ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 10
·2009869
·
IF 18.808
Wu Bin Ying,Guyue Wang,Zhengyang Kong,Chen Kai Yao,Yubin Wang,Han Hu,Fenglong Li,Chao Chen,Ying Tian,Jiawei Zhang,Ruoyu Zhang,Jin Zhu
Polymeric elastomers play an increasingly important role in the development of stretchable electronics. A highly demanded elastic matrix is preferred to own not only excellent mechanical properties, but also additional features like high toughness and fast self-healing. Here, a polyurethane (DA-PU) is synthesized with donor and acceptor groups alternately distributed along the main chain to achieve both intra-chain and inter-chain donor-acceptor self-assembly, which endow the polyurethane with toughness, self-healing, and, more interestingly, thermal repair, like human muscle. In detail, DA-PU exhibits an amazing mechanical performance with elongation at break of 1900% and toughness of 175.9 MJ m −3 . Moreover, it shows remarkable anti-fatigue and anti-stress relaxation properties as manifested by cyclic tensile and stress relaxation tests, respectively. Even in case of large strain deformation or long-time stretch, it can almost completely restore to original length by thermal repair at 60 °C in 60 s. The self-healing speed of DA-PU is gradually enhanced with the increasing temperature, and can be 1.0–6.15 µm min −1 from 60 to 80 °C. At last, a stretchable and self-healable capacitive sensor is constructed and evaluated to prove that DA-PU matrix can ensure the stability of electronics even after critical deformation and cut off.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 28
·期 4
·373-381
·
IF 1.758
Wu Xudong,Huang Jingyu,Yu Shuhui,Ruan Panpan,Sun Rong,Wong Ching-Ping
Dielectric materials with self-healing property after the occurrence of detrimental events such as tearing or scratch are highly desired, which guarantees reliability and lifetime of the electric and electronic systems. Here, a self-healing covalently bonded titanium dioxide/polyurethane (TiO 2 /PU) nanocomposite with enhanced dielectric constant was prepared by in-situ polymerization based upon Diels-Alder reaction. The PU prepolymer was prepared from TiO 2 , poly(tetramethylene glycol) and 4,4-diphenylmethane diisocyanate. Then the linking between the prepolymer and Diels-Alder adducts of bifunctional maleimide blocked by furfuryl alcohol was carried out. The in-situ polymerization method allows the TiO 2 filler, the PU polymer matrix, and the DA healing portion to be tightly connected, resulting in a stable nanocomposite system. Due to the reversibility of covalent bonds, the TiO 2 /PU nanocomposites exhibited thermal self-healing properties after being cut. The dielectric constant and loss, mechanical properties can be effectively restored to their original state after damage.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 3
·e70140
·
IF 3.4
Xianning Wang,Runqi Zhang,Lujia Xuan,Mengmeng Yu,Jianqing Mao,Gang Cheng,Jieqiong Yan,Hongzhen Wang
Covalent adaptable networks offer a viable approach for producing recyclable rubber materials. Nevertheless, the intricate synthesis process and insufficient mechanical strength limit their commercialization applications. In this study, the reinforced, thermal-healing, and recyclable chitosan/ethylene propylene diene rubber (CEF-CS) was synthesized using a solid-phase blending process via the Diels-Alder (D-A) reaction. Furfural modified chitosan (F-CS) was included as a reinforcing filler and dynamic cross-linking point into the network formed via the D-A reaction. The influence of F-CS content on the mechanical, thermomechanical, and thermal repair characteristics of CEF-CS composites was examined. The results showed that the CEF-CS composites exhibited certain mechanical strength and dependable repair capabilities. As the F-CS content increased, the tensile strength of CEF-CS composites initially rose and subsequently declined, reaching a peak of 5.1 MPa, which was 5.1 times more than the control without F-CS. The first healing efficiency of tensile strength exceeded 70%, whereas the second healing efficiency was above 60%. Moreover, the simple preparation procedure and enhanced mechanical strength facilitate the commercial utilization of recyclable rubber materials, which is crucial for addressing the environmental pollution issue associated with rubber materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 48
·20642-20649
·
IF 0
Jinhui Li,Guoping Zhang,Libo Deng,Songfang Zhao,Yongju Gao,Kun Jiang,Rong Sun,Chingping Wong
Covalently bonded graphene oxide/polyurethane (GO/PU) composites with significant reinforcement and thermally healable properties were developed via in situ polymerization based on Diels–Alder (DA) chemistry. The PU prepolymer was prepared with GO, 4,4-diphenylmethane diisocyanate, and poly(tetramethylene glycol) and blocked by using furfuryl alcohol firstly. Then the prepolymer was cross-linked by using bifunctional maleimide via DA chemistry. SEM shows that the GO was dispersed uniformly in the PU matrix. The DA and retro-DA reactions were characterized by Fourier transform infrared spectroscopy and differential scanning calorimetry separately. Tensile tests showed that with the incorporation of 0.1 wt% of GO, the tensile modulus of GO/PU composites increased from 9.80 MPa to 21.95 MPa, and the tensile strength and elongation at break of the GO/PU composites increased by more than 367% and 210%, respectively. Furthermore, the composites had thermally healable ability which was inspected by using an atomic force microscope and the strain–stress test. The healing efficiency of 78% on average was achieved which was determined by the recovery of breaking stress and a healing mechanism was tentatively proposed. Therefore, the covalently bonded self-healing GO/PU composites could be used as smart materials and structural materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Xin-Yu Xu,Nan Hu,Zhu-Kang Qian,Qing Wang,Li-Wu Fan,Xin Song
In situ thermal desorption (ISTD) provides an efficient solution to remediation of soil and groundwater contaminated with nonaqueous phase liquids (NAPLs). Establishing a relationship between the subsurface temperature rise and NAPL removal is significant to reduce energy consumption of ISTD. However, the co-boiling phenomenon between NAPL and water poses a great challenge in developing this relationship due to the nonequilibrium heat and mass transport effects. We performed a systematic experimental investigation into the local temperature rise patterns at different distances from a NAPL pool and under different degrees of superheat by selecting four representative NAPLs (i.e., trichloroethylene, tetrachlorethylene, n-hexane, and n-octane) according to their density and boiling point relative to water. The patterns of temperature rise indicated that the underground temperature field can be divided into three zones: the zone of local thermal equilibrium, the nonequilibrium zone affected by co-boiling, and the zone unaffected by co-boiling. We developed a pattern-recognition-based approach, which considers the effects of local heat and mass transport to establish a qualitative correlation between the temperature rise and NAPL removal. Our results give deeper insights into the understanding of subsurface temperatures in ISTD practice, which can serve as the guideline for more accurate and sustainable remediation.
研究领域:
环境科学
·
土壤修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Chang Cong,Jixiao Wang,Zhan Wang,Guangyu Xing,Zhi Wang
Epoxy vitrimers with thermal-healing ability are widely studied to prolong the service life of materials. But the conventional preparation and healing strategy, involving external catalysts, preheating, hot press or/and heating the entire coating, are not applicable for the large-scale applications. In this work, a room-temperature brushable oxidized carbon black (OCB)/epoxy vitrimer composite based on dynamic transesterification reaction with excellent protective performance and localized photothermal-healing was prepared by solvent method. No external catalysts, preheating and hot press was needed in the preparation process. The experimental results demonstrate that the composite coatings exhibited an excellent metal protective performance. The effective non-contact local photothermal-healing can be achieved in 20 Min., and the scratch width can apparently narrow over 95 % and the impedance moduli of the composite coatings can be recovered from 263 Ω·cm 2 to above 10 8 Ω·cm 2 . The OCB/epoxy vitrimer composite coating, combining ideal metal protective performance with non-contact local photothermal-healing performance, has great promise for many practical applications in large-scale, such as metal protection and solar-energy collector.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Chang Cong,Jixiao Wang,Guangyu Xing,Zhan Wang,Sicheng Yuan,Zhi Wang
Polymeric coatings , widely used in large-scaled outdoor applications including solar energy collection, metal protection and so on, are limited by short service life caused by degradation and structural damage due to constant exposure in air and external force. Here, oxidized carbon black (OCB)/epoxy vitrimer (EV) composite without catalysts, dispersants and pre-heating was prepared by facile solvent mixing method. The addition of OCB improved the stress relaxation rate of the composite and endowed high solar absorptance (α) at 94.57% and solar thermal efficiency (η) at 93.28%. The efficiency of remote and local photothermal-stimulated healing for micro scratches of the composite coating was as high as 95.08%. And the macroscopic damage repairing which was rarely reported can be about 100% by a novel photothermal patching method. Meanwhile, the composites also have behaviors of shape memory, reusability and ion transfer barrier performance. Overall, based on the advantages of facile preparation, cheap raw materials, high solar absorptance and solar thermal efficiency and excellent remote and local healing efficiency, the OCB/EV composite coatings have potential applications in solar energy harvesting and provides a new strategy for the local and contactless repair of polymeric coatings used in outdoor applications such as solar-energy collector, solar absorption systems and metal protection, especially for the repair of the macroscopic damage.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Wan Huang,Lifeng Cao,Runlei Ge,Ziren Wan,Di Zheng,Fangzhou Li,Guanghe Li,Fang Zhang
The coupling of thermal remediation with microbial reductive dechlorination (MRD) has shown promising potential for the cleanup of chlorinated solvent contaminated sites. In this study, thermal treatment and bioaugmentation were applied in series, where prior higher thermal remediation temperature led to improved TCE dechlorination performance with both better organohalide-respiring bacteria (OHRB) colonization and electron donor availability. The 60 °C was found to be a key temperature point where the promotion effect became obvious. Amplicon sequencing and co-occurrence network analysis demonstrated that temperature was a more dominating factor than bioaugmentation that impacted microbial community structure. Higher temperature of prior thermal treatment resulted in the decrease of richness, diversity of indigenous microbial communities, and simplified the network structure, which benefited the build-up of newcoming microorganisms during bioaugmentation . Thus, the abundance of Desulfitobacterium increased from 0.11 % (25 °C) to 3.10 % (90 °C). Meanwhile, released volatile fatty acids (VFAs) during thermal remediation functioned as electron donors and boosted MRD. Our results provided temperature-specific information on synergistic effect of sequential thermal remediation and bioaugmentation, which contributed to better implementation of the coupled technologies in chloroethene-impacted sites.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Shuolei Wang,Ziyue Zhang,Rui Wang,Xiaojian Jiang,Hongyu Gao,Shi Xu,Naharullah Jamaluddin,Chen Qian,Yaqin Fu,Yubing Dong
Flexible wearable strain sensors have attracted much attention in the field of health monitoring due to their advantages of simple preparation process and good comfort. However, in daily use, factors like friction, sweat during exercise, or harsh environments such as rain may lead to the failure of the strain sensor. Therefore, this study designed a strain sensor that is waterproof, wear-resistant, resistant to various corrosive fluids and has biodegradation characteristics. The strain sensor was prepared by using carbon nanotubes (CNTs) with high length-to-diameter ratio as conductive filler and environment-friendly polybutylene terephthalate (PBAT) as matrix and packaging materials. The CNTs/PBAT strain sensor has reversible and repeatable resistance at 5 %–30 % strain, stable cycle durability (2500 cycles), and low carbon nanotube content (0.45 %). Moerover, it has thermal repair properties that can eliminate creep caused by long-term use of polymers and extend their service-life. In addition, the PBAT/CNTs/PBAT strain sensor operates safely within the safe voltage range of the human body, can monitor body movement in air and water, and has a wide range of applications in wearable sports health.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yujie Jia,Luzhi Zhang,Minglin Qin,Ya Li,Shijia Gu,Qingbao Guan,Zhengwei You
Self-healable polyurethanes (PUs) containing reversible dynamic bonds have been widely recognized and rapidly developed in recent years. Because the self-heal capability and mechanical properties of materials are mutually exclusive in nature, it is still a formidable challenge to design a highly efficient self-healable and robust PUs, especially in wearable electronics field. Herein, a series of self-healable thermosetting PU elastomer based on widely used phenolic urethane bond was prepared to achieve above requirements. In order to investigate the effect of introducing different bisphenol chain extenders into the hard segment domain on the dissociation temperature of phenolic carbamate bond, both bisphenol A (BPA) and bisphenol AF (BPAF) were used to synthesize thermosetting PU elastomers (PU-BPA and PU-BPAF). The healing efficiency of PU-BPA was 95% with a thermal treatment at 100 °C for 1 h, and its initial dissociation temperature was 90 °C. Due to the presence of trifluoromethyl (-CF 3 ) group, the thermal self-healing efficiency of PU-BPAF was improved, which could be completely healed (100%) at the same conditions and its initial dissociation temperature was reduced to 80 °C. PU-BPAF were used to prepare a self-healable triboelectric nanogenerator (SH-TENG) to convert mechanical movements into electrical energy that can be applied to next-generation wearable devices.Their measured open circuit voltage, short circuit current, short-circuit charge quantity were 240 V, 2.20 μA, 20 nC, respectively. In addition, the PU-BPAF based SH-TENG exhibited better self-cleaning ability (83%) than that of PU-BPA elastomer, which was attributed to the introduction of trifluoromethyl reducing the surface energy of the material. Consequently, PU-BPAF showed great potentials as a self-healable and stretchable conductor to be applied to flexible electronic devices.
研究领域:
材料科学
·
高分子化学
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Shuolei Wang,Zhonggui Zhang,Zhao Li,Ziyue Zhang,MD. Zahidul Islam,Xiaojian Jiang,Hongyu Gao,Shi Xu,Yubing Dong
The sensor fabricated from high-molecular polymer is soft, lightweight, and biocompatible; however, traditional high-molecular polymers suffer from viscoelasticity and poor cycle stability. To address these issues, it is essential to develop flexible matrix materials that can overcome viscoelasticity, ensuring high sensitivity and long-term use under large strains for next-generation wearable intelligent devices. In this study, ethylene-vinyl acetate (EVA) with a shape memory effect was utilized as the substrate for a flexible sensor，the shape memory effect of EVA can eliminate the residual strain generated by each long time of use to improve its service life. A polydopamine@reduced graphene oxide (PDA@RGO)/EVA fiber flexible strain sensor was fabricated through melt extrusion, swelling ultrasound, and in-situ polymerization techniques. The resulting sensor exhibits high sensitivity (gauge factor=1801.21), a wide strain detection range (strain = 193 %), and excellent stability and durability (2000 cycles). Notably, the PDA@RGO/EVA fiber flexible strain sensor demonstrates exceptional dual thermal and light repair functions, with light repair achieving a repair speed of 5 seconds, 100 % electrical performance repair efficiency, and perfect consistency in relative resistance response before and after repair. Furthermore, the PDA@RGO/EVA strain sensor can monitor finger and wrist movements in real-time with high accuracy, highlighting its significant potential application in the wearable technology field.
研究领域:
材料科学
·
生物医学工程
·
可穿戴技术
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2018
·Vol. 2019
·期 1
·51-58
·
IF 2.507
Hangle Guo,Tongguang Ge,Jian Lv,Changlin Du,Jian Zhou,Zhicheng Liu,Zile Hua
Graphical A facile and eco-friendly mesoporogen-free steam-assisted crystallization strategy has been developed for the synthesis of hierarchically structured ZSM-5 zeolites with superior MTP catalytic performance, and a new “in situ alkali etching-hydrothermal restoring“ mechanism is discussed. A series of hierarchically structured ZSM-5 zeolites (ZSM-5 HSZs) with a Si/Al ratio of about 200 have been successfully synthesized in the absence of additional mesoporous agents. XRD, N 2 sorption isotherms, SEM, TEM and NH 3 -TPD results showed that the obtained HSZs materials possess high crystallinity, interconnected micro/mesoporous structures and similar total acid amounts. Meanwhile, in the methanol-to-propylene (MTP) reaction, compared to the microporous counterpart, all synthesized ZSM-5 HSZs demonstrated superior performance benefitting from their hierarchical porous structures. Interestingly, 27 Al MAS NMR and Py-FTIR results confirmed the inter-transformation of framework and extra-framework Al species with the extension of materials crystallization duration and consequently the variation of materials surface acidity. As a result, the optimized catalyst achieved the highest initial propylene selectivity of 54.4 % and the longest catalyst lifetime ( t 90 ) of 175 h under the weight hourly space velocity (WHSV) of 1.0 g g –1 h –1 . Moreover, a new “in situ alkali etching-hydrothermal restoring“ mechanism has been proposed to elucidate the structural evolution of here reported high-silica ZSM-5 HSZs during the synthesis.
研究领域:
材料科学
·
催化化学
✓ 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）