JOURNAL OF POWER SOURCES
·
2010
·
IF 3.792
Xinbing Chen,Pei Chen,Zhongwei An,Kangcheng Chen,Kenichi Okamoto
A series of crosslinkable sulfonated poly(arylene ether ketone)s (SPAEKs) were synthesized by copolymerization of 4,4′-biphenol with 2,6-difluorobenzil and 5,5′-carbonyl-bis(2-fluorobenzene-sulfonate). A facile crosslinking method was successfully developed, based on the cyclocondensation reaction of benzil moieties in polymer chain with 3,3′-diaminobenzidine to form quinoxaline groups acting as covalent and acid–base ionic crosslinking. The uncrosslinked and crosslinked SPAEK membranes showed high mechanical properties and the isotropic membrane swelling, while the later became insoluble in tested polar aprotic solvents. The crosslinking significantly improved the membrane performance, i.e., the crosslinked membranes had the lower membrane dimensional change, lower methanol permeability and higher oxidative stability than the corresponding precursor membranes, with keeping the reasonably high proton conductivity. The crosslinked membrane ( C-B4 ) with an ion exchange capacity of 2.02 mequiv. g −1 showed a reasonably high proton conductivity of 111 mS cm −1 with a low water uptake of 42 wt% at 80 °C. C-B4 exhibited a low methanol permeability of 0.55 × 10 −6 cm 2 s −1 for 32 wt% methanol solution at 25 °C. The crosslinked SPAEK membranes have potential for PEFC and DMFC applications.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 6
·1-11
·
IF 3.097
Wang Wei-Yu,Zha Xiang-Jun,Bao Rui-Ying,Ke Kai,Liu Zheng-Ying,Yang Ming-Bo,Yang Wei
Dynamics of exchange within vitrimer networks are influenced by mobility of the chemical species involved in the exchange reaction, then it can be affected by the crystalline phase when boronic ester bond is introduced into the thermoplastic elastomers with crystalline phase as physical cross-links. In this work, the dynamic dioxaborolane cross-links were introduced into commercial poly(ethylene-α-octene) (POE) with crystalline phases as physical cross-links to prepare POE vitrimers. The results of stress relaxation show that relaxation time (τ) follows an Arrhenius law with the temperature at the melting range for not only POE vitrimers and thermally treated POE vitrimers with dynamic cross-links, but also neat POE with purely physical cross-links. The liquid-to-solid transition temperature can raise to 35.3 °C for POE vitrimers from -42.9 °C of the thermally treated one, due to the constrained mobility by residual crystalline phases. The resulted POE vitrimers maintain a stress at break of higher than 27.5 MPa and an elongation at break of higher than 800% at room temperature. With the temperature increasing, the crystal melting induced weakening of the physical cross-linking in POE decreases the strength, but the storage modulus and the stress at 300% and 500% elongation of POE vitrimers are improved. The properties of POE vitrimers can almost keep unchanged after recycling or healing. All these results show that the introduction of reversible boronic ester bonds is a promising strategy to improve the performances and recyclability of physically cross-linked POE materials.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 46
·14581-14587
·
IF 6.641
Shengping Dai,Shuai Wang,Xu Dong,Xiuzhu Xu,Xiaoting Cao,Yuewen Chen,Xiaoshuang Zhou,Jianning Ding,Ningyi Yuan
Self-healing hydrogels are a new type of functional material that have been widely used in many fields. Although various self-healing hydrogels have been reported, the simultaneous achievement of transparency, toughness, good recovery, and superior self-healing properties is still challenging. Here, we designed a new hydrogel with a dual physical and chemical triple crosslinked network. The triple crosslinked network hydrogel after freeze–thaw cycling exhibited higher stability, toughness and better tensile properties than those provided by the dual crosslinked network in the as-prepared hydrogel. In addition, the triple crosslinked network structure provided reliable recovery performance and superior self-healing ability without requiring external stimuli. With the combination of high transparency, toughness, good recovery, and self-healing properties, we demonstrated the applicability of the hydrogel in resistance and capacitance sensors, which can be applied to a wide range of human motion monitoring and intelligent wearable devices.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
·
2016
·Vol. 104
·期 11
·2712-2722
·
IF 3.263
Liming Ge,Yongbin Xu,Weijie Liang,Xinying Li,Defu Li,Changdao Mu
Genipin is an ideal cross-linking agent in biomedical applications, which can undergo ring-opening polymerization in alkaline condition. The polygenipin can create short-range and long-range intermolecular cross-linking between protein chains. In this article, the polygenipin with different degree of polymerization was successfully prepared and used to fix gelatin composite materials. The short-range and long-range cross-linking effects of polygenipin were systematically studied. The results show that the composite materials present porous structure with tunable pore sizes in the gel state, which can be easily controlled by adjusting the degree of polymerization of polygenipin. Long-range cross-linking can increase the pore size of the gel. However, during the drying process, the composite films cross-linked by polygenipin with higher degree of polymerization shrank to smaller size to create more compact structure, resulting in the improvement of water resistance properties, thermal stability, tensile strength, and darker color for the composite films. It is interesting that the composite films can partly swell to the original gel structure when in contact with water and saturated water vapor. All the composite films have excellent barrier properties against UV light. However, the compatibility of gelatin and polygenipin is reduced when the degree of polymerization of polygenipin increases to a certain extent, which will result in the formation of phase separation structure. The obtained composite films are ideal candidates for food and pharmaceutical packaging materials. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 2712–2722, 2016.
研究领域:
生物医学工程
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 2
·375-381
·
IF 4.872
Yue Wang,Wenjun You,Yifan Song,Xiangxin Li,Dengli Qiu,Mengjiao Cheng,Feng Shi
Due to the noncovalent interactions between the layers of polyelectrolyte films, the layer-by-layer assembled multilayered films always face the challenge of low film stiffness and chemical stability under extreme conditions. To handle this issue, we incorporated 4,4′-diazostilbene-2,2′-disulfonic acid disodium salt (DAS) as a crosslinker and subsequently photocrosslinked the layers of a poly(allylamine hydrochloride)/catalase multilayered film. The results showed that DAS could stabilize the prepared film in a manner similar to the traditional cross-linker glutaraldehyde. The multilayered film showed good biocompatibility with a positive effect on cell proliferation. Therefore, by using the commercially available DAS crosslinker, we provide a synthesis-free and biocompatible method to stabilize polyelectrolyte multilayers for broad and significant applications in biological fields, e.g., varying crosslinking density to adjust the mechanical strength of biomaterials, stabilizing susceptible biofilms, or introducing functional groups onto cell membranes.
研究领域:
材料科学
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生物医学工程
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细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2011
·Vol. 68
·期 5
·1369-1386
·
IF 1.215
Chen Pei,Chen Xinbing,An Zhongwei
A series of covalently and ionically crosslinked sulfonated poly(arylene ether ketone)s (SPAEKs) were prepared via the cyclocondensation reaction of crosslinkable SPAEKs with 3,3′-diaminobenzidine to form quinoxaline groups, where crosslinkable SPAEKs were synthesized by copolymerization of 4,4′-biphenol with 2,6-difluorobenzil, 4,4′-difluorobenzophenone, and 5,5′-carbonyl-bis(2-fluorobenzene sulfonate). The SPAEK membranes had high mechanical properties and the isotropic membrane swelling. The covalent and ionical crosslinking significantly improved the membrane performance, i.e., the crosslinked membranes showed the lower membrane dimensional change, lower methanol permeability, and higher oxidative stability than the corresponding uncrosslinked membranes, with keeping the reasonably high proton conductivity. The crosslinked membrane ( CK3 ) with measured ion exchange capacity of 1.62 mequiv g −1 displayed a reasonably high proton conductivity of 110 mS/cm with water uptake of 33 wt% at 80 °C, and exhibited a low methanol permeability of 1.7 × 10 −7 cm 2 s −1 for 32 wt% methanol solution at 25 °C. The covalently and ionically crosslinked SPAEK membranes have potential for polymer electrolyte membrane fuel cells and direct methanol fuel cells.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 24
·4615-4622
·
IF 7.571
Yinlei Lin,Zexian Ou,Shuoqi Wang,Sheng Sun,Xiaoting Liu,Xinyan Song,Haichen Zhang,Huawen Hu,Guangji Li
While it is challenging to simultaneously achieve both high mechanical performance and self-healing ability within one polymer hydrogel network, we, herein, synthesized a novel class of hydrogels based on a combination of chemical and dual non-covalent crosslinks via micellar polymerization of 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, end-capped by 2-hydroxyethyl methacrylate (IPDI-HEMA), with acrylamide (AM). The prepared hydrogels were demonstrated to possess a tensile elongation at a break of at least 1900%, a fracture energy of 138.4 kJ m−3, and remarkable self-healing behaviors (e.g., a strong self-healing ability achieved at ambient temperature without the need for any stimulus or healing agent). The multiple crosslinks developed in this study for one polymer hydrogel network are significant steps to construct the desired functional hydrogels with excellent self-healing and mechanical properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 37
·6221-6227
·
IF 4.872
Fu-Kuan Shi,Ming Zhong,Li-Qin Zhang,Xiao-Ying Liu,Xu-Ming Xie
Acrylamide (AM) and a small amount of stearyl methacrylate (C18) hydrophobic monomer copolymerize to graft on the surface of vinyl hybrid silica nanoparticles (VSNPs), forming nanobrush gelators, thereby constructing ternarily crosslinked nanocomposite physical hydrogels (TC-NCP gels). The TC-NCP gel is composed of a single network ternarily crosslinked by hydrogen bonds and hydrophobic interactions among the grafting polymer chains as physical cross-linking points and thus the polymer grafted VSNPs as analogous covalent crosslinking points. Under stretching, the physical crosslinking points successively break to gradually dissipate energy and then recombine to homogenize the network. During the stretching process, the polymer chains grafted VSNPs can homogenize the stress distribution as transferring centers. The synergy of the ternary crosslinking points leads the TC-NCP gels to dissipate more energy and redistribute the stress more effectively when compared with hydrogels dually crosslinked by both hydrogen bonds and VSNPs as analogous covalent crosslinking points (without hydrophobic interactions) and by both hydrogen bonds and hydrophobic interactions (without VSNPs). As a result, the TC-NCP gels demonstrate remarkably improved mechanical properties, including tensile strength of 256 kPa, stretch ratio at break of 28.23 and toughness of 1.92 MJ m−3 at a water content of 90%. Pure shear test shows that the TC-NCP gel is able to resist notch propagation by micro-crack development from the notch tip to the whole gel network and has a high tearing energy of 1.21 × 104 J m−2. The dynamic nature of the network endows the TC-NCP gels with excellent self-healing ability. The results evidently indicate that constructing a single gel network with hierarchical crosslinking points is a versatile method to fabricate robust hydrogels.
研究领域:
材料科学
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生物材料
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高分子化学
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产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2020
·Vol. 60
·期 5
·1054-1065
·
IF 1.917
Hui Peng,Min Lu,Hao Wang,Zhongzhou Zhang,Fucheng Lv,Mingjun Niu,Wanjie Wang
The properties and structure of silane crosslinked polypropylene (PP)/ethylene propylene diene monomer (EPDM) elastomer blends had been carried out. Fourier transform infrared spectroscopy and gel content tests were employed to evaluate the crosslinking reaction of PP/EPDM blends. Crosslinking efficiency of PP/EPDM blends was investigated using thermogravimetric analysis, differential scanning calorimeter, dynamic mechanical analysis, dynamic rheology, and tensile testing. Tan δ curves of silane crosslinked PP/EPDM blends exhibited an obvious “gel point” originated from the formation of dynamic crosslinking network. The blend corresponding to the “gel point” presented comprehensively improved mechanical properties. These results demonstrated that characteristic rheological parameters showed close correlations with key mechanical properties of silane crosslinked PP/EPDM blends. Scanning electron microscopy images illustrated that crosslinking had remarkably changed the morphologies of PP/EPDM blends. The large deformation mechanism of these blends had been suggested.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiaqiang Wang,Donglin Yang,Bingxiao Feng,Meng Xiao,Hengjun Gai,Tingting Huang,Yu Zhou,Hongbing Song
Considering the environmental problems caused by oily wastewater, how to realize oil-water separation has attracted extensive attention from researchers. Herein, a series of hypercrosslinked poly(ionic liquid)s (HCPILs) were fabricated by using dimethoxymethane as an external crosslinking agent combined with different auxiliary crosslinking agents to “weave” the ionic liquid of 1,3-dibenzylimidazolium chloride for oil-water separation. The hydrophilicity and hydrophobicity of HCPL can be adjusted by changing different auxiliary crosslinking agents. When using aniline as an auxiliary crosslinking agent, the resulting HCPIL-A2 with approximately 5500 L/m 2 ·h of water flux exhibits super hydrophilicity-oleophobicity, its static water contact angle and underwater oil contact angle are close to 0° and 132°, respectively. When using benzyl alcohol instead of aniline, the obtained HCPIL-B2 exhibits good lipophilicity and hydrophobicity. Its static water contact angle and underwater oil contact angle are close to 126° and 0°, respectively. And its oil fluxes of chloroform and carbon tetrachloride are approximately 7645 and 7241 L/m 2 ·h, respectively. However, when using toluene instead of aniline, the obtained HCPIL-C2 exhibits hydrophilicity-lipophilicity and can’t separate the oil-water mixtures. Moreover, HCPILs show permanent pore structure, good stability, and environmental friendliness due to their high degree of crosslinking are constructed. Their loose surface roughness can realize the separation of the oil-water mixture by gravity. Therefore, the designed new materials can selectively remove water or oil mixture. Efficient separation of crude oil and seawater mixture will provide new ideas for future environmental problems such as offshore oil spills.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Weina Deng,Weiming Liu,Hai Zhu,Liang Chen,Haiyang Liao,Han Chen
With the expansion of portable devices, high-security and flexible energy storage technologies are gaining popularity. However, because of the use of poisonous, flammable, and unstable organic liquid electrolytes in commercial lithium-ion batteries, they cannot provide sufficient protection for the safety and long-term life of portable devices. A thiolate click reaction and ion interaction are used to successfully create a double cross-linking ionogel electrolyte (DC-Ionogel) by sealing 1-ethyl-3methyimidazolium bis (trifluoromethyl) imide (EMIm (TFSI) ) in a double cross-linked network. An ion cross-linking network and a covalent cross-linking network are interlaced in the double cross-linked network, which considerably increased the flexibility and stability of the ionogel electrolyte. As a result, DC-Ionogel outperformed in terms of flame retardancy and thermal dimensional stability and outperformed in terms of electrochemical performance, with higher room ionic conductivity (1.79 × 10 −3 S cm −1 ) and a broader electrochemical window (5 V). Due to its excellent performance, it is more likely to be used in flexible energy-storage devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yueshan Li,Da Li,Weihao Yuan,Yibo Shen,Zhen Hu
Conventional epoxy resins have high cross-linking density and rigid molecular structures, which make them difficult to develop into flexible elastomers. Here, inspired by the cuticle of the marine mussel byssi, we incorporate reversible Fe3+–carboxyl cross-links into a cross-linked epoxy network through a transformation between chemical cross-links and physical cross-links to realize the construction of a dynamic cross-linked network in traditional epoxy resins. Dynamic cross-linking networks and long flexible chain segments endow the epoxy system with excellent stretchable properties. Carbon nanotubes coated with ferric oxide (Fe3O4) nanoparticles were synthesized and added to the epoxy system, reinforcing the epoxy system. The synergistic combination of the modified molecular structure and nanohybrid endows the epoxy system with 550% elongation at break, a tensile strength of 1.4 MPa, and the ability to respond quickly to an applied magnetic field. An ultrasensitive strain sensor was constructed from synthetic epoxy hybrid materials; the GF (strain coefficient) of the strain sensor was up to 344.32. This research will be beneficial in expanding the application range of traditional epoxy polymer materials in the emerging sensor field.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 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）