POLYMER
·
2022
·
IF 4.432
Guangfeng Wu,Jiaqi Li,Qing Zhang,huixuan Zhang
Flexible strain sensors are entering human life at an extremely rapid rate depending on its excellent flexibility, comfort and bio-compatibility. However, they are expensive and inevitably break down in the application process. In order to increase the economic efficiency and prolong the service life, healing properties are given to the sensors. Here, waterborne polyurethanes with a physically cross-linked structure of chain entanglement and a multi-hydrogen bonding system were constructed to achieve a tensile strength of 30.85 MPa, an elongation at break of 314.6% and a healing degree of 100% at 60 °C. Further, using the film as the base material and the nano-silver wire as the conductive medium, a healing composite conductor with a double-layer structure was prepared. The square resistance was 75.9 Ω·sq −1 and 100% healing was achieved within 5 h under near-infrared ray and heated healing conditions. Applications in the detection of human motion are highlighted, providing the feasibility of flexible strain sensors in practical applications.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Chuanhui Gao,Yiliang Gao,Sikai Wang,Yajie Dong,Yumin Wu,Yuetao Liu,Chuanxing Wang
Intelligent bio-based self-healing polymers are advanced and sustainable materials that are widely used in military, coatings and conductive materials. However, it is a challenging task to design unsaturated polyester materials with good stretching ability, efficient self-repair ability and sensitive sensing ability. In this paper, a class of bio-based unsaturated polyester is synthesized, and the functional self-repairing unsaturated polyester material is obtained through the control and design of its structure. Firstly, a flexible self-healing polyester crosslinking network (CPUBT-UPy) was prepared by introducing 2-urea-4[1H] pyrimidinone (UPy) into the unsaturated polyester chain through chain extension reaction and using polyethylene glycol (PEG) to regulate the structure and properties of unsaturated polyester. By adjusting the molar ratio of BDO and UPy, the elongation at break of the elastomer can reach 2020.94%, and the self-repair efficiency can reach 91.33%. After 5 repair cycles, the self-repair efficiency can still reach 79.01%. A flexible conductive material was prepared by the composite of CPUBT-UPy and 15% MWCNTs-NH2, and is further assembled into a universal flexible strain sensor, which showed excellent sensitivity to finger bending, speech and frowning. Finally, unsaturated polyesters also confer potential degradability on elastomers.
研究领域:
材料科学
·
智能材料
·
可持续材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Chu,Ximing Cui,Weilun Kong,Keya Du,Liang Zhen,Liqiu Wang
The practical application of sulfur cathodes in traditional lithium–sulfur batteries has been hindered by the substantial deterioration of the sulfur electrode due to the polysulfide shuttling effect and the large volume expansion of the electrode during charge/discharge cycling. The resolving of this issue demands for a robust binder to hold the polysulfide/sulfur particles, but without causing severe disintegration of the electrode. A polar polymeric binder with high mechanical strength was designed and synthesized for use in high-performance sulfur cathodes. The complementary multiple hydrogen bonds formed in the polymeric binder significantly enhanced the adhesive strength of the binder, and buffered the dramatic volume expansion of the sulfur cathode during cycling. The strong physical and chemical interactions between the functional groups (e.g. carboxyl and tertiary amine groups) of the binder and the polysulfides effectively mitigated the shuttling effect in the Li–S batteries. As a consequence, the sulfur cathode exhibited excellent electrochemical performance at a high sulfur loading, yielding an initial discharge capacity of 627.8 mA h g −1 with sulfur loading up to 9.610 mg cm −2 at a rate of 0.2C, corresponding to an aerial capacity of 6.03 mA h cm −1 . The present work opens a new avenue for constructing a high-performance Li–S battery using a simple and effective binder.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Dongshun Deng,Xiaoxia Deng,Ke Li,Hao Fang
Development of high-efficient absorbents for ammonia (NH 3 ) to improve the quality of atmosphere and ecological environment has gained interest among scholars. Ionic liquids (ILs) with unique properties have been reported as potential solvents for NH 3 uptake to avoid many problems troubling the traditional NH 3 capture technology. In this study, six protic ethanolamine-based ILs (PILs) were synthesized for efficient and reversible NH 3 uptake, with the initial idea of constructing multiple binding sites to enhance the absorption ability for NH 3 . The physical properties and NH 3 absorption performance in these PILs were investigated and analysized on the basis of molecular structures. The results demonstrated that the preferred [EtAN][SCN] had suitable viscosity of 78.18 mPa.s and molality capacity up to 0.296 and 0.0802 g NH 3 /g PILs at 100.0 and 4.5 kPa NH 3 pressure, respectively. Such absorption ability was higher than all the reported absorbents related with ILs. 1 H NMR spectroscopy illustrated that the outstanding absorption ability was originated from multiple hydrogen-bonding interactions between acidic proton, hydroxyl group and thiocyanate with NH 3 . The absorption enthalpy of −35.5 kJ/mol was further calculated according to the absorption capacity at low NH 3 pressure under corresponding temperatures. In short, present PILs exhibited attractive absorption ability, excellent recyclability, low absorption enthalpy, and competitive selectivity of NH 3 /CO 2 . Present work can provide instructive idea for designing PILs in NH 3 recovery and separation application.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2024
·Vol. 10
·期 2
·120
·
IF 5
Jun Yang,Tengfei Dong,Jingtian Yi,Guancheng Jiang
This study addresses the performance challenges of Synthetic-Based Drilling Fluids (SBDF) in deep wells and high-temperature environments by engineering a novel multiple hydrogen-bonded crosslinked polymer, MBAH/nano-SiO2. Synthesized using methyl methacrylate (MMA), butyl methacrylate (BMA), acrylic acid (AA), N-hydroxyethyl acrylamide (HEAA), and nano-silica (nano-SiO2), the polymer improved crosslinking density, thermal properties, particle size distribution, and colloidal stability. The development of a ‘weak gel’ structure in W/O emulsions improved rheology and electrical stability (ES), with ES values reaching up to 775 V after aging at 180 °C. Moreover, the polymer’s amphiphilic structure and the synergistic effect of nano-SiO2increased emulsion film thickness and strength, further augmenting stability. The high-temperature and high-pressure filtration loss of SBDF was considerably reduced to 7.6 mL, benefiting well wall stability and reservoir damage control. This study provides crucial insights into optimizing multiple hydrogen-bonded crosslinked strategies and polymers in SBDF applications.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
He Gong,Zhifen Wang,Lin Fang,Jianhe Liao,Kai Liang,Zhiquan Wen
Natural latex films with high mechanical properties and low water-soluble protein content are hot spots of research in the rubber latex industry. In this paper, a simple method to prepare a natural latex film with high strength , low water-soluble protein content, antioxidant, antimicrobial and good biocompatibility is presented. Firstly, hydroxyapatite (HA) was organically modified using isocyanate and tannic acid , and the composite adhesive film was prepared by blending with natural rubber latex (NRL) emulsion. A filler framework network structure based on multiple hydrogen bonding interactions was constructed in the rubber matrix, which effectively limited the aggregation of fillers, significantly improved the mechanical properties of NRL adhesive films, and greatly reduced the water-soluble protein content. When the modified hydroxyapatite (mHA) was added at 1.2 wt%, the tensile strength and tear strength of mHA/NRL film increased by 32.47 % and 53.52 %, and the water-soluble protein content decreased by 92.25 % compared with pure NRL film. In addition, the modified HA endowed the NRL film with excellent antioxidant and antibacterial properties and good biocompatibility. The present work provides a new strategy for the preparation of natural latex films with multifunctionality and opens up new avenues for the application of latex in the fields of papermaking, film products, and biomedicine.
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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Xueyong Deng,Wen Zhai,Chunlin Fan,Longbo Luo,Xiangyang Liu
The terrible compressive strength is a prominent issue that restricts the broad application of organic fibers in multi-dimensional stress scenarios. Traditional strategies focus on enhancing the axial compressive performance of fibers, simultaneously improving the axial and transverse compressive properties of fibers still poses significant challenges. Inspired by the octopus's tentacles that can conduct stress in multiple directions, a novel strategy by constructing branched multi-hydrogen bonding sites structure in aramid fiber was conducted to solve the problem. The branched multi-hydrogen bonding sites constructed on nano-silica (SiO 2 –B) offer excellent dispersibility within the poly( p -phenylene-benzimidazole-terephthalamide) (PBIA) matrix. Composite fibers (PBIA-SiO 2 -B) co-mixed with SiO 2 –B and PBIA were prepared using a solution spinning technique. The results of Fourier-transform infrared spectroscopy (FTIR) and dynamic mechanical analysis (DMA) reveal that the introduction of SiO 2 –B significantly enhances the intermolecular interactions within the composite fibers, and this enhancement mechanism has been elaborately elucidated through molecular simulations. Furthermore, finite element simulations confirmed that the incorporation of branched structure exhibits enhanced stress-bearing capabilities under multi-directional stress and offers outstanding support when subjected to transverse compressive stress compared to linear molecular chains. Hence, compressive property testing revealed that the PBIA-SiO 2 -B composite fibers achieved axial compressive strengths and transverse compressive strengths of 714.3 MPa and 305.8 MPa, respectively, representing increases of 68.8 % and 26.8 % over pure PBIA fibers. Moreover, with the enhancement of transverse compressive strength, the Young's modulus and interfacial shear strength of PBIA-SiO 2 -B fibers were also increased by 7.1 % and 20.9 %, respectively.
研究领域:
材料科学
·
化学工程
·
力学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Zhongxiao Yue,Tianding Hu,Wenbo Zhao,Hongying Su,Wenlong Li,Zewen Chen,Ying Chen,Shuangjiang Li,Lihan Wang,Yi Liu,Heng Zhang,Shaoyun Shan,Yunfei Zhi
A single-component synergistic catalytic system, in which multiple active sites act on a substrate with minimal energy input and promote efficient conversion of the substrate, is considered to be the most advanced technology for simulating enzyme catalytic reaction . The design principles of this technology are the driving force behind the pursuit of cost-effectiveness in industrial production, but the challenges remain formidable. Herein, three periodic mesoporous polyamides with triazine-derived networks (PMP-TDNs) were prepared via "one-pot" polycondensation , and used as non-metallic catalysts for cycloaddition of CO 2 with epoxides without any additives to synthesis cyclic carbonates. The composition and physicochemical properties of PMP-TDNs were evaluated via different analytical methods to explore the crucial factors affecting catalytic activity. Especially, the activity of PMP-TDNs-MI with multiple hydrogen bond donor (HBD) and high-density N basic sites have been tested effectually; the results has demonstrated a superior reactivity for the cycloaddition of CO 2 and a wide range of epoxides with reusability. The kinetics and thermodynamics of cycloaddition of CO 2 with propylene epoxide by PMP-TDN S -MI were investigated, and the cooperative catalytic mechanism between the versatile active sites of catalyst was revealed based on the experimental results.
研究领域:
化学工程
·
催化科学
·
材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Yan Wang,Hao Zhang,Xianhui Dong,Na Li,Yan Wang,Yinjun Chen,Junrong Yu,Zuming Hu,Meifang Zhu
The interfacial strengthening of aramid fiber/epoxy (AF/EP) composites is primarily challenged by the significant modulus mismatch between the fibers and matrix. Furthermore, the inherent chemical inertness of AFs results in a scarcity of surface-active sites, which leads to weak interfacial interactions and inefficient stress transfer. Consequently, the overall mechanical performance of fibrous composites was severely limited. Inspired by “mussel adhesive protein”, this study designed and synthesized an amphiphilic organic molecule, dipentaerythritol-2-amino-4-hydroxy-6-methylpyrimidine-hexylisocyanate (DiPE-UPy) as the mussel protein-inspired adhesive, and employed graphene oxide (GO) nanosheets which provide high stiffness and a large specific surface area as ordered crystalline structures in proteins to construct an organic-inorganic hybrid sizing agent via a co-assembly strategy. The hybrid coating established a high-density cross-linking network between AFs and epoxy resin through multiple interactions, including quadruple hydrogen bonding and π-π stacking, thus significantly enhanced interfacial compatibility and synergistic stress transfer efficiency. The results demonstrated that the interfacial shear strength, flexural strength, and tensile strength of the modified AF/EP composites were increased by 87.47 %, 63.02 %, and 44.75 %, respectively, compared to the blank UAF/EP composite. The bio-inspired interface construction strategy provides an efficient and scalable new approach for developing high-performance AF-reinforced composites.
✓ 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）