Polymer Chemistry
·
2021
·Vol. 12
·期 7
·1014-1022
·
IF 5.582
Xuemin Li,Feng Ye,Jie Wang,Zhaobin Chen,Xiaoniu Yang
Whether running or driving, slippery surfaces have always been the enemy of speed and safety. In this work, water-retention-state-responsive polyurethane (WRSRPU) was synthesized via introducing zwitterionic sulfobetaine (SB) onto its polymer chains. With strongly hydrophilic properties, the SB segment, when its content is increased to a certain level, is able to significantly change the mechanical properties, e.g., the modulus and tribological behavior, of thus-obtained polyurethane upon exposure to wet conditions, and these properties are reversible via switching the water absorption and release behavior. Even at different humidity levels, the mechanical properties of polyurethane can change significantly with an increase in water absorption. This unique water-responsive behavior of thus-obtained polyurethane opens up a stable and proactive approach for solving the problem of skidding under wet conditions, which is a long-established troublesome issue in daily life, sports, and transportation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Duo Meng,Qiangli Zhao,Xiaoyue Cheng,Jianhua Ma,Lingyan Kong,Xinhai He,Jianwei Li
Cellulose-based water-responsive shape memory materials have received widespread attention due to their wide range of sources, high response rate, and environmental friendliness. However, fast responsive shape memory polymers (SMPs) tend to lose wet strength due to excessive hydration. Thus, it greatly limits the application range of cellulose-based water-responsive shape memory materials. To address this issue, in this work, a cellulose nanofiber (CNF) nanocomposite membrane with high water-induced shape memory properties was successfully prepared containing polyvinyl alcohol (PVA) and lignin (LIG). Citric acid (CA) was used as the cross-linking agents. Changes in the content ratio of CNF to PVA and the amount of LIG added will change the crosslinked network structure of the CA/LIG/PVA/CNF membrane, leading to changes in the microstructure, water responsiveness and mechanical properties of the membrane. With the addition of LIG, the fracture surface of the microstructure will orient along longitudinal direction and form a densely packed layered structure. The increase content ratio of CNF to PVA can improve the compatibility of each component. The water-induced shape memory recovery rate of the nanocomposite can reach 100% within 4 s. In the dry state, the maximum tensile strength of the film can reach 138.0 MPa, and the maximum tensile modulus of the film can reach 9.0 GPa. After wet swelling, the highest tensile strength and tensile modulus are up to 60 MPa and 0.7 GPa, respectively. The CNF nanocomposite film has excellent performance in blocking ultraviolet and the transmittance value of the membrane is below 8% in the ultraviolet region of 200–400 nm. Hence, the resultant CA/LIG/PVA/CNF membrane will have potential applications in smart science and the provide a framework for developing a cellulose-based shape memory polymer.
研究领域:
材料科学
·
生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Fei Long,Xinwen Zhang,Xuan Li,Fei Sun,Tong Zhou,Lei Liu
Preventing metal corrosion has usually been associated with water-repellent coatings that inhibit the penetration of aggressive chloride ions. Contrary to this conventional wisdom, we engineered ultrathin superhydrophilic zwitterionic hydrogel brushes rooted in a nanoporous anodic aluminum oxide (AAO) substrate that effectively hampered the adsorption of hydrated chloride ions (Cl–·H2O) on the Al alloy surface. The hydrogel brush coating enhanced corrosion resistance by 3 orders of magnitude, with corrosion current density declining from 1.518 to 1.567 × 10–3 μA cm–2. Despite suffering from long-term salt-spaying tests, zwitterionic hydrogel brush coating retained 2 orders of magnitude of corrosion resistance. Direct Raman spectroscopic evidence manifested that interfacial water comprised both highly ordered hydrogen-bonded water and disordered water containing hydrated Cl– ions. Under the hydration effect of zwitterionic hydrogel brushes, an interfacial disordered water structure dynamically transformed into a hydrogen-bonded water film. We correlated the structure and quantities of interfacial water with the corrosion current density and chloride adsorption. Hydrogen-bonded water improved by zwitterionic hydrogel brushes weakened the affinity and adsorption of hydrated Cl– ion water on the oxide film, resulting in excellent corrosion protection. Therefore, employing localized hydration tuning strategies, these findings are anticipated to generally empower ordered interfacial water to enhance metal corrosion resistance through precise interfacial engineering.
研究领域:
材料科学
·
腐蚀与防护
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Yazhou Duan,Weihan Tao,Yinchun Fang,Xianfeng Wang
Textiles-based wearable sensors with colorimetric sensing can transform external stimuli to visible color changes, which are ideal for the development of low-cost wearable sensors. Among them, textile-based water-response structural color colorimetric sensors have received wide attention for their pollution-free and eco-friendly characteristics. In this research, poly (styryl-methyl methacrylate-[3-(methylacrylamide) propyl] trimethyl ammonium chloride) (P(St/MMA/MAPTMA)) microspheres with hydrophilic quaternary ammonium salt groups were prepared, which were atomized and deposited on textile fabrics anticipating to prepare textile-based water response colorimetric sensors. P(St/MMA/MAPTMA) microspheres with different particle diameters were obtained by adjusting the mass ratios of the monomers, which were assembled on the fabrics to form different structural colors. These structural colors showed fast water response property to change color when they were wetted by water within 2 s. The P(St/MMA/MAPTMA) microspheres structural colors on the fabrics can return to their original structural colors after drying showing the reversible water responsiveness, which have the promising application prospect of water-response colorimetric sensors. Moreover, the antibacterial rates of these structural colors on fabrics were greater than 98 % showing excellent antibacterial properties. This research shows that this textile-based water-response structural color colorimetric sensors exhibit potential application prospects in the field of water content monitoring, such as the diapers for monitoring the amount of baby’s urine, or the clothing for monitoring the amount of human sweat.
研究领域:
材料科学
·
传感器与传感技术
·
可穿戴电子
·
光子材料
·
智能纺织品
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）