TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Bingyu Tian,Fan Xu,Kun Cui,Mengyao Liu,Yingying Yao,Ping Wen,Rui Dong,Mingjin Fan
Polyethylene glycol (PEG) system behave the characteristics of non-toxic, non-irritating and good compatibility with various substances, so the improvement and stability of lubrication property and comprehensive performance is vital for PEG system under harsh working conditions. Here, highly reactive ionic liquids (ILs) are designed and introduced with a specifically designed molecular structure, the ultra-short running-in period and robust lubricity can be obtained by dynamic disulfide and hydrogen bonds from the constructed IL-PEG200 lubrication system. Combined with analytical techniques (XPS, FIB-TEM, Nanoindentation, Raman, TOF-SIMS), their interaction was explored to further clarify the interfacial self-assembly behavior. The superior bearing capacity is mainly ascribed to the synergistic effect of carbon-like film, dynamic disulfide bond, hydrogen bonding and interfacial tribochemical reaction.
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DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Mengru Ding,Lingling Ni,Ying Zheng,Bao Wang,Chengtao Yu,Guorong Shan,Yongzhong Bao,Junfeng Liu,Pengju Pan
Long-spaced aliphatic polyesters are typical sustainable polyethylene (PE)-like polymers. However, the presence of a low amount of ester groups can exert a profound effect on the crystalline structure of such PE-like polymers. Herein, we synthesized a series of long-spaced aliphatic polyesters bearing two proximate ester groups from ethylene glycol (EG) and n-methylene diacids (n = 9–18) and investigated their polymorphic crystallization and phase transitions. We find that the EG-based polyesters exhibit unique crystal polymorphism and phase transition behaviors. They can form a metastable hexagonal phase (form II) with nontilted, extended chain conformations at low temperatures or during rapid cooling but adopt the thermally stable orthorhombic phase (form I) with tilted chain packing at high temperatures or under slow cooling. Form I demonstrates a more densely packed chain structure and displays distinct mechanical properties compared to form II. The metastable hexagonal phase can transform into an orthorhombic phase during heating through a melt-recrystallization mechanism. This study advances the current understanding of the multiphase crystallization of PE-like long-spaced polyesters.
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 3
·1262-1271
·
IF 2.578
Qingzhen Zhu,Baogang Zhang,Yuandou Wang,Xinghua Liu,Weiwei Li,Feng Su,Suming Li
Poly( D , L -lactide-co-glycolide)-poly(ethylene glycol) (PLGA-PEG) diblock copolymers with different compositions were synthesized by ring-opening polymerization of D , L -lactide and glycolide, using monomethoxy PEG as macro-initiator. The resulting copolymers were characterized by nuclear magnetic resonance, gel permeation chromatography, and critical micelle concentration analyses. Self-assembly of the copolymers yielded aggregates of different architectures, including spherical micelles and a mixture of spherical and worm-like micelles with Y-junctions. The self-assembled architecture depends on both the hydrophilic/hydrophobic balance and the molar mass of copolymers. Valsartan, a widely used drug in the treatment of hypertension, was loaded in micelles using a co-solvent evaporation method. High drug-loading content was obtained for worm-like micelles. in vitro drug release was performed at 37°C in pH 7.4 phosphate-buffered saline. An initial burst release is detected in all cases, followed by slower release up to 9 days. The overall release rate is strongly dependent on the degradation of micelles. Copolymers with short PLGA blocks exhibit faster drug release due to faster degradation of micelles, and worm-like micelles present slower drug release as compared to spherical ones. Therefore, PLGA-PEG copolymer micelles with high drug-loading capacity, different architectures, and variable drug release rates could be most attractive for sustained delivery of valsartan.
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Youwei Yang,Jingyu Zhang,Yueqi Gao,Busha Assaba Fayisa,Antai Li,Shouying Huang,Jing Lv,Yue Wang,Xinbin Ma
The efficient hydrogenation of CO 2 -derived ethylene carbonate (EC) to yield methanol (MeOH) and ethylene glycol (EG) is a key process for indirect conversion of CO 2 to MeOH. However, a high H 2 /EC molar ratio during the hydrogenation process (usually as 180–300) is generally required to achieve good catalytic performance, resulting in high cost and energy consumption for H 2 circulation in the promising industrial application. Here, we prepared a series of Ni-modified Cu/SiO 2 catalysts and explored the effects of synthesis methods and Ni contents on catalytic performance under different H 2 /EC molar ratios. The Cu/SiO 2 catalyst with 0.2% (mass) Ni loading prepared by co-ammonia evaporation method exhibited above 99% conversion of EC, 91% and 98% selectivity to MeOH and EG respectively at H 2 /EC ratio of 60. And no significant deactivation was observed within 140 h at a lower H 2 /EC of 40. It is demonstrated that a few of Ni addition could not only promote Cu dispersion and increase surface Cu + species due to the strong interaction between Cu and Ni species, but also form uniformly-dispersed CuNi alloy species and thus enhance the adsorption and dissociation of H 2 . But the excess Ni species would aggregate and segregate to cover partial surface of Cu nanoparticles , leading to a significantly drop of catalytic performance in EC hydrogenation. These insights may provide guidance for further design of catalysts for the ester hydrogenation reactions.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shufeng Shen,Xiaoqin Shi,Chenxu Li,Hui Guo,Qinghai Long,Shuo Wang,Xin Yin
Nonaqueous amine-based absorbents, particularly liquid biphasic solvents, have recently received increasing attention due to the potential for reducing the energy penalty of CO 2 capture. In this work, a series of glycol ethers were used as cosolvents dissolving primary and secondary alkanolamines. Phase transition behavior, CO 2 absorption and desorption characteristics have been investigated for the nonaqueous 5.0 M amine blends. Different phase behaviors upon CO 2 absorption were discussed and well explained by the polarity change and the solubility parameter interaction distance (SPID) of components and the reaction products. Regeneration energy requirement was also experimentally estimated and compared with the reference aqueous monoethanolamine (MEA). The species in the CO 2 -loaded solution play a central role in regulating phase separation behaviour and CO 2 capture performance. A defined SPID value was recommended to predict the monophasic and the biphasic states. Advanced systems of 2-(methylamino)ethanol (MAE) with diethylene glycol dimethyl ether (DEGDME) as liquid biphasic solvent and MAE with ethylene glycol monomethyl ether (EGME) as single phase solvent were proposed for energy-efficient CO 2 capture. Among the systems investigated, MAE/EGME has the lowest regeneration energy consumption estimated at about 1.75 MJ kg −1 CO 2 captured. The ionic carbonated products of alkanolamines can trigger the phase change behaviour due to their limited solubility in the more hydrophobic and weakly polar DEGDME, resulting in two opposite phases enriched in different components. Benefiting from the high enrichment (>95 %) of CO 2 captured in the lower phase and the large cyclic capacity, MAE/DEGDME biphasic solvent can reduce the energy consumption by 50–59 % compared with aqueous MEA.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ling Zhou,Li-Sheng Tang,Xue-Feng Tao,Jie Yang,Ming-Bo Yang,Wei Yang
How to realize large-scale manufacture of phase change materials (PCMs) with high latent heat storage and excellent shape stability is still a great challenge. Recently, encapsulating PCMs with three-dimensional porous structure is of great interest due to its excellent leak-proof ability and large latent heat storage capacity. However, the conventional fabrication techniques of 3D supporting skeletons for loading PCMs commonly involves hydrothermal process, freeze-drying and vacuum impregnation, which is difficult to operate and costly for large-scale manufacture. Herein, a facile and novel strategy for the potential large-scale manufacture of 3D porous structure supported PCMs is presented. This strategy involves two steps: rapid preparation of a novel CNC hydrogel based on UV-induced thiol-ene click chemistry and direct impregnation of PEG PCMs into the CNC hydrogel using solvent-exchange strategy for the first time. The structure and properties of CNC hydrogels and PEG/CNC hybrid PCMs are characterized. High latent heat, improved thermal conductivity, excellent thermal and shape stability are observed in the PEG/CNC hybrid PCMs. An obvious decrease of the crystalline phase change temperature is also observed due to the strong hydrogen bonding between the well reserved CNC nanofiber network and PEG molecule chains. This solvent-exchange strategy shows great potential in the large-scale manufacture of high-performance and shape-stable PCMs.
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DOI
高影响因子
ACS SYMPOSIUM SERIES
·
2012
·
IF 0
Pingwei Liu,Weiqiang Lu,Wen-Jun Wang,Bo-Geng Li,Zhibin Ye,Shiping Zhu
Amphiphilic diblock copolymers consisting of linear or hyperbranched polyethylene (PE) and poly[oligo (ethylene glycol) methyl ether methacrylate] (POEGMA) were synthesized via atom transfer radical polymerization (ATRP) initiated by PE macroinitiators (MIs). The MIs contained an end-capping 2-bromoisobutyryl group per chain. Their linear and hyperbranched structures were first synthesized through a ‘‘living’’ polymerization of ethylene under pressure of 27.6 and 1 atm, respectively, using Pd–diimine catalyst, [(ArN=C(Me)–(Me)C=NAr)Pd(CH2)3C(O)O(CH2)2OC(O)C(CH3)2Br]+ SbF6− (Ar = 2,6-(iPr)2C6H3) (1). In the ATRP of OEGMA, the effect of solvent, ligand, and MI concentration on the block copolymer formation were studied. The macroinitiator and block copolymer samples were characterized by GPC, 1H NMR, and DSC measurements. All samples possessed well-defined topologies/structures with narrow molecular weight distributions and controlled lengths of PE and POEGMA blocks. The block structures were verified by an intrinsic viscosity study. Micelle formation and its temperature sensitivity were also analyzed by dynamic light scattering.
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DOI
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 10
·2286-2291
·
IF 2.557
Najing Fu,Xiao Liu,Liteng Li,Baokun Tang,Kyung Ho Row
A molecularly imprinted polymer based on a ternary deep eutectic solvent comprised of choline chloride/caffeic acid/ethylene glycol was prepared. The caffeic acid in the ternary deep eutectic solvent was used as both a monomer and template. The molecularly imprinted polymer based on the ternary deep eutectic solvent was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, field-emission scanning electron microscopy, Brunauer–Emmett–Teller surface area analysis, atomic force microscopy, and elemental analysis. A series of molecularly imprinted polymers based on choline chloride/caffeic acid/ethylene glycol with different molar ratios was prepared and applied to the molecular recognition of polyphenols. A comparison of the recognition ability of molecularly imprinted polymers to polyphenols revealed that the choline chloride/caffeic acid/ethylene glycol (1:0.4:1, molar ratio) molecularly imprinted polymer had the best molecular recognition effect with 132 μg/g of protocatechuic acid, 104 μg/g of catechins, 80 μg/g of epicatechin, and 123 μg/g of caffeic acid in 6 h, as well as good molecular recognition ability for polyphenols from a Radix Asteris sample. These results show that the ternary deep eutectic solvent based molecularly imprinted polymer is a potential medium that can be applied to drug purification, drug delivery, and drug analysis.
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2017
·
IF 2.552
Qihang Feng,Jiping Yang,Yalin Yu,Fangyu Tian,Boming Zhang,Mengjie Feng,Shubin Wang
As one of significant parts of structural power composites, structural electrolytes have desirable mechanical properties like structural resins while integrating enough ionic conductivity to work as electrolytes. Here, a series of polyethylene glycol (PEG)-epoxy-based electrolytes filled with nano-silica were prepared. The ionic conductivity and mechanical performance were studied as functions of PEG content, lithium salt concentration, nano-silica content and different curing agents. It was found that, PEG-600 and PEG-2000 content in the epoxy electrolyte system had a significant effect on their ionic conductivity. Furthermore, increasing the nano-silica content in the system induced increased ionic conductivity, decreased glass transition temperature and mechanical properties, and more interconnected irregular network in the cured systems. The introduction of rigid m-xylylenediamine resulted in enhanced mechanical properties and reasonably decreased ionic conductivity. As a result, these two-phase epoxy structural electrolytes have great potential to be used in the multifunctional energy storage devices.
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·3391-3409
·
IF 2.8
Jiang Shan,Wang Rui,Jin Changzi,Li Fei,Jiang Heng
The solid–liquid phase transfer catalyzed (S-L PTC) properties of polyethylene glycol (PEG) were investigated in the preparation of dialkyl disulfide (R 2 S 2 ) by oxidative coupling of alkyl mercaptan and sulfur with K 2 CO 3 as catalyst under atmospheric pressure and solvent-free conditions. The results have showed that the S-L PTC properties of PEG are not significantly different from those of crown ether. The S-L PTC properties of PEG are reduced due to methylation of the terminal hydroxyl groups, indicating that the terminal hydroxyl group in PEG plays an important role in stabilizing the [PEG-K 2 + CO 3 2− ] complex. The results of infrared spectral analysis confirm that CO 3 2− in K 2 CO 3 has a strong interaction with the terminal hydroxyl group in PEG. At the fixed molar ratio of –CH 2 CH 2 O-/K 2 CO 3 , the increase of PEG chain length has a positive correlation with the S-L PTC performance. The reaction rate and yield of R 2 S 2 can be improved by increasing the amount of K 2 CO 3 and the molar ratio of -CH 2 CH 2 O-/K 2 CO 3 appropriately. The PEG400/K 2 CO 3 system exhibits very high catalytic activity for the oxidative coupling reaction of alkyl mercaptan with sulfur as oxidant. The yield of the reaction product ( n -C 8 H 17 ) 2 S 2 can still reach more than 97% by using 0.1 mol% K 2 CO 3 and 0.006 mol% PEG400 (based on sulfur). Graphical Abstract
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·Vol. 142
·期 14
·e56682
·
IF 2.8
Huili Liu,Luyao Su,Ruihan Li,Liting Wang,Dongyu Bai
In this article, poly(ethylene glycol)-poly( d -lactide) (PEG-PDLA) block copolymers with different PEG chain lengths were synthesized and melt-mixed with poly( l -lactide) (PLLA) and rubber nanoparticles. The role of PEG-PDLA block copolymers in tailoring the microstructures and performances of PLLA/rubber blend were investigated in detail. It was found that high contents of stereocomplex (SC) crystals were generated in PLLA/rubber/PEG-PDLA copolymer blends, which induced rubber nanoparticles to agglomerate and form network-like structures. The size of rubber aggregates and continuity of rubber network-like structures first increased and then declined significantly as the PEG chain length increased. Resultingly, the impact toughness of PLLA/rubber/PEG-PDLA copolymer blends first remarkably increased to 74.1 kJ/m 2 and then decreased to 30.6 kJ/m 2 . Meanwhile, the elongation at break increased with increasing PEG chain length and little loss of tensile strength happened, revealing good stiffness-toughness balance performances of PLLA/rubber/PEG-PDLA copolymer blends. Moreover, the matrix crystallization rate of PLLA/rubber/PEG-PDLA copolymer blends could be greatly increased by increasing PEG chain length and the PLLA/rubber/PEG-PDLA copolymer blends exhibited much higher Vicat softening temperatures than PLLA/rubber blend, which confirmed the excellent heat resistance of PLLA/rubber/PEG-PDLA copolymer blends. These interesting findings suggested that PEG-PDLA block copolymers were highly conducive to prepare PLLA materials with outstanding comprehensive performances.
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DOI
高影响因子
Biofabrication
·
2025
·Vol. 17
·期 3
·035012
·
IF 8
Mengyuan Li,Jiaming Ge,Jingwen Yao,Yuanhao Zhang,Lin Ma,Zheng Li,Xiangli Han,Ming Liu,Fei Tian,Jing Zhao
Oral squamous cell carcinoma (OSCC) is the most common malignant tumor in the head and neck. Due to low bioavailability and passive targetability of anticancer drugs show great limitations in cancer therapy, the treatment of OSCC faces major challenges. Folic acid (FA) targeting can deliver anticancer drugs efficiently into the tumor environment, further enhance the anti-cancer efficacy. Herein, the nanoplatform based on UiO-66 that encapsulated with an effective FA targeting ligands and the pH-responsive polyethylene glycol (PEG) layer for the targeted delivery of berberine (Ber) is constructed for fighting against OSCC. The FA modification and controlled pH-responsiveness enable the targeted delivery of UiO-66/PEG-FA, which promotes the release of Ber and increases the cumulative intracellular Ber concentration, which both promote consumption of glutathione (GSH) and induced generation of reactive oxygen species (ROS), further stimulate the secretion of inflammatory factors (TNF-α and IL-1β). A comprehensive evaluation of in vitro and in vivo experiments show that UiO-66@Ber/PEG-FA promote autophagy and apoptosis of tumor cells by regulating the expression of Beclin-1, ATG13, BAX and Bcl-2, and effectively inhibit tumor growth. Overall, UiO-66@Ber/PEG-FA exhibit superior pH-responsiveness and targeted therapeutic efficiencies in vitro and vivo, it can serve as an approach for OSCC therapy.
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）