CHEMICAL PAPERS
·
2021
·Vol. 75
·期 10
·5561-5569
·
IF 2.097
Shao Tantan,Gong Yilu,Chen Xiaolong,Chen Lijun
Novel self-crosslinking long fluorocarbon acrylate polymer latex has been successfully prepared by semi-continuous seeded emulsion polymerization with methyl methacrylate(MMA), butyl acrylate (BA), dodecafluoroheptyl methacrylate (DFMA) and hydroxypropyl methacrylate(HPMA) as main monomers, 10-undecylenic acid (10-UA) and diallyl phthalate (DAP) as functional monomers. During the latex polymerization, the monomers were emulsified by the mixed surfactants of nonionic surfactant alcohol ether glycoside (AEG) and anionic surfactant sodium dodecylbenzene sulfonate (SDBS), and initiated by potassium persulfate (KPS). The resultant latex showed excellent properties. The chemical composition of latex was determined with Fourier transform infrared spectrum (FTIR) and the glass transition temperature (Tg) of polymer was detected by differential scanning calorimetry (DSC) and the water repellency of the prepared film was measured by water contact angle measurement (WCA). The reaction conditions were optimized and obtained as follows: the optimal monomer dosage was MMA: BA: DFMA: HPMA = 12.75:12.75:0.9:1.2, the amount of 10-UA and DAP was both 4% of all monomers, the dosage of AEG: SDBS was 5% (1:1) and KPS was 0.5%, respectively. The result indicated that the conversion of the mixed monomers was more than 98% and the coagulation was less than 1% and the resultant latex also had the outstanding appearance and latex performance.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·2930-2940
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IF 3.288
Jun Zhu,Jie Li,Chao Sang,Yunjun Luo
Waterborne polyurethane (WPU) based polymeric dyes with anthraquinone chromophores were developed to realize coloring textiles and improve color fastness. The preparation of polymeric dyes through the reaction of 1,4-diamino-2,3-diphenoxyanthraquinone (DV26) and NCO-terminated prepolymer was monitored via UV absorption spectroscopy. With the progress of the reaction, the intensity of the absorption peak of the primary amine group at 586 nm decreased as a function of reaction time. Thus, the conversion of DV26 at different times and the reaction end point could be determined. The reaction mechanism corresponded to an autocatalytic reaction equation, basically. In addition, the results of performance tests showed that the polymeric dyes exhibited good emulsion stability, ultra-low migration percentages, good water resistance and excellent thermal stability. Moreover, the application properties of DWPU on coated polyester fabrics were satisfactory.
研究领域:
材料化学
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纺织科学
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染料化学
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DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yunlei Zhou,Yunpeng Qu,Liting Yin,Wenna Cheng,Yongan Huang,Runhua Fan
In this work, a type of unique flexible and ultra-stretchable microtextiles was fabricated by coassembly of Ag nanowires (AgNWs) and thermoplastic polyurethane (TPU) microfibers . The microtexiles show tunable and weakly negative permittivity at a low filler content of 1.0–2.4 wt%. The resonance-induced negative permittivity observed in the AgNW/TPU microtextiles below the percolation threshold ( f c ) is attributed to the electric dipole moment of the isolated AgNWs, and this phenomenon can be explained by the Lorentz model. When the AgNW content exceeds the f c , the low-frequency collective plasma oscillation of the AgNW networks in the composites triggers the tunable plasma-type negative permittivity, which agrees with the Drude model. Additionally, the inductive character of the composites was assessed with the reactance spectra. The as-prepared Ag/TPU microtextiles could be a good candidate for the applications of garment integrated electronic, novel sensors, electromagnetic cloaking, and wearable electronic devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Advanced Industrial and Engineering Polymer Research
·
2019
·
IF 0
Han Hu,Ruoyu Zhang,Zhengyang Kong,Kai Wang,Wu Bin Ying,Jinggang Wang,Jin Zhu
Poly (butylene furandicarboxylate) based poly (ether ester), with poly (ethylene glycol) (PEG) molecular weight from 600 to 20 K g mol −1 and mass fraction of hard segments fixed at 50%, are synthesized through transesterification and melt polycondensation. When M n (PEG) is less than 1500 g mol −1 , the copolymers tend to be homogeneous. The tendency of microphase separation is facilitated by the increasing M n (PEG). The mechanical properties and water swelling are influenced by M n (PEG), equilibrium water-uptake and PEG crystals. Elastic modulus of samples with no PEG crystals vary from 34 to 64 MPa, with elongation at break exceeding 1000%. The hydrolytic degradation is strongly affected by M n (PEG), degradation medium and alkalinity. The degradation of copolymers with short PEG (<1500 g mol −1 ) could be accelerated by ions and increasing alkalinity in medium. For copolymers with M n (PEG) from 2 K to 6 K g mol −1 , the degradation rate is relatively slow, due to relatively long PBF segments and improved PBF crystals hindering the hydrolysis of ester bond. For copolyesters of PBF50-PEG10K and 20 K, the oxidation of PEG dominates the degradation behavior while the PBF segments can hardly be damaged. The drastic degradation of these samples takes place in the solutions of pH = 12, suggesting the high alkalinity can break the long PBF segments. The distinct degradation behavior of the copolymers conduces to realize tuned hydrolysis for different biomedical applications.
研究领域:
材料科学
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生物医学工程
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DOI
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Xiaona Dong,Ruonan Feng,Yuanming Jiang,Tianming Cai,Canlan Jiang
Soil contamination by triphenyl phosphate (TPHP) has posed a potential threat to human health. In this study, the degradation of TPHP by different chemical oxidation methods, including H 2 O 2 , persulfate (PS), peroxymonosulfate (PMS), ferrous ions (Fe 2+ ) activated H 2 O 2 , Fe 2+ activated PS, heat activated PS (heat-PS), and heat activated PMS, was compared. Heat input could promote the activation of PS to generate highly reactive species (HRS) and the aqueous availability of TPHP for more efficient degradation of TPHP in soil than other methods. As reaction temperature rose to melting point of TPHP (50 o C), the degradation rate sharply increased. The activation energy ( Ea ) of TPHP degradation in soil was caculated to be 115.57 kJ mol -1 . The oxidation capacity per unit PS was about 22.0 M -1 . Sulfate radicals (SO 4 •− ) and hydroxyl radicals (•OH) were the major HRS for TPHP degradation in heat-PS system. With increasing of soil-water ratio, the inhibitory effect of soil organic matter (SOM) on TPHP degradation was significantly enhanced. The degradation efficiency was highest under weakly acidic conditions (pH ≈ 4.8). Cl − significantly inhibited the degradation of TPHP in heat-PS system, while HCO 3 − and H 2 PO 4 − had little effects on the degradation of TPHP. After reaction, TPHP in soil could be degraded to be less toxic para -hydroxy triphenyl phosphate ( p -OH-TPHP), diphenyl phosphate (DPHP), and phosphate ions (PO 4 3− ). This study discloses a sustainable strategy for the remediation of OPFRs-contaminated soil by utilizing heat-PS method.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
HORTSCIENCE
·
2021
·Vol. 56
·期 8
·909-914
·
IF 1.455
Asma Mohammed Saeed Al-Kubati,Baoshan Kang,Liming Liu,Aqleem Abbas,Qinsheng Gu
Zucchini yellow mosaic virus (ZYMV) causes serious damage to cucurbit crops worldwide and can be spread by aphids, by mechanical injury, and in seeds. With the popularization of cucurbit grafting, the use of susceptible rootstock has increased the risk of ZYMV infection in cucurbit crops. In China, the bottle gourd (Lagenaria siceraria) is a widely used rootstock in grafted watermelon production. However, few resistant bottle gourds are available commercially. This study developed bottle gourd lines resistant to ZYMV using ethyl methanesulfonate (EMS) mutagenesis. A new mutated bottle gourd population (M1) was generated by treating seeds with EMS. Diverse phenotypes were observed in the seedlings, flowers, and fruit of M2 plants, some of which are of potential commercial interest, such as dwarfing and different fruit shapes. Based on the M2 phenotypes, 106 M3 lines were selected and screened for resistance to ZYMV by mechanical inoculation and agroinfiltration. Nine M3 lines were resistant to ZYMV during three tests. One inbred M4 line (177-8) was developed and showed stable resistance and no virus when tested using a double-antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) and polymerase chain reaction. These resistant lines are promising materials for developing watermelon rootstock and exploring resistance genes as new ZYMV-resistant resources. EMS induction could be a practical strategy for creating resistant cucurbit crops.
研究领域:
植物学
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遗传学
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作物科学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 44
·27183-27192
·
IF 3.361
Jie Liu,Feifei Zhang,Zhendi An,Wanpeng Shi,Hong Li
An amino-terminated hyperbranched polymer (A-HP) was employed to modify leather buffing dust (BD) to prepare functional filler, hyperbranched buffing dust (HBD). The structure and morphology of BD and HBD were characterized by XPS, DSC and SEM. Furthermore, HBD was added into the typical solvent type polyurethane (PU) to prepare a wetting PU film which was used as the coating for synthetic leather. By changing the dosage of HBD, the filler species, the properties of the porous structure and mechanical strength of the PU film were analyzed by SEM, DMA and so on. The experimental results indicated that with the increase of the dosage of HBD, the porous structure of the PU film increase. The content of the N element for BD increases from 4.27% to 7.29%. After modification and ball milling, the fineness of most fibers was in the range of 6.7–6.9 μm. The fiber dispersion state of HBD was more uniform. The Tg of the PU film with HBD is −8.67 °C, while for lignin is −8.41 °C, indicating that the wetting PU film filled with HBD has better flexibility at low temperature.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Mei Mingjie,Zhao Jiangui,Fang Hu,Sun Zuowei,Xue Weichao,Fu Haiyan,Li Ruixiang,Chen Hua,Li Chen,Yang Chunji,Zheng Xueli,Yuan Maolin
1,4-Butanediol, an important chemical raw material, especially as the monomer of engineering plastic polyethylene terephthalate (PBT), plays a pivotal role in contemporary chemicals. A promising parallel approach is the linear-selective hydroformylation of inexpensive allyl acetate, which is economical yet challenging. Herein, we describe an atom-economic approach characterized by high selectivity for synthesizing 4-oxobutyl acetate through rhodium-catalyzed hydroformylation using allyl acetate. This protocol affords the intermediate of valuable 1,4-butanediol in excellent yield (up to 95%) and exhibits excellent regioselectivity (linear/branched up to 164) under mild conditions (60 °C, 10 bar of syngas), effectively minimizing the formation of decomposed byproducts. The success of this protocol hinges on the use of a "Rh/POP-type ligand" in combination with either acetic acid or bulky anionic salts as additives. Preliminary mechanism studies show that the use of CH 3 COOH facilitates the formation of a tridentate κ 3 -P,O,P-coordination, which prevents the coordination of carbonyl with the Rh center, leading to the relatively high linear selectivity of 4-oxobutyl acetate. Furthermore, the successful application of this protocol in synthesizing 4-oxobutyl acetate at a scale of 3.8 g, employing low Rh-loading (0.05 mol%), highlights its potential for industrial applications. Graphical Abstract
研究领域:
化学工程
·
催化化学
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DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2020
·
IF 2.952
Jian Ou,Xin Yuan,Yu Liu,Panliang Zhang,Weifeng Xu,Kewen Tang
Enzyme immobilization in MOFs offers retained enzyme integrity and activity, enhanced stability, and reduced leaching. In this work, Pseudomonas cepacia lipase (PCL) was successfully immobilized into the Zeolitic imidazolate framework-8 (ZIF-8) by physical adsorption. The amounts of PCL in the immobilized enzyme (PCL@ZIF-8) was determined to be 16.7 % (200.5 mg PCL/g ZIF-8). Furthermore, the immobilized enzyme was applied as efficient bio-catalyst for enantioselective hydrolysis of 2-phenylpropionic acid (2-PPA) ester enantiomers and enantioselective transesterification of 1-phenylethanol enantiomers. The enzymatic activity of the immobilized enzyme was three times more than that of free PCL in enantioselective hydrolysis system, and the enantiomeric excess was maintained above 99 %. There was no significant difference in enzyme activity between immobilized PCL and free PCL in transesterification system. In addition, the immobilized enzyme showed good reusability in both hydrolysis (30.57 % of initial activity, 4 cycle) and transesterification reaction systems (64.38 % of initial activity, 6 cycle).
研究领域:
生物化学
·
酶工程
·
材料科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
XiuLi Wang,Yinguang Lu,Longyan Shi,Dezhi Yang,Yaling Yang
A quick and simple sample extraction method was demonstrated for the liquid-liquid microextraction of seven phthalate acid esters (PAEs) using acid-base induced deep eutectic solvent (DES) with vortex-mixing assistance. The binary and ternary DESs were prepared by a range of fatty acids (C8-C12) and menthol, which ones act as hydrogen bond donors and acceptors respectively. Fatty acids and menthol served as an extraction solvent and a pH-dependent phase based on the acid-base reaction caused by the adjustment of the pH of the solution. Additionally, the extraction efficiency of the deep eutectic solvent (DES) was improved by adding the emulsifier sodium hydroxide. Hydrochloric acid was used as a phase separation agent. Additionally, the key parameters were optimized through orthogonal array experimental design and statistical analysis. Under the optimal extraction conditions, good linearity of the method was obtained in the concentration range from 1 to100 μg mL −1 for phthalate esters, and preconcentration was completed within 5 min. The limits of detection (LODs) was 1.06–4.55 ng mL −1 , respectively. The spiked recovery values of actual samples were in the range of 83.9%–107.0% with relative standard deviations (RSDs) of 1.63–4.44%. The quantification limits of the seven phthalates were 3.20 to 13.61 ng mL −1 . Thus, the overall experimental results revealed the promise of deep eutectic solvent (DES) for support in determining phthalate acid esters (PAEs). Therefore, this method could be used for the determination of seven phthalate acid esters in packaged milk samples.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·
IF 1.992
Song Zhang,Jian Xiong,Wenyong Lou,Zhengxiang Ning,Denghui Zhang,Jiguo Yang
This study was designed to synthesize triglycerol monolaurate (TGML) with Lipozyme 435 as the catalyst, and explore its effects on the growth of Aspergillus parasiticus ( A. parasiticus ) and Aspergillus flavus ( A. flavus ) and the secretion of aflatoxin b1. The highest content of TGML (49.76%) was obtained at a molar ratio of triglycerol to lauric acid of 1.08, a reaction temperature of 84.93°C, a reaction time of 6 h and an enzyme dosage of 1.32%. After purification by molecular distillation combined with the washes with ethyl acetate and water, the purity of TGML reached 98.3%. Through characterization by electrospray-ionization mass spectrometry, infrared spectrum and nuclear magnetic resonance, the structure of TGML was identified as a linear triglycerol combined with lauroyl at the end. Finally, the inhibitory effects of TGML on the growths of A. parasiticus and A. flavus and the secretion of aflatoxin b1 were evaluated by measuring the colony diameter, the inhibition rate of mycelial growth and the content of mycotoxin in the media. The results indicated that TGML had a stronger inhibitory effects on colony growth and mycelial development of both toxic molds compared to sodium benzoate and potassium sorbate, and the secretions of toxins from A. parasiticus and A. flavus were completely suppressed when adding TGML at 10 and 5 mM, respectively. Based on the above results, TGML may be used as a substitute for traditional antifungal agents in the food industry.
研究领域:
食品科学
·
微生物学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 19
·11448-11462
·
IF 10.7
Jean Damascene Ndayambaje,Irfan Shabbir,Li Dong,Qian Su,Weiguo Cheng
The conversion of carbon dioxide (CO2) into valuable industrial materials effectively combats rising emissions and facilitates carbon recycling, which requires a top-tier catalyst. In this study, a series of dicationic pyrazolium ionic liquids were grafted onto pre-functionalized MCM-41, and the resulting CnPz–APTES/MCM-41 (n = 3–6), which integrate hydrogen bond donors, Lewis basic tertiary amines (dual N+ sites), nucleophilic ionic sites, high surface areas, and mesoporous structures, were employed as catalysts in the cycloaddition of CO2 and epoxides to yield cyclic carbonates. Among them, C6Pz–APTES/MCM-41 exhibited excellent catalytic performance achieving 98.2% PC yield and 100% selectivity under mild reaction conditions (70 °C and 0.5 MPa CO2 pressure) without a metal, co-catalyst, or solvent. The effect of reaction parameters on the production of cyclic carbonates was thoroughly investigated. Furthermore, C6Pz–APTES/MCM-41 could be efficiently recovered and reused six times without loss of its catalytic activity. It also showed significant adaptability to different epoxides. Structure–activity studies indicated that PO activation was synergistically promoted by the presence of C3/C5 hydrogens from dicationic pyrazolium rings bound by alkyl linkers and dibromide ions in CnPz–APTES/MCM-41. Finally, the reaction mechanism was further investigated using X-ray photoelectron spectroscopy (XPS), proton nuclear magnetic resonance (1H NMR), and density functional theory (DFT) computations.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）