 48940, Spain
[3] IKERBASQUE, Basque Fdn Sci, Plaza Euskadi 5, Bilbao 48009, Spain
[4] Univ Basque Country UPV EHU, Dept Elect & Elect, Leioa 48940, Spain
关键词
Self-healing; Hydrogel; Conductivity; Structure frustration; POLY(ACRYLIC ACID); CHITOSAN;
D O I
10.1016/j.jcis.2024.09.090
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Flexible electronics have introduced new challenges for efficient human-machine interactions. Hydrogels have emerged as prominent materials for electronic wearable applications due to their exceptional mechanical deformability and lightweight characteristics combined in some cases with conductive properties, and softness. Additionally, bio-interphases require multisensory response to stress, strain, temperature, and self-healing capacity. To mimic these properties, this work developed interpenetrated hydrogel networks composed of chitosan (CHI) and polyacrylic acid (PAA), combined with Fe (III) ions and varying amounts of NMBA (0-0.25 %), to achieve tailored conductivity (0.8-2.5 mS/cm), self-healing, self-standing and mechanical properties (E = 11.7-110 Pa and fracture strain = 64.9-1923 %) suitable for strain sensor applications. The results revealed a significant influence of the restrictive effect on the mobility of uncrosslinked chain segments, caused by Fe ions and NMBA, on the piezoresistance (GF 2.1-1.3) and self-healing capability of the gels. Interestingly, a transparent/turbid transition, driven by microphase separation that is characteristic of systems with high dynamic interactions, was encountered for the first time in these hydrogels. This transition was
引用
收藏
页码:320 / 333
页数:14
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