CONSTRUCTION AND BUILDING MATERIALS
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2020
·
IF 4.419
Meng Jia,Aimin Sha,Wei Jiang,Wentong Wang,Jiange Li,Jiasheng Dai,Zhen Lu
Poly(ethylene glycol) (PEG) is a latent heat storage material that has potential to regulate the thermal environment within the asphalt pavement via phase-transition process. However, the properties of PEG vary in terms of its average molecular weight. The PEG selection principle is put forward in this study, which is to not only realize satisfactory cooling function but also minimize the adverse effects on asphalt properties. For illustration, the phase change behaviors and thermal stability of PEG were first studied. It is demonstrated that the PEG samples with its average molecular weight within 2000 ~ 20000 (PEG-2 K ~ 20 K) are characterized by suitable phase change temperatures of 41.27 ~ 62.39 °C, fairly great latent heats of 184.8 ~ 211.9 J·g −1 and excellent thermal stability below 300 °C. The larger molecular weight generally corresponds to the higher phase change temperatures, whereas the greatest latent heats occur at PEG-8 K. Despite that, there are marginal differences among the phase change properties of PEG-4 K ~ 8 K. To further select the ideal PEG, tests for asphalt properties were conducted. Results show that based on the negative role of PEG in the high- and low-temperature properties, temperature and stress sensitivities of asphalt binder, it is necessary to encapsulate PEG before use. Therefore, these detrimental roles are required to be considered when selection of PEG. In terms of our selection principle proposed, PEG with a large average molecular weight is usually preferred except PEG-20 K.
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高影响因子
ACS Applied Nano Materials
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2020
·
IF 0
Xiaoyong Ren,Xiao Yang,Guoxin Xie,Jianbin Luo
In this study, black phosphorus quantum dots (BPQDs) have been successfully prepared at a low cost and high yield by the liquid-based high-energy ball milling method. The obtained BPQDs with an average lateral size of 6.5 ± 3 nm and a thickness of 3.4 ± 2.6 nm dispersed stably in ethylene glycol (EG). A robust macroscale superlubricity state (μ, 0.002) was achieved under a high contact pressure of 336 MPa via the lubrication of BPQDs-EG aqueous suspension (BPQDs-EGaq) at the Si3N4/sapphire frictional interface. The wear rate lubricated by BPQDs-EGaq suspension account for 5.96% of that lubricated by EG aqueous solution (EGaq), demonstrating the improvement in the antiwear property with the addition of BPQDs. The rolling effect of BPQDs and the low shear stress between the BPQDs interlamination played important roles in the improvement in the antiwear property. The oxidative products of BPQDs (PxOy) contributed to the effective realization of macroscale superlubricity. This work realized macroscale superlubricity at a high contact pressure by combining the BPQDs with special liquid molecules and provided the great potential in industrial applications.
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DOI
Advanced Healthcare Materials
·
2013
·Vol. 3
·期 2
·261-272
·
IF 0
Chun-Yang Sun,Shuang Dou,Jin-Zhi Du,Xian-Zhu Yang,Ya-Ping Li,Jun Wang
Polyphosphoesters with repeating phosphoester linkages in the backbone can be easily functionalized, are biodegradable and potentially biocompatible, and may be potential candidates as polymer carriers of drug conjugates. Here, the efficacy of a polyphosphoester drug conjugate as an anticancer agent in vivo is assessed for the first time. With controlled synthesis, doxorubicin conjugated to poly(ethylene glycol)- block -polyphosphoester (PPEH–DOX) via labile hydrazone bonds form spherical nanoparticles in aqueous solution with an average diameter of ≈60 nm. These nanoparticles are effectively internalized by MDA-MB-231 breast cancer cells and release the conjugated doxorubicin in response to the intracellular pH of endosomes and lysosomes, resulting in significant antiproliferative activity in cancer cells. Compared with free doxorubicin injection, PPEH–DOX injection exhibits much longer circulation behavior in the plasma of mice and leads to enhanced drug accumulation in tumor cells. In an MDA-MB-231 xenograft murine model, inhibition of tumor growth with systemic delivery of PPEH–DOX nanoparticles is more pronounced compared with free doxorubicin injection, suggesting the potential of polyphosphoesters as carriers of drug conjugates in cancer therapy.
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DOI
PubMed
THERMOCHIMICA ACTA
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2016
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IF 1.938
Chao Wang,Qifeng Li,Liping Wang,Xiaozheng Lan
Size-dependent thermal properties of neopentyl glycol (NPG) embedded in controlled porous glasses (CPGs) are investigated using differential scanning calorimetry (DSC), infrared spectroscopy (FT-IR), and powder X-ray diffraction (XRD). In the nanopores of CPGs (diameter d = 11.5–300 nm), NPG shows depressed solid–solid and solid–liquid phase transition temperatures and latent heats, which decrease as the pore size becomes smaller. In thermal cycling around the solid transition, the nano-sized NPG display stable transition temperature and enthalpy change as the bulk. Supercooling in the solid transition increases with the decreasing pore diameter ( d > 25 nm). From FT-IR and XRD analysis, NPG in the nanopores maintains the same structure as the bulk. The nanoencapsulated NPG is analogous to a series of new phase change materials (PCMs), through which the ideal heat storage performance of the bulk may be handed down.
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
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2024
·Vol. 31
·期 12
·1-11
·
IF 2.6
Wu Peipei,Zhao Yuchang,Zhang Yuwen,Shen Qingyue,Hu Shuaishuai,Chen Shuangjun
Intrinsic moisture permeability of bio-based polymer cellulose diacetate (CDA) is not sufficient for some requirements. Herein, isophorone diisocyanate (IPDI) modified polyethylene glycol (IPEG200) was served as a reactive plasticizer to enhance the water vapor permeability (WVP) of CDA films without plasticizer migration problems. The performances of CDA films were further improved by adding hydrophilic nanometer Al 2 O 3 fillers. Fourier transform infrared spectroscopy (FTIR) was used to the synthesis processes of the prepolymers and their reaction with CDA chains. The crosslinking reaction was indicated by monitoring the gel content. When IPEG200 is 9.66 phr and Al 2 O 3 filler is 5 phr, the WVP is raised to 8.9 × 10 −13 g·cm/cm 2 ·s·Pa, which is much higher than CDA’s. WVP 14.2 × 10 −13 g·cm/cm 2 ·s·Pa of CDA film can be obtained by adding 60 phr PEG600 and 25 phr Al 2 O 3 when using IPEG200 as the compatibilizer. This study provides a simple, feasible, low-cost method for preparing high moisture permeable film by reactive plasticizers.
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DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2018
·
IF 2.197
Yichun Dong,Chengna Dai,Zhigang Lei
Ethylene glycol (EG) is proposed as an entrainer for the separation of methylal and methanol by extractive distillation. The COSMO-RS model was used to screen the suitable entrainer in terms of selectivity and solvent capacity. EG is a suitable entrainer with a low environmental impact. Vapor–liquid equilibrium (VLE) experiments demonstrated that the relative volatility of methylal to methanol is significantly improved using EG as an entrainer. The new corresponding interaction parameters were obtained by correlating the VLE data using the UNIFAC model, and then they were introduced into the process simulation software. The extractive distillation process was simulated using the rigorous equilibrium stage model. The optimal operating conditions were obtained by sensitivity analysis. The simulation results showed that EG is effective and efficient for the separation of methylal and methanol. In addition, the COSMO-RS model provides some theoretical insights into the separation mechanism.
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DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Miaomiao Ma,Yuhong Qi,Qi’an Chen,Zhanping Zhang
Until now, traditional hydrogels have no long-term application in ship antifouling owing to their poor mechanical properties. Herein, the synergetic application strategy of nitrogen-doped carbon dots loaded silica (SiO2@N-CDs) nanoparticles to enhance polyethylene glycol (PEG) hydrogel membrane was proposed. The incorporation of SiO2@N-CDs improves the water retention and mechanical properties of the hydrogel. Importantly, the SiO2@N-CDs/PEG hydrogel exhibits remarkable antiadhesion capacity against bacteria, showing excellent antifouling performance. Fluorescence distribution analysis indicates alterations in the surface and fracture morphology of the hydrogel owing to SiO2@N-CDs, with a “twill-fold” change in fracture. In addition, molecular dynamics simulations show that SiO2 enhances the hydration layer of the hydrogel, contributing to its enhanced water retention effect. These findings provide avenues for the development of ship antifouling materials.
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高影响因子
FUEL
·
2024
·
IF 6.7
Jiuyu Chen,Zhoujie Zuo,Hailong Zhou,Baozhong Zhu,Yunlan Sun
Boron (B) has a good practical application prospect in energetic materials due to its high volumetric and gravimetric heating values. However, the challenge of incomplete combustion inhibited its further application because of the existence of surface boron oxides. Herein, polyethylene glycol (PEG), a kind of oxygen-containing organic matter with an average molecular weight of 2000, was used to modify the B particles at a micron level to improve the combustion performance. The effect of PEG contents on the thermal behavior, heat of combustion, ignition and combustion performance, as well as the combustion intensity of boron powder, was studied. The results showed that the appropriate amount of PEG modification could reduce the ignition temperature of boron powder, increase the degree of oxidation, improve the combustion intensity and heat release. Additionally, the agglomeration behavior of B particles could be alleviated but the improvement diminished with the increase of PEG contents. These results revealed that PEG modification was an efficient strategy to facilitate boron ignition and combustion.
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高影响因子
Case Studies in Construction Materials
·
2025
·
IF 6.6
Miaomiao Ma,Jingyao Ma
To address the issue of insufficient mechanical properties in conventional hydrogels that limit their marine antifouling applications, we innovatively proposed a construction strategy of titanium dioxide (TiO 2 ) nanoparticles reinforced polyethylene glycol (PEG) hydrogels. The TiO 2 -PEG hydrogel with uniformly dispersed nanoparticles were successfully prepared by in-situ polymerization, and the material showed excellent mechanical properties. When the content of TiO 2 is 0.5 wt%, the tensile strength of the TiO 2 -PEG hydrogel can reach 0.97 MPa, which is 68.5 % higher than that of the PEG hydrogel. CLSM analysis shows that TiO 2 nanoparticles effectively enhance the mechanical properties of hydrogels by inducing crack deflection and energy dissipation mechanism. Notably, TiO 2 -PEG hydrogel also has a broad-spectrum antifouling performance, which can effectively resist protein adsorption and adhesion of Escherichia coli, Staphylococcus aureus and diatoms. The structure-property relationship demonstrated that TiO 2 enhanced the TiO 2 -PEG mechanical properties, which inhibited its detachment from the substrate and thereby significantly improved the antifouling durability. This study not only provides new ideas for the design of high-performance marine anti fouling materials, but also provides theoretical basis and practical support for achieving synergistic enhancement of anti fouling performance and mechanical performance.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
·
IF 2.6
Yan Zhang,Gang Li,Yuyuan Xue,Jinxiang Dong
The phase diagram of the ethylene glycol (EG)/1,2-butanediol (BDO) system at 227.05 to 260.25 K was determined and fitted by the modified Apelblat model with an average relative deviation (AARD) of 1.02%. The density and kinematic viscosity of EG/BDO were measured at temperatures of 238.15 to 263.15 K, where the mass fraction of EG was 90.02 to 100%. The experimental results were fitted and regressed by the least-squares method, and the AARD values were 0.04 and 3.04%, respectively. The density and kinematic viscosity had good correlation with the temperature and EG mass fraction. The metastable zone width of EG/BDO was measured. The results showed that the metastable zone width increased with a decrease in the EG content. The thermal conductivity of the EG coarse crystal layer from the EG/BDO mixture, with the mass fraction of EG from 90.25 to 100%, was measured at a temperature range of 250.57 to 258.53 K. The EG coarse crystal layer had a poor thermal conductivity, and its thermal conductivity dependence of temperatures was described by the least-squares method with AARDs smaller than 1.78%. The work provided a theoretical foundation for the melt crystallization separation of coal to EG.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Dandan Li,Xiaoxiao Ji,Xianjing Gong,Fangchang Tsai,Qunchao Zhang,Li Yao,Tao Jiang,Robert K.Y. Li,Hengchong Shi,Shifang Luan,Dean Shi
Si doped-poly(ethylene glycol) ( Si-PEG) hybrid polymer electrolyte with Si O C bonds in the main chain obtains high ionic conductivity even at room temperature because of the more flexible molecule chains. In this work, poly(ethylene glycol)-borate ester (B-PEG) is further covalent bonded into the crosslinked Si-PEG network to form the hybrid solid polymer electrolyte (HSPE). Comparing to previous works in which B-PEG is just added as a plasticizer , the Lewis acidity of boron (B) in the network of polymer chains is less shielded by the connected PEG chains, which is more effective to improve lithium ion transference number ( t L i + ) and reduce the interfacial polarization of LiFePO 4 /HSPE/Li cells by attracting the anions of lithium salt . The t L i + increases monotonously along with the increase of B-PEG contents in HSPE, while the ion conductivity has a peak value. When B-PEG content is 23.1 wt%, the highest ionic conductivity of the hybrid polymer electrolyte reaches up to 1.6 × 10 −4 S/cm and t L i + is 0.68 at 25 °C. And the initial capacity of LiFePO 4 /HSPE/Li cells are 120 mAh/g and 90 mAh/g at 0.5C and 1C at 25 °C. After 100 cycles under 1C at 25 °C, the capacity retention of the LiFePO 4 /HSPE/Li cell is 84%, which is higher than that of 65% for LiFePO 4 /PSPE/Li cell. (PSPE indicates the Si-PEG polymer electrolytes with B-PEG just as plasticizer).
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高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2014
·Vol. 17
·期 6
·1089-1097
·
IF 1.352
Guo Shengnan,Sun Xiaowen,Zou Qichao,Zhang Jinzhi,Ni Hong
A series of cationic gemini surfactants containing two dimethylalkylammonium chains linked by ethylene glycol bisacetyl spacers were synthesized [G
m -A n A- m
, G = gemini surfactant, m = 12 (–C 12 H 25 ), 14 (–C 14 H 29 ), or 16 (–C 16 H 33 ), A = acetyl, and n = 2, 3, or 4 is the number of ethylene glycol units in the spacers]. Because of the inductive effect of the oxygen atom in the spacer, acylation can take place using chloroacetyl chloride instead of bromoacetyl bromide which helps to limit the use of environmentally harmful reagents. Critical micelle concentrations were determined using conductivity measurements. The antibacterial activities of the surfactants against Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli were evaluated from the minimum inhibitory concentration (MIC), minimum bacterial concentration, a time–kill study, and the inhibitory zone. Increasing the length of the spacer did not result in an obvious change of antibacterial activity. However, increasing the length of the alkyl chain apparently increased the antibacterial activity against S. aureus but decreased the antibacterial activity against E. coli . The G 12-A2A-12 surfactant had the lowest CMC of 1.26 mmol L −1 and exhibited the best antibacterial activity with a MIC of 32 μg mL −1 toward S. aureus and 64 μg mL −1 toward E. coli in the presence of 10 5 CFU of bacteria. This work indicated that these cationic gemini surfactants have potential applications as antibacterial agents and emulsifiers.
研究领域:
化学
·
微生物学
·
药学
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高影响因子
危险品化学品经营许可证（带存储）