Oxidation pattern of curdlan with TEMPO-mediated system

Tang, Ru‐Ling; Hao, Jie; Zong, Ruijie; Wu, Fangxia; Zeng, Yangyang; Zhang, Zhenqing

doi:10.1016/j.carbpol.2017.12.080

Cited by 15 publications

(1 citation statement)

References 29 publications

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“…According to our previous research, the strategy of oxidizing hydroxyl groups to carboxyl groups can enhance the solubility of a polysaccharide. Unfortunately, the traditional oxidation method using the TEMPO system causes significant pollution, high costs, and low efficiency . If the evolved Fenton reaction, a green, low-cost, facile, and sustainable approach, can oxidize hydroxyl groups in curdlan with high carboxyl contents, this novel oxidized curdlan (OC) is expected to address multiple challenges (PAA sustainable accelerators, electrostatic interactions, and hybrid physical and chemical cross-linker) simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Rapid Polymerization of Intrinsic Conducting PAD/OC Hydrogels with a Self-Adhesive and Sensitive Sensor for Outdoor Damage Repair and Detection

Liu,

Chen,

Zhang

2024

ACS Appl. Mater. Interfaces

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Intrinsic conducting hydrogels fabricated in situ at low temperatures with self-adhesive properties and excellent flexibility hold significant promise for energy applications and outdoor damage repair. However, challenges such as low polymerization rate and self adhesion, insufficient ionic conductivity, inflexibility, and poor stability under extreme cold conditions have hindered their utilization as high-performance sensors. In this study, we designed an intrinsic conducting hydrogel (PADOC) composed of acrylic acid, acryloyloxyethyltrimethylammonium chloride, N,N′-methylenebis(2-propenamide), self-fabricated oxidized curdlan (OC), and a water/glycerol binary solvent. The novel hydrogel exhibited rapid gelation (30 s) at 0 °C facilitated by the promotion of OC, without the need for external energy input. Our findings from FT-IR, NMR, XPS, XRD, EPR spectra, MS, and DSC analyses revealed that OC underwent selective oxidation via the evolved Fenton reaction at 30 °C, serving as bioaccelerators for PAD polymerization. Due to OC's reductive structure and increased solubility, the reaction activation energy of the PAD polymerization reaction significantly reduced from 103.2 to 54.4 kJ/mol. PADOC ionic hydrogels demonstrated an electrical conductivity of 1.00 S/m, 0.7% low hysteresis, 39.6 kPa self-adhesive strength, and 923% strain-at-break and kept even at −20 °C owing to dense hydrogen and ionic bonds between PAD and OC chains. Furthermore, PADOC ionic hydrogels exhibited antifatigue properties for 10 cycles (0−100%) due to electrostatic interactions and hydrogen bonding. Remarkably, using a selfdesigned device, the rapid polymerization of PADOC effectively repaired copper pipeline leakage under 86 kPa pressure and detected 1% strain variation as a strain sensor. This study opens a new avenue for the rapid gelation of self-adhesive and flexible intrinsic conducting hydrogels with robust sensor performance.

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Section: Introductionmentioning

confidence: 99%