POLYMER TESTING
·
2022
·
IF 4.931
Ying Chen,Jie Li,Jiawei Lu,Meng Ding,Yi Chen
PVA hydrogels with high strength and toughness are fabricated by dual physical and chemical cross-linking. The best comprehensive mechanical properties can be achieved by reaction at room temperature followed with freeze-thaw and annealing treatment. Besides, the mechanical properties of PVA hydrogel increased first and then decreased with the increase of molecular weight or mass fraction. By changing the reaction solvent, the mechanical properties of PVA hydrogel could also be effectively adjusted. Therefore, the influences of various factors on the mechanical properties of PVA hydrogel can be obtained.
研究领域:
生物材料
·
高分子科学
·
组织工程
·
生物医学工程
·
软物质物理
·
药物递送系统
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2016
·Vol. 217
·期 9
·1047-1056
·
IF 2.495
Liang Qiu,Chao-Ran Xu,Feng Zhong,Chun-Yan Hong,Cai-Yuan Pan
Pure cross-linked spherical micelles, nanowires, and vesicles are successfully fabricated from poly(2-hydroxypropyl methacrylate- b - p -(methacryloxyethoxy)benzaldehyde)s (PHPMA– b –PMAEBAs) through reversible addition-fragmentation chain transfer dispersion polymerization of MAEBA in methanol using PHPMA as a macro-CTA and subsequent cross-linking. The cross-linking reaction is conducted by stirring a mixture of 1,4-butanediamine and the resultant nano-objects in methanol at room temperature. For all polymerizations with feed molar ratios of MAEBA/PHPMA ranging from 75/1 to 240/1, the monomer MAEBA conversions are almost complete, and block copolymers with controlled molecular weight are obtained. The transmission electron microscopy, dynamic light scattering, and gel permeation chromatography results reveal that the following three factors significantly influence the morphology of the nano-objects: the feed molar ratio of MAEBA/PHPMA, the copolymer concentration, and the degree of polymerization of PHPMA. The cross-linked nano-objects are very stable in good solvents, the spheres and nanowires slightly decrease in size after cross-linking, whereas the vesicles slightly increase in size. The cross-linked nano-objects are stable in neutral solutions, but they dissociate in weekly acidic solutions. The loading of 1-pyrenemethylamine (PMA) into the vesicles and the unloading of PMA from the vesicles are studied.
研究领域:
高分子化学
·
纳米材料
·
药物递送
·
生物医学工程
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 49
·42854-42862
·
IF 3.289
He Liu,Aiting Wang,Xu Xu,Mengmeng Wang,Shibin Shang,Shiwei Liu,Jie Song
Cellulose aerogels based on crosslinking of cellulose with 1,4-butanediol diglycidyl ether (BDE) were homogeneously synthesized in NaOH/urea aqueous solution followed by freeze-drying. In the NaOH/urea aqueous solution, cellulose existed in a sodium alkoxide form that could react with the epoxide groups of BDE. The rheological behavior of the cellulose/NaOH/urea aqueous solution showed that the crosslinking reaction occurred immediately once the BDE was added to the cellulose/NaOH/urea aqueous solution at room temperature. The X-ray diffraction (XRD) characterization identified a transition from the crystalline structure of cellulose to an amorphous state of cellulose aerogels with increasing amount of BDE. Elemental analysis revealed the variation in carbon and oxygen elemental percentages in cellulose aerogels caused by the reaction between cellulose and BDE. The porous network of aerogels was observed by scanning electron microscopy (SEM) and the pore size of the aerogels increased as a function of BDE. The water adsorbent ability of aerogels was up to 41 g g−1—even after 30 squeezing–adsorption cycles, the water adsorbent ability was still 37 g g−1.
研究领域:
高分子材料科学
·
纳米材料学
·
绿色化学
·
生物基功能材料
·
环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Xinming Du,Zhe Wang,Wenchang Liu,Jingmei Xu,Zhaoyu Chen,Chunmei Wang
A series of phenolphthalein-based poly (arylene ether ketone) (PEK) copolymer are synthesized to prepare anion exchange membranes (AEMs). The ion group 1-vinyl imidazole is introduced on the unit of phenolphthalein-based as a hydrophilic segment and cross-linking agent. The structure of resulting membranes was investigated by 1 H NMR and FT-IR. The well-defined microphase-separated structures were verified by TEM and SAXS profiles. The cross-linked membrane of ImPEK-0.4 exhibits high hydroxide conductivity (0.0836 S/cm, at 80 °C), excellent mechanical performance (69.6 MPa) and the maximum swelling ratio is only 7.95% at 80 °C. Furthermore, the excellent alkaline stability is demonstrated by immersing the prepared membrane in 1 M NaOH at 40 °C for 400 h. The ionic conductivity is still high to 0.0381 S/cm for ImPEK-0.4. These results indicate that combining phase separation architecture and crosslinking may possess potential applications for alkaline fuel cells (AFCs).
研究领域:
高分子材料科学
·
电化学能源材料
·
燃料电池技术
·
膜分离工程
·
聚合物化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Heli Yu,Mingzhu Bi,Cuijuan Zhang,Tianjie Zhang,Xiaoning Zhang,Hongtao Liu,Jianli Mi,Xiangqian Shen,Shanshan Yao
Construction of high sulfur loading electrode is one of the effective ways to achieve high specific energy density lithium/sulfur batteries. Therefore, the optimization of polymeric binders has been considered as effective strategy to improve the volume changes of sulfur electrodes during charge/discharge processes. In this work, an effective route for the preparation of three dimensional polymeric binder (PAA-PANI) via multiple hydrogen bonds was developed and fabricated through in situ polymerization between polyacrylic acid (PAA) and polyaniline (PANI), which possess bifunctional effects on high sulfur loading cathodes in lithium/sulfur batteries. The carboxyl polar groups of PAA could effectively adsorb polysulfides and the conductive PANI enhance the electronic conductivity of the sulfur electrode. The three dimensional polymeric binder of PAA-PANI has enhanced the active material adhesion, mechanical properties and electronic conductivity, which decreased overpotential polarization, improved the lithium ions diffusion coefficient, and reduced the self-discharge. More importantly, the PAA-PANI functional binder could alleviate the expansion of high sulfur loading electrode. Taking advantages of PAA-PANI binder, the carbon nanotubes modified sulfur electrode (CNTs@S; sulfur content: 84.3 wt%) with PAA-PANI binder exhibits an initial discharge capacity of 906 mAh g –1 at 2.56 mA cm –2 (0.3 C) under a sulfur loading of 5.1 mg cm –2 . Even at higher current density of 8.54 mA cm –2 (1 C), the PAA-PANI binder electrode delivers a high capacity of 846 mAh g –1 . Moreover, with an extremely high areal sulfur loading of 17 mg cm –2 , the cathode shows an areal specific capacity of 16.7 mAh cm –2 .
研究领域:
电化学
·
能源材料
·
高能电池
·
功能高分子
·
界面化学
·
储能技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 32
·46579
·
IF 1.901
Xie Li,Wei Li,Zhiqing Liu,Xiaolin Wang,Heling Guo,Rongjie Wang,Xuhong Guo,Cuihua Li,Xin Jia
Polyurethane (PU) has been widely used as a glue in various areas. However, adhesion in the presence of water is greatly impeded and results in most synthetic adhesive failure. In this study, we designed and synthesized a novel PU construction; underwater PU adhesives were created by the incorporation of synthetic glycerol monomethacrylate (GMA). Furthermore, the urethane structure helped the adhesive eliminate the interfacial water barrier through interactions that were stronger than hydrogen bonding, and GMA as a crosslinking agent was used to generate post-covalent-crosslinking networks through radical polymerization. This enhanced the cohesion so the diffusion of water molecules could be overcome. Fourier transform infrared spectroscopy, thermogravimetric analysis, underwater adhesion measurements, and tensile tests were used to characterize the chemical and mechanical properties of the as-obtained adhesive. This led to an adhesive with a better mechanical strength and interfacial adhesion in water, and the results show that the mechanical properties (tensile strength, Young's modulus, and tensile elongation) of the GMA–PU adhesive were higher than those of the pure PU. As for the 4% GMA, the tensile strength was enhanced by 24.3% and the elongation was enhanced by 125.23% over those of the pure PU. This confirmed that the incorporation of GMA into the PU matrix indeed induced increasing cohesion, and the sample's adhesive strength was 21.19 ± 3.9 MPa; this indicated a superior adhesive strength over that of the pure PU. In addition, we can foresee that underwater adhesion will play an important role in prospective surgery and engineering areas. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46579.
研究领域:
高分子材料
·
生物医学工程
·
粘附科学
·
组织工程
·
医用胶粘剂
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Haofei Li,Hongbo Wang,Dongfei Zhang,Ziyang Xu,Wenguang Liu
Recently, we have constructed a high strength and thermoplastic supramolecular poly( N -acryloyl glycinamide) (PNAGA) hydrogel which can be developed as printable bioinks. However, the PNAGA hydrogel is low in stiffness and toughness, potentially limiting its application as load-bearing soft tissue scaffolds. In this work, we fabricate a supramolecular polymer double-network hydrogel based on hydrogen bonding crosslinked PNAGA and Fe 3+ -coordination crosslinked sodium carboxymethyl cellulose (CMC). The combined hydrogen bonding and ionic crosslinks contribute to high-strength nonswellable PNAGA/CMC-Fe hydrogels (Tensile strength of 2.9 MPa and compressive strength of 7.3 MPa at 80% strain without fracture) and stiffness (Young's modulus of 1.2 MPa and compressive modulus of 1.5 MPa). Furthermore, these reversible double physical crosslinks enable the PNAGA/CMC-Fe hydrogels to dissipate energy efficiently with a high toughness (12.3 MJ m −3 ) and tear energy (3700 J m −2 ), meanwhile imparting self-recoverability, anti-fatigue ability and self-healability to the network. This cytocompatible supramolecular polymer double network hydrogel with excellent multifaceted mechanical performances are promising to exploited as load-bearing soft tissue engineering scaffolds .
研究领域:
生物材料学
·
组织工程
·
高分子科学
·
再生医学
·
生物力学
✓ 已验证
DOI
高影响因子
Energy & Environmental Materials
·
2022
·Vol. 6
·期 4
·e12568
·
IF 13.443
Kai Chen,Yuxue Sun,Xiaorong Zhang,Jun Liu,Haiming Xie
The self-healing solid polymer electrolytes (SHSPEs) can spontaneously eliminate mechanical damages or micro-cracks generated during the assembly or operation of lithium-ion batteries (LIBs), significantly improving cycling performance and extending service life of LIBs. Here, we report a novel cross-linked network SHSPE (PDDP) containing hydrogen bonds and dynamic disulfide bonds with excellent self-healing properties and non-flammability. The combination of hydrogen bonding between urea groups and the metathesis reaction of dynamic disulfide bonds endows PDDP with rapid self-healing capacity at 28 °C without external stimulation. Furthermore, the addition of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) improves the ionic conductivity (1.13 × 10 −4 S cm −1 at 28 °C) and non-flammability of PDDP. The assembled Li/PDDP/LiFePO 4 cell exhibits excellent cycling performance with a discharge capacity of 137 mA h g −1 after 300 cycles at 0.2 C. More importantly, the self-healed PDDP can recover almost the same ionic conductivity and cycling performance as the original PDDP.
研究领域:
材料科学
·
高分子化学
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Ping He,Yu Zhang,Zhenguo Wang,Peng Min,Zhiming Deng,Lulu Li,Lvxuan Ye,Zhong-Zhen Yu,Hao-Bin Zhang
Graphene has been widely studied for its excellent properties of outstanding conductivity, strength , and flexibility. However, interlayer defects formed during the macroscopic assembly of graphene nanosheets will severely degrade the performance of graphene films. Herein, a strategy combined with trace carboxyl graphene oxide (GO), mild reduction, and chemical crosslinking is employed to minimize the interlayer defects for enhancing both the conductivity and mechanical strength of graphene films. The trace carboxyl feature of GO allows nanosheets to assemble orderly into highly oriented GO films . Subsequently, the mild chemical reduction preserves the highly oriented and packed microstructure. Coupling with further crosslinking by introducing conjugated molecules with pyrene terminal groups (1-pyrene butyric acid-1,6-hexane diamine, PHD) to provide extra π-π bonds, both the mechanical strength and conductivity of graphene films are improved to 548.4 MPa and 1.7 × 10 5 S m −1 , respectively. In addition, the graphene film with only ∼2 μm in thickness possesses an excellent electromagnetic interference shielding effectiveness (EMI SE) of ∼40 dB and a specific shielding effectiveness of up to 74 278 dB cm 2 g −1 in a wide frequency range of 8.2–40.0 GHz. Thus, this study provides an energy-saving fabrication route for mechanically strong, effective thermal management and EMI shielding films.
研究领域:
材料科学
·
纳米科技
·
高分子化学
·
功能材料
·
电磁屏蔽
·
热管理
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 78
·41398-41410
·
IF 3.708
Xiuhua Li,Jinxiong Tao,Guanghui Nie,Liuchan Wang,Liuhong Li,Shijun Liao
A series of cross-linked multiblock copoly(arylene ether sulfone) ionomer/nano-ZrO2 (CLQCPAES/nano-ZrO2) composite anion exchange membranes were prepared via block copolymerization, bromomethylation, ultrasonication blending, self-crosslinking, quaternization and alkalization. The structure, and the surface and cross section morphology of the CLQCPAES/nano-ZrO2 composite membranes were characterized by solubility tests, FT-IR, XRD and SEM analyses. The combination of the determined results revealed that the CLQCPAES/nano-ZrO2 composite membranes are a complex cross-linking networks of hydrophobic domains/hydrophilic domains/nano-ZrO2 with a clear zonal distribution of uniform nano-sized particles in the hydrophilic domains, when the nano-filler loading was below 7.5%. Basic performances of the CLQCPAES/nano-ZrO2 composite membranes were assessed to investigate their application in fuel cells in terms of the water uptake, swelling ratio, ion exchange capacity (IEC), hydroxide conductivity, thermal and mechanical properties, and alkaline stability. The modification of anion exchange membranes with multiblock ionomer structures, the use of a cross-linking technique and the introduction of nano-ZrO2 particles greatly enhanced the water uptake, hydroxide conductivity, mechanical properties and alkaline stability of the composite membranes. In particular, the CLQCPAES/7.5%ZrO2 membrane with an IEC value of 1.23 mmol g−1 exhibited the best comprehensive properties and constitutes a good potential candidate for an anion exchange membrane to be used in AEMFCs.
研究领域:
高分子材料科学
·
电化学
·
能源材料
·
膜科学与技术
·
燃料电池
·
纳米复合材料
·
功能高分子
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Chao Yang,Jun Yang,Ge Song,Limin Zang,Qifan Liu,Jianhui Qiu,Xue Yang,Chun Wang
Oil/water separation has recently attracted a great deal of attention for research due to the frequent occurrence of an oil spill as well as the increase of industrial and household oily wastewater. Therefore, the purpose of this study is to demonstrate underwater superoleophobic crosslinked phosphorylated poly(vinyl alcohol) hydrogel coated stainless steel mesh (CL-PPVA@SSM), which was fabricated using a simple dip-coating method and aldol reaction on the mesh substrate. The as-prepared CL-PPVA@SSM is capable of separating oil from a variety of different oil/water mixtures with high separation efficiency up to 99.2%, excellent recyclability and fast water permeate flux of 467.7 L m –2 h –1 , which makes it suitable for the separation of oil-water mixtures from oil-water emulsions. Also, in the oil-water separation process, the CL-PPVA@SSM is capable to remove organic dye from the water. The CL-PPVA@SSM exhibits stability under various harsh conditions such as mechanical abrasion. Importantly, the CL-PPVA@SSM shows a massive potential to separate kitchen waste oil/water mixtures due to the underwater superoleophobic property as required for the recycling of kitchen waste oil. Therefore, this method has been met with a promising application prospect of practical application.
研究领域:
材料科学
·
环境工程
·
高分子化学
·
表面工程
·
化学工程
·
纳米技术
·
水处理技术
✓ 已验证
DOI
高影响因子
Advanced Science
·
2020
·Vol. 7
·期 21
·1902740
·
IF 15.84
Mohammad Ali Darabi,Ali Khosrozadeh,Ying Wang,Nureddin Ashammakhi,Halima Alem,Ahmet Erdem,Qiang Chang,Kaige Xu,Yuqing Liu,Gaoxing Luo,Ali Khademhosseini,Malcolm Xing
Strong, stretchable, and durable biomaterials with shape memory properties can be useful in different biomedical devices, tissue engineering, and soft robotics. However, it is challenging to combine these features. Semi-crystalline polyvinyl alcohol (PVA) has been used to make hydrogels by conventional methods such as freeze–thaw and chemical crosslinking, but it is formidable to produce strong materials with adjustable properties. Herein, a method to induce crystallinity and produce physically crosslinked PVA hydrogels via applying high-concentration sodium hydroxide into dense PVA polymer is introduced. Such a strategy enables the production of physically crosslinked PVA biomaterial with high mechanical properties, low water content, resistance to injury, and shape memory properties. It is also found that the developed PVA hydrogel can recover 90% of plastic deformation due to extension upon supplying water, providing a strong contraction force sufficiently to lift objects 1100 times more than their weight. Cytocompatibility, antifouling property, hemocompatibility, and biocompatibility are also demonstrated in vitro and in vivo. The fabrication methods of PVA-based catheters, injectable electronics, and microfluidic devices are demonstrated. This gelation approach enables both layer-by-layer and 3D printing fabrications.
研究领域:
生物材料学
·
组织工程
·
软体机器人
·
再生医学
·
生物医学工程
·
高分子科学
·
转化医学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）