ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yang He,Feng Zhou,Yingxi Zhang,Tuan Lv,Paul K. Chu,Kaifu Huo
Silicon (Si) is a promising anode material for next-generation lithium-ion batteries (LIBs), but the huge volume change of Si particles causes anode fracture and delamination from the current collector, thereby stifling practical implementation. Herein, a high-toughness and hierarchical stress-dissipating binder for Si anodes is prepared by the covalent and hydrogen bonding of poly(acrylic acid) (PAA) and a cross-linked polyurethane (CPU). The physicochemical dual-cross-linked CPU-PAA binder with high toughness, large tensile strength, and hierarchical stress dissipation improves the structural integrity of Si anodes and minimizes thickness swelling. Finite element analysis confirms that the CPU-PAA binder reduces and uniformizes the stress distribution within the Si anodes during cycling. As a result, the Si/CPU-PAA anode shows a high capacity retention of 82.3% after 150 cycles at a high current density of 5 A g–1. Moreover, the Si/CPU-PAA//LiNi0.5Co0.2Mn0.3O2 full cell delivers stable cycling performance, highlighting the great potential of the CPU-PAA binder in high-energy-density LIBs. This work provides insights into the design of high-strength, large-toughness, and efficient stress-dissipating binders for high-performance Si anodes.
研究领域:
材料科学
·
电池技术
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR RESEARCH
·
2012
·Vol. 20
·期 6
·642-649
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IF 1.153
Liu Xin,Xu Kai,Liu Huan,Cai Hualun,Fu Zien,Guo Ying,Chen Mingcai
Four series of cross-linked polyurethanes with polyester polyols as soft segments were prepared by selfcuring of isocyanate-terminated polyurethanes. Polyester polyols herein were derived from different dimer fatty acids weight content, such as dicarboxylic acid leading to various hydrophobicity and steric hindrance. The structure of cross-linked polyurethane was characterized by Fourier transform infrared spectroscopy (FTIR). The surface properties and mechanical and thermal properties of cross-linked polyurethane were investigated using contact meter, tensile tester, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that with increasing dimer fatty acid weight content from 0% to 100%, the cross-linked polyurethanes exhibited increased hydrophobicity (water contact angle increased from 91o to 96o), improved water resistance (water uptake decreased from 1.41% to 0.34%), toluene resistance (weight loss decreased from 33.2% to 22.7%), and hydrolytic resistance (weight loss decreased from 0.60% to 0.27%), enhanced mechanical properties (tensile strength increased from 1.3 to 4.8 MPa), and thermal stability (decomposition temperature of 50% weight loss increased from 425 to 462 °C).
研究领域:
高分子材料科学
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生物医学工程
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表面化学
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药物递送系统
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2018
·
IF 0
De-Fu Li,Xi Zhao,Yun-Wan Jia,Xiu-Li Wang,Yu-Zhong Wang
Simultaneously endowing poly(lactic acid) (PLA) with flame retardancy and toughness still is a challenge. In this study, a novel biobased phosphorus-nitrogen containing flame retardant (PA-HDA), synthesized from phytic acid and 1,6-hexanediamine, is employed into a toughened PLA (TPLA) composite, which is achieved by in situ formed crosslinked polyurethane (CPU). The comprehensive properties of PLA composites such as thermal stability, thermal transition behaviors, mechanical properties and flame retardancy have been well investigated. Only with 5 wt% PA-HDA loading, TPLA can pass UL-94 V-0 rating while its limiting oxygen index (LOI) value is as high as 26%. Besides, the flame retardant TPLA still keeps good tensile and impact toughness, i.e. its elongation at break and notched impact strength are enhanced to 207.3% and 5.0 kJ/m 2 , which are 26.6 and 2.8 times of those of neat PLA, respectively. Surprisingly, it is found that PA-HDA can rise the crystallinity of PLA. But the glass transition temperatures and the initial decomposition temperatures of flame-retardant TPLA are decreased compared to those of pure PLA. By adjusting the PA-HDA loading, we can achieve the balance between the flame retardancy and good mechanical properties of PLA.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Weiwei Fan,Qiang Gao,Zhonghui Wang,Jun Xiang,Huan Wei,Haojun Fan
In this work, a type of modified aluminum oxide-titanium dioxide composite filler (MAT) was employed as a high refractive index and wide electron band gap filler and incorporated into reversible cross-linked polyurethane (RCPU) with disulfide bonds to prepare passive radiative cooling coating. After modification by a 3-isocyanatopropyltrimethoxysilane coupling agent, the urethane and siloxane chains were found to covalently bond between aluminum oxide and titanium dioxide, which imparts the MAT filler a good dispersion level in the RCPU matrix. The as-prepared RCPU-MAT10 coating with 10 wt % of the MAT filler possessed desirable solar reflectance and thermal emittance in atmospheric transparency windows of 0.874 and 0.977, respectively, resulting in a subambient daytime cooling of 8.7 °C (solar light irradiation is 814 W/m2) and a nighttime cooling of 4.2 °C under outdoor environments. Taking advantage of the dynamic exchange feature of disulfide bonds, RCPU-MAT10 exhibited good recyclability behavior under heating (100 °C) for 10 min. More encouragingly, the recycling efficiency in passive radiative cooling performance for RCPU-MAT10 still remained above 95% after three cycles.
研究领域:
材料科学
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环境科学
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高分子化学
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Haocheng Wang,Ning Tang,Ruofei Zhang
This study presents a dynamically crosslinked synthesis method for polyurethane (PU)-modified bitumen by directly incorporating polyols (PEG-2000), methylene diphenyl diisocyanate (MDI), and additives into asphalt to create an adaptable polymer network. By carefully adjusting the NCO/OH molar ratio between 0.67 and 2.00, targeted control of material properties was achieved. When using excess MDI (NCO/OH > 1.00), the modified asphalt showed improved high-temperature performance with a 12.3 °C rise in softening point, 45 % lower penetration value, and increased viscosity (1.63 Pa·s at 135 °C), consistent with enhanced crosslinking of rigid polymer segments. Conversely, formulations favoring PEG content (NCO/OH < 1.00) demonstrated better flexibility, improving ductility by 4.0 cm through plasticizing effects. The covalent bonds in PU-modified system provided exceptional storage stability, maintaining a 0.6 °C softening point difference compared to 4.5 °C variations observed in conventional SBS-modified asphalt. Comprehensive characterization using FTIR spectroscopy, atomic force microscopy, and thermal analysis confirmed successful PU formation, and identified crosslinking-dependent phase separation. These findings establish a molecular design strategy for engineering asphalt binders with customizable performance profiles to meet diverse pavement requirements.
研究领域:
材料科学
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高分子科学
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土木工程
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化学工程
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道路建筑材料
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 18
·11021-11029
·
IF 3.108
Chang Liu,Yayuan Guan,Yuling Su,Lili Zhao,Fancui Meng,Yongchao Yao,Jianbin Luo
The extracellular stability versus intracellular drug release and the long blood stream circulation versus enhanced cell uptake are two dilemmas for micellar drug delivery systems. To resolve the above two problems, a novel core cross-linked polyurethane micelles with redox sensitive and pH-responsive surface charge switchable properties were prepared and investigated as anti-cancer drug carriers. Firstly, amphiphilic multi-blocked polyurethane with pendant carboxyl groups and disulfides in the hard segment (PU-SS-COOH) was synthesized. Afterwards, 1,6-diaminohexane was connected onto some of the pendant carboxyl groups via dicyclohexylcarbodiimide (DCC) condensation, which resulted in polyurethane with pendant amine and carboxyl groups (PU-SS-COOH-NH2). Then the PU-SS-COOH-NH2 was assembled into micelles and the hexamethylene-1,6-diisocyanate (HDI) was added into the micelle solution. The hydrophobic diisocyanate penetrated into the hydrophobic core of PU micelles and reacted with amine groups, which resulted in core crosslinked PU micelles (PU-CCL). PTX and doxorubicin hydrochloride (DOX) were chosen as model hydrophobic drugs to evaluate the loading and redox-triggered release of the PU micelles. The drug release from the cross-linked polyurethane micelles (PU-CCL) demonstrated that the PU-CCL has superior particle stability compared with the uncross-linked polyurethane micelles in a phosphate buffer saline (PBS) solution without reducing agents, whereas the drug release rate is markedly accelerated with the addition of a reducing agent, glutathione (GSH). Notably, PU micelles with both amine and carboxyl groups, i.e. PU-SS-COOH-NH2 and PU-CCL micelles, showed pH-responsive charge switchable properties. The in vitro cytotoxicity and cell uptake of the PTX (or DOX used to illustrate the cell uptake) loaded micelles was also assessed in HepG2 cells. It was found that the redox-sensitive polyurethane micelles can rapidly enter tumor cells. In vitro cytotoxicity studies demonstrated that the DOX-loaded PU-CCL display lower cytotoxicity in vitro compared to either free DOX or DOX-loaded uncrosslinked PU micelles. The cross-linked reduction responsive biodegradable micelles, having superior extracellular stability and providing rapid intracellular drug release, may hold great potential as a bio-triggered drug delivery system for cancer therapy.
研究领域:
药学
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材料科学
·
纳米技术
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癌症研究
·
药物递送系统
✓ 已验证
产品关联
DOI
高影响因子
Biomed Research International
·
2015
·
IF 1.579
Zhisen Shen,Dakai Lu,Qun Li,Zongyong Zhang,Yabin Zhu
Biodegradable crosslinked polyurethane (cPU) was synthesized using polyethylene glycol (PEG), L-lactide (L-LA), and hexamethylene diisocyanate (HDI), with iron acetylacetonate (Fe(acac)3) as the catalyst and PEG as the extender. Chemical components of the obtained polymers were characterized by FTIR spectroscopy, 1H NMR spectra, and Gel Permeation Chromatography (GPC). The thermodynamic properties, mechanical behaviors, surface hydrophilicity, degradability, and cytotoxicity were tested via differential scanning calorimetry (DSC), tensile tests, contact angle measurements, and cell culture. The results show that the synthesized cPU possessed good flexibility with quite low glass transition temperature (, −22°C) and good wettability. Water uptake measured as high as 229.7 ± 18.7%. These properties make cPU a good candidate material for engineering soft tissues such as the hypopharynx. In vitro and in vivo tests showed that cPU has the ability to support the growth of human hypopharyngeal fibroblasts and angiogenesis was observed around cPU after it was implanted subcutaneously in SD rats.
研究领域:
材料科学
·
组织工程
·
生物材料
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）