CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Fenglei Bi,Jianqiang Shao,Zhenhao Xi,Ling Zhao,Di Liu
Poly( m -xylylene adipamide)/poly(ethylene terephthalate) (MXD6/PET) copolymers are synthesized by melt copolycondensation with 1–5 wt% low molecular weight PET oligomers into the MXD6 oligomers at 260 °C. FR-IR and 1 H NMR analysis results indicate that the interchange reaction has occurred between MXD6 oligomers and PET oligomers. The thermal behavior of copolymers shows that the melting temperature of MXD6/PET copolymers decreases with the increasing of amount of PET oligomers, while the crystallization temperature accordingly increases. And the equilibrium temperature T m 0 is evaluated to be 251.8 °C for the copolymers with 5 wt% PET oligomer adding, which is very close to that of neat MXD6. The tensile and impact strength of MXD6/PET copolymers are significantly improved than that of pure MXD6 by mechanical properties test, and the microfibril structure in the impact fracture sample's surface reveals the feature of ductile fracture.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Ruru Zhou,Yuanyuan Jiang,Huaiyuan Zhao,Boyong Ye,Lina Wang,Zhaoyin Hou
Acetalization of glycerol with acetone could convert surplus glycerol into an important fuel additive (solketal). In this work, a stable solid acid catalyst was synthesized in a facile polycondensation of p -phenolsulfonic acid on KH560 modified SiO 2 (PSF/K-SiO 2 ) and used in the acetalization of glycerol at room temperature. Characterization results confirmed that PSF/K-SiO 2 possessed larger surface area and surface acidity than that of PSF resin (copolymer of p -phenolsulfonic acid and formaldehyde) and non-modified SiO 2 supported PSF resin (PSF/SiO 2 ). As a result, PSF/K-SiO 2 was extremely active and stable in the acetalization of glycerol. At 25 °C, the detected conversion of glycerol reached 86.3% with a 97.7% selectivity of solketal at 1.5 h. The best yield of solketal over PSF/K-SiO 2 could reach 93.1 g-solketal/g-cat/h, and PSF/K-SiO 2 could be recycled at least 5 times without obvious decrease in reactivity.
研究领域:
化学工程
·
催化化学
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产品关联
DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 2
·528
·
IF 2.8
Jianghao Xie,Huizhe Zheng,Jie Jiang,Zhenhao Xi,Ling Zhao
Poly (butylene succinate-butylene terephthalate) (PBST) is a novel high-performance degradable copolyester that combines the advantages of aliphatic polyester and aromatic polyester. This study investigated the intricate reaction kinetics and mass transfer in the PBST polycondensation process using static thin-film experiments. The findings suggest that the apparent reaction rate escalates with increasing temperature, decreasing pressure, and thinner film thickness. Based on the pseudo-steady state assumption, an overall apparent rate model encompassing both reaction kinetics and mass transfer was formulated, and the model was employed to simulate the coupling effects of reaction and mass transfer on the PBST polycondensation process. The simulation results reveal that film thickness has the most significant effect on the degree of side reaction. Film thickness primarily influences the accumulation of BDO(1,4-Butanediol) in the melt during the early stages of the reaction, where BDO accumulates in the melt and intensifies the side reaction under thicker film. And pressure has the most substantial influence on the concentration of BDO as the reaction approaches equilibrium. Additionally, the sensitivity of the growth of molecular weight to pressure is notably higher at low film thickness.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2024
·
IF 2.7
Chinnasamy Veerakumar,You Nayoung,Cho Honghyun
Developing competent energy storage materials is crucial for efficient thermal energy storage and utilization. Microencapsulated lauryl alcohol as phase change material using SiO 2 shell was prepared through a novel one-pot synthesis of interfacial polycondensation using tetraethyl orthosilicate as a shell precursor. The thermal properties were analyzed through differential scanning calorimetry, which revealed that the melting and freezing points of microcapsules were 23 °C and 18.9 °C, respectively. For melting and freezing, the estimated latent heats were 90 J g −1 and 88.2 J g −1 , respectively. Thermogravimetric analysis confirms that the microcapsules are stable at a higher temperature. Besides, the leak test of the developed microcapsules was performed to investigate the stability during the melting process. Moreover, the prepared microcapsules (MPCM2) show stable and excellent thermophysical properties after 500 thermal cycles, which shows that the developed microcapsule is an ideal candidate for thermal energy storage. Graphical abstract
研究领域:
材料科学
·
能源工程
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Zhihong Tian,Jiajia Huang,Xin Zhang,Gonglei Shao,Qiuyun He,Shaokui Cao,Siguo Yuan
High adsorption capacity and selectivity of microprous carbon are critical for exceptional post-combustion CO 2 capture ability. Herein we report a novel strategy to prepare N-doped microprous carbon with high surface area (2363 m 2 g −1 for CPTHB-7), narrow pore size distribution and high ultramicropore ratio (<0.7 nm, 68% for CPTHB-6) via a simple chemical activation of a rigid polymer porous framework (PTHB) synthesized via polycondensation reaction of 1,3,5-THB and aniline. The as-prepared microprous carbon exhibit high CO 2 adsorption capacities of 5.6–6.3 mmol g −1 (273 K and 1 bar) and sufficient CO 2 /N 2 selectivity of 12–22 for a 0.15/0.85 CO 2 /N 2 mixture at 298 K and 1 bar (conditions of CO 2 capture application). The effect of microporosity and N content for our materials on the CO 2 adsorption performance had also been investigated. Microporous volume below critical size contributed to the adsorption capacity for CO 2 , while the N content and nitrogen species play a role in the CO 2 /N 2 selectivity.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2013
·Vol. 2
·期 5
·577-584
·
IF 0
Qinghua Yang,Longgang Wang,Weifeng Lin,Guanglong Ma,Jiang Yuan,Shengfu Chen
In this work, nonfouling polypeptides with homogenous alternating charges were synthesized by polycondensation of the covalently bonded dimer of glutamic acid (E) and lysine (K) (EK dimer) with benzyloxycarbonyl (Z)-protected side chains. This facile method successfully solved the uniformity problem of nonfouling peptides caused by the copolymerization of two different monomers and enabled the incorporation of various terminal functional groups for future applications. The molecular weights (MWs) of the nonfouling peptides can be easily controlled by the ratio of the terminal group, lipoic acid, to the EK dimer. The nonfouling peptides can form self-assembling monolayers (SAMs) on a gold surface through two terminal thiol groups, which were characterized by attenuated total reflection Fourier transform infrared (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and ellipsometry (ELL). The resistance to nonspecific protein adsorption, cell attachment and bacterial adhesion of these nonfouling peptide SAMs and the in vitro cytotoxicity and haemolytic activity of these peptides were also evaluated. The results show that the lowest relative protein adsorptions of antibody (anti-IgG) and fibrinogen (Fg) on the SAMs are 5.1 ± 1.6% and 7.3 ± 1.8%, respectively, determined by enzyme-linked immunosorbent assay (ELISA), where the protein adsorption on a tissue culture polystyrene (TCPS) surface was set to 100%. Almost no obvious cell attachment and bacterial adhesion were observed, and no cytotoxicity and no haemolytic activity in vitro were detected. With the advantages of biocompatibility, biodegradability and the abundance of moieties for ligand immobilization, these nonfouling peptides developed by the facile method can be used in a wide range of biomedical applications.
研究领域:
生物材料学
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生物化学
·
医学工程
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产品关联
DOI
PubMed
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 10
·47161
·
IF 1.901
Baofeng Hou,Hong He,Ruixiu Jia,Meilong Fu,Yanbin Cao,Shaoqun He,Liwen Luo,Youqing Huang
The synthesis and performance of a novel temperature-tolerant foamed resin for enhanced oil recovery were investigated using various methods, including infrared, NMR, scanning electron microscopy (SEM), and displacement experiments. Polycondensation of furfuryl alcohol prepolymers was confirmed by the infrared and NMR results. The poor temperature tolerance of furfuryl alcohol prepolymers after gelation at high temperatures is mainly due to the fracture of furan rings. The addition of ester additives is an effective method of increasing the temperature tolerance of the prepared foamed resins and can effectively reduce the weight-loss rate of the polycondensation products. The SEM results show that the skeleton structure of the foamed resin remains intact after high-temperature treatment. Thus, the novel plugging agent system has excellent thermal stability and still has a high strength (>0.8 MPa) after high-temperature aging treatment for 40 days, giving the prepared foamed resin a good plugging performance (plugging rate > 91%) at 250 °C. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47161.
研究领域:
石油工程
·
材料科学
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产品关联
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Xiaochun Hu,Yuqing Luo,Xianyue Wu,Jiabin Niu,Mingwu Tan,Zhiqiang Sun,Wen Liu
Heteroatom-doped microporous carbon nanosheets (HMCNs) are used in a wide range of applications, including gas adsorption, energy storage, and catalysis. Here, we demonstrate a solvent-free, template-free, one-pot polycondensation approach for the synthesis of HMCNs using melamine (MEL) and pentaerythritol (PER) as precursors. By varying the ratio of MEL to PER and the pyrolysis temperature, the doping amount, surface area and porosity of the HMCNs can be controlled. When used for CO 2 capture, the HMCN synthesized by the pyrolysis of a 3:2 mixture of MEL and PER at 900 °C (3/2-HMCNs-900) affords a CO 2 uptake of 5.35 mmol g −1 at 273 K and 1 bar CO 2 partial pressure. Density functional theory calculations suggest that the high CO 2 uptake performance of the HMCNs is associated with the chemical modification of the surface, as a result of N- and O- co-doping. When assembled in a supercapacitor , 3/2-HMCNs-900 exhibits a high specific capacitance (475 F g −1 at 1.3 A) and a fast charge-discharge rate of 13.3 F s −1 g −1 . This study presents a novel, resource-efficient and environmentally friendly method for preparing HMCNs for energy and environmental applications.
研究领域:
材料科学
·
能源与环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yan Li,Tao Li,Long-Qiang Xiao,Yue-Fei Zhang
The polycondensation of 2-pyrazolines is presented. The products are oligomers with the five-membered rings of the 2-pyrazoline as the backbone and the reaction is a polycondensation reaction by decomposition of ROH from the hydrogen atom in the −NH– group and the −OR in the ester group. Metal catalysts, reaction periods, and the addition amounts of the catalyst are investigated to optimize the reaction conditions. The products are down-/up-conversion fluorescence molecules that can significantly enhance cell imaging through the synchronized excitation of visible and near-infrared light and may be widely used in other optical fields.
研究领域:
材料科学
·
化学
·
生物医学工程
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产品关联
DOI
高影响因子
PLoS One
·
2016
·Vol. 11
·期 3
·e0150412
·
IF 3.057
Sheng Geng,Sharui Shan,Hanjun Ma,Benguo Liu
In order to investigate polymeric flavonoids, the polycondensate of catechin with glyoxylic acid (PCG) was prepared and its chemically antioxidant, cellular antioxidant (CAA) and α -glucosidase inhibitory activities were evaluated. The DPPH and ABTS radical scavenging activities and antiproliferative effect of PCG were lower than those of catechin, while PCG had higher CAA activity than catechin. In addition, PCG had very high α -glucosidase inhibitory activities (IC 50 value, 2.59 μg/mL) in comparison to catechin (IC 50 value, 239.27 μg/mL). Inhibition kinetics suggested that both PCG and catechin demonstrated a mixture of noncompetitive and anticompetitive inhibition. The enhanced CAA and α -glucosidase inhibitor activities of PCG could be due to catechin polymerization enhancing the binding capacity to the cellular membrane and enzymes.
研究领域:
食品科学
·
药理学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 79
·75793-75804
·
IF 3.289
Haiming Cheng,Huafei Xue,Changqing Hong,Xinghong Zhang
Organic aerogels generally exhibit poor thermal, mechanical and hydrophilic properties, which seriously restrict their large-scale applications. In this study, siliane was introduced into resorcinol-furfural (RF) aerogels due to the enhancement of silicone to thermal stability and hydrophobicity of polymer molecules. Resorcinol-furfural/silicone (Si–RF) hybrid aerogels were synthesized by sol–gel polycondensation of resorcinol, furfural, (3-aminopropyl) triethoxysilane (ATPES) and methyltrimethoxysilane (MTMS), followed by ambient pressure drying (APD). The Si–RF aerogels showed an interpenetrating framework with high mesoporosity. Silicon-containing functional groups were successfully incorporated into the RF aerogels in dehydration reactions. Surface area, characteristic thermal degradation temperature and char yield of the Si–RF aerogels are higher than that of the as-prepared RF aerogels. In order to improve the mechanical properties, carbon fabric reinforced Si–RF aerogel composites were prepared by impregnating a carbon-bonded carbon fiber (CBCF) composite with the hybrid aerogels. The obtained composites possessed a low bulk density (0.309–0.375 g cm−3), high compressive strength (0.759–2.940 MPa for different directions) and low thermal conductivity (0.085–0.136 W (m−1 K−1)). Hydrophobic aerogels were also fabricated by –Si(CH3)3 (trimethylsilyl substituent) modification via immersing fresh Si–RF aerogels in trimethylethoxysilane (TMES)/hexane solution followed by aging and APD. The hydrophobic property was promoted by the concentrations of solutions (water contact angle of about 108–135°), also the thermal stability.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhulin Li,Zijin Zhao,Xiaojing Jiang,Yingjuan Fu,Guoyu Tian,Zhaojiang Wang
Carbon hollow microspheres (CHM) have been heralded as a seminal material, manifesting a multifaceted utility in domains such as catalysis, adsorption, energy storage, and conversion. In this study, the present investigation delves into the fabrication of lignin-formaldehyde resin (LFR) carbon hollow microspheres (LFR-CHM) via the nuanced methodologies of spray drying and subsequent carbonization . The precursor for CHM, a thermosetting LFR, was crafted via polycondensation in an alkaline milieu. Precision-tuning of the spray drying parameters enabled the realization of LFR hollow microspheres, characterized by particle diameters spanning 3.37 μm–24.4 μm, and shell thickness between 0.25 μm and 4.0 μm. Adjusting the inlet temperature from 110 to 180 °C resulted in LFR hollow microspheres with varying bulk densities from 0.31 g/cm 3 to 0.49 g/cm 3 . The microporous structure of the LFR-CHM shell exhibited a malleable specific area and pore dimensionality, intricately tethered to the carbonization thermal gradient . Furthermore, changes in crystallinity and chemical bonds of LFR-CHM were noted during carbonization process. Significantly, the residual weight of LFR-CHM reached 52 % after carbonization at 800 °C, underscoring the benefits of using thermosetting lignin-formaldehyde resin as a CHM precursor.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
能源存储与转换
✓ 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）