Journal of the American Chemical Society
·
2023
·
IF 15
Hongjun Yang,Jinfeng Huang,Yiye Song,Hongxin Yao,Wenyan Huang,Xiaoqiang Xue,Li Jiang,Qimin Jiang,Bibiao Jiang,Guangzhao Zhang
Copolymerization of elemental sulfur (S8) with vinyl monomers to develop new polymer materials is significant. Here, for the first time, we report the anionic hybrid copolymerization of S8 with acrylate at 25 °C, yielding a copolymer with short polysulfide segments; i.e., each of them consists of only one to four sulfur atoms. The formation of a longer polysulfide segment would be ceaselessly disrupted by carbon anions through the chain-transfer reaction. The copolymer of S8 with diacrylate was cross-linked and exhibited excellent mechanical properties, with an ultimate tensile strength as high as 10.7 MPa and a breaking strain of 22%. Furthermore, the introduction of tertiary amide groups to the copolymer enabled it not only to be reprocessed via press molding at room temperature but also to exhibit self-healing properties without external intervention. This study provides a facile strategy to synthesize high-performance sulfur-based copolymers under mild conditions.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Zhixiong Luo,Somboon Chaemchuen,Kui Zhou,Andres Alvarado Gonzalez,Francis Verpoort
A series of metal organic frameworks (MOFs) MDABCO (M = Co, Ni, Cu, Zn; DABCO = 1,4-diazabicyclo[2.2.2]octane) are utilized as catalysts for the bulk ring-opening polymerization of l -lactide. The catalytic activity varies in the order CuDABCO, NiDABCO < ZnDABCO, CoDABCO. By adding lactic acid, we unexpectedly observed enhanced catalytic activity. The combined use of lactic acid and ZnDABCO during polymerization results in a highly active polymerization system, along with the gradual change of MOFs structure caused by an increased acid concentration. Compared to related homogeneous fragments, such as zinc nitrate and 1,4-diazabicyclo[2.2.2]octane, ZnDABCO is found to afford highly isotactic polylactide, which would be ascribed to the unique structural properties of MOFs.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2021
·Vol. 36
·期 3
·503-511
·
IF 1.04
Yazhou Xu,Songlin Dai,Liangwu Bi,Yuxiang Chen
A series of tung oil-rosin-based polyester (TRP) used as internal sizing agents were prepared using rosin, tung oil, maleic anhydride, and glycerol. TRP structure and properties were examined using Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). The TRP latexes were subsequently used as internal sizing agents, and the sizing properties were evaluated using a scanning electron microscope (SEM), a video-based dynamic contact angle measuring device and a Cobb absorbency tester. The optimal conditions for preparing the TRP sizing agent were as follows: the hydroxy-carboxyl ratio of the material was 0.25; the maleic anhydride dosage was 20 % of rosin; and the tung oil dosage was 40 % of rosin. Under the best conditions, the sized paper Cobb-60 was 15.6
g
/
m
2
, the tensile index was 45.1 N·m/g, the burst index was 3.1 kPa·
m
2
/g, and the tear index was 15.6 mN·
m
2
/g.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2019
·
IF 0
Pingfeng Fu,Lianghua Wang,Yanhong Ma,Zongwu Hou
To separate sulfide minerals from ores, xanthates are widely used as flotation collectors in global mining industry. However, nearly half of xanthates dosed into flotation circuits are discharged into flotation effluents. Residual xanthates and byproducts must be removed because of their toxicity to animals and detrimental effects on mineral flotation. In this work, the degradation of ethyl xanthate (EX) collector by O 3 , UV 254nm , UV 185+254nm , O 3 /UV 254nm and O 3 /UV 185+254nm was compared. The TOC and SO 4 2− concentrations were measured to study the mineralization of EX. The generation of CS 2 and H 2 S byproducts was investigated in both aqueous and gaseous phases. The degradation rate and mineralization extent of EX had the order O 3 /UV 185+254nm >O 3 /UV 254nm >UV 185+254nm >UV 254nm >sole O 3 . The EX removal by O 3 /UV 185+254nm reached 99.13 % within 15 min with the half-life of 2.29 min. The higher solution pH promoted the EX degradation for the O 3 /UV 185+254nm and sole O 3 . After 90 min, 1.72 % of total sulfur in EX had emitted into gas for the O 3 /UV 185+254nm , slightly higher than that (0.49 %) for sole O 3 . The solid phase extraction and gas chromatography‒mass spectrometry (SPE/GC–MS) and UV–vis spectroscopic analysis revealed that 13 organic byproducts were generated from EX collector and most of them could be further decomposed by O 3 /UV 185+254nm . Because the O 3 /UV 254nm and UV 185+254nm photolysis were included, the O 3 /UV 185+254nm was the most efficient process in the removal and mineralization of xanthate collectors among five processes.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
POLYMER
·
2019
·
IF 3.771
Ying Wang,Qiang Liu,Jinhui Li,Lei Ling,Guoping Zhang,Rong Sun,Ching-Ping Wong
Light-activated self-healing (LSH) materials have received extensive attentions recently due to their environmentally friendly repairing methods and excellent healing performance. However, the current reported LSH materials have poor mechanical strength and elasticity, which limit their applications. Herein, a novel series of coumarin-based polyurethanes with enhanced mechanical properties and elasticity have been synthesized which possessed a dramatic breaking stress of 27 MPa with a high breaking strain of 890%. Besides, the energy dissipation efficiency in continuous stretch cycles of the as-prepared polyurethanes varied negligibly, which proves the as-prepared LSHs have excellent elasticity. Meanwhile, after cutoff, the polymers exhibited excellent self-healing performance by UV irradiation for 40 min and the best healing efficiency of strain, stress and Young's modulus were 84%, 92%, 94%, respectively. The prepared self-healing polyurethanes showed great potential applications in the fields of smart materials such as self-healing coatings, electrochemical sensors and devices, electronic skin, etc.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 35
·期 1
·e6073
·
IF 3.14
Jianyu Dong,Xiuling Chen,Fangyan Ji,Lixin Liu,Lebin Su,Min Mo,Jian-Sheng Tang,Yongbo Zhou
A simple and direct aerobic oxidative esterification reaction of arylacetonitriles with alcohols/phenols is achieved in the presence of a copper salt and molecular oxygen, which produces a broad range of aryl carboxylic acid esters in good to high yields. Copper salt plays multiple roles in the transformation, which allows the oxygenation of C H bond, cleavage of inert C C bond, and formation of C O bond in one pot without the assistance of any of the acids, bases, ligands, and so on. The reaction provides a simple, direct, and efficient protocol towards functionalized esters, especially aryl benzoates, from readily available starting materials.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55915
·
IF 2.7
Tianyuan Liu,Weihao Wang,Tian Yin,Zhikui Jiang,Zhichao Zhen,Guochun Yan,Junhui Ji
The application and promotion of biodegradable plastics are hindered by the imbalance between their mechanical and degradation performance imbalance, as well as high costs. Herein, a series of poly(ethylene adipate-co-terephthalate) (PEAT) copolyesters with excellent mechanical and degradation properties are synthesized by one-step melt polycondensation. The influence of the proportion of aliphatic groups in the molecular chain on the structure and properties, especially the degradation performance, of the copolyesters was studied. The molecular chain flexibility and degradability of PEAT increases with increasing of adipic acid content and decreasing of ET fragment length ( L ET ). The comprehensive mechanical properties of PEAT60 can be comparable to traditional packaging material poly(butylene adipateco-terephthalate) (PBAT). The degradation performance of PEAT can be adjusted the molecular chain structure. PEAT with L ET < 3 exhibit degradation performance, and PEAT with L ET < 2.2 exhibit significant degradation acceleration. The excellent mechanical and degradable properties of PEAT copolyester make it expected to be used in degradable packaging and other fields to help solve plastic pollution, while its lower cost will aid in the promotion of degradable materials.
研究领域:
材料科学
·
高分子化学
·
环境科学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Lei Wang,Yanan Zhu,Jinqing Qu
A series of novel trimethylol propane monoesters were synthesized to prepare aqueous polyurethane dispersions (PUD), which were used as a polymer coalescent to assist the film forming of high T g polyacrylate latexes (PA). The effects of trimethylol propane monoester categories, NCO/OH molar ratios, soft segment contents, dimethylolpropionic acid (DMPA) contents, and diamine chain extenders on assistant-film-forming performance of PUD were investigated. The surface microstructures of PA/PUD blend latexes were also characterized with scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results showed that the PUD prepared from trimethylol propane monolaurare (TMPLA) with long-chain alkyl groups displayed excellent assistant-film-forming ability. The assistant-film-forming ability of PUD was increased with decreasing of NCO/OH molar ratios and hard segment proportions. The optimum preparation process of better assistant-film-forming PUD was that isophorone diisocyanate (IPDI), polyether 220 (N220), trimethylol propane monoester (TMPLA) and adipic acid dihydrazide (ADH) as reactants, 1.5 of the NCO/OH molar ratios, 55/45 of the soft/hard segment mass ratio and 5% of ω (DMPA). The high T g polyacrylate latexes with PUD could form a continuous transparent film at 5 °C with 30 g L −1 of the volatile organic compounds (VOC) contents and display good film performance.
研究领域:
高分子科学
·
材料工程
·
化学合成
·
涂料与薄膜
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Future Foods
·
2025
·Vol. 6
·期 1
·66-72
·
IF 7.2
Hao Zhang,Bin Wu,Yanping Xian,Ming Liang,Yunjian Ma,Yonghua Wang
Musk macrolides are a kind of rare flavors structurally featuring 14−16 membered rings in the flavour and fragrance industry. While various chemical synthesis routes for musk macrolides exist, there is a growing interest in biocatalytic approaches. In this study, a new biocatalytic approach is proposed for the synthesis of musk macrolides from fatty acids using unspecific peroxygenases (UPOs) in combination with lipase. Specifically, the UPO from Marasmius rotula ( Mro UPO) was utilized as an oxidation catalyst together with the choline oxidase from Arthrobacter nicotinate ( An ChOx) for the in situ generation of H 2 O 2 . The enzymatic cascade process involved the hydroxylation of fatty acids using Mro UPO as a catalyst to prepare terminal hydroxylated fatty acids. Under the optimized conditions, 14-hydroxy tetradecanoic acid, 15-hydroxy pentadecanoic acid and 16-hydroxy hexadecanoic acid were obtained at concentrations of 11.1, 18.2 and 17.1 mg/L in a 50-mL reaction system, respectively. These hydroxylated fatty acids were then separated and esterified by lipase Novozymes 435 to produce the desired macrolides. Various ω -hydroxy fatty acids were successfully converted into macrolides, with the concentrations of cyclotetradecanolide, cyclopentadecanolide and cyclohexadecanolide reaching 11, 29 and 23 mg/L, respectively, in a 10-mL reaction system. This new biocatalytic approach represents a promising method for synthesizing valuable natural flavour compounds.
研究领域:
生物催化
·
酶工程
·
天然产物化学
·
风味化学
·
分子生物学
·
绿色合成
✓ 已验证
DOI
高影响因子
Journal of Applied Spectroscopy
·
2022
·Vol. 89
·期 3
·559-566
·
IF 0.816
Gao Ch.,Du H.
Forsythoside E is one of the major secondary metabolites in Forsythia suspensa . The interactions between forsythoside E and two types of cholinesterases, acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) were investigated in PBS buffer (pH 7.40) by using multispectroscopic techniques. Forsythoside E increased the fluorescence intensity of AChE but quenched the fluorescence of BChE. Synchronous fluorescence studies showed that forsythoside E mainly acts on tyrosine residues of AChE and tryptophan residues of BChE. It was also proved that the complex between the compound and cholinesterases formed spontaneously at a stoichiometric ratio of 1:1 via multispectral technology. Finally, forsythoside E inhibited the activities of cholinesterases with similar IC 50 values of 1.08 mM for AChE and 0.92 mM for BChE. The results illuminate the details of the interaction between forsythoside E and cholinesterases.
研究领域:
药理学
·
生物化学
·
分子生物学
✓ 已验证
DOI
高影响因子
Journal of Industrial Textiles
·
2025
·
IF 2
Hongyan Wu,Wenna Xing,Chuyan Zheng,Liuyao Wang,Jialu Li
The safety of blood transfusions faces significant challenges due to the presence of leukocytes, which can trigger severe immune responses and facilitate virus transmission. Existing leukocyte reduction filters, predominantly composed of melt-blown nonwovens, encounter difficulties in completely eliminating leukocytes for specific patient populations such as organ transplant recipients. This research introduces electrospun membranes composed of PBS and CS/PBS nanofiber membranes as a novel filtration material. Through the optimization of electrospinning parameters (including voltage, receiving distance, and solution volume), membranes with adjustable pore sizes ranging from 1.3 to 2.1 μm and substantial specific surface areas were developed. Blood filtration trials revealed that nanofiber membranes with an optimal pore size range of 1.9–2.1 μm achieved complete leukocyte removal while preserving a red blood cell (RBC) recovery rate of 87.72%–90.65%. In comparison to conventional filters, these electrospun nanofiber membranes present a promising strategy for highly efficient leukocyte depletion, catering to the demands of critical transfusion scenarios.
研究领域:
生物医学工程
·
纳米技术
·
输血医学
·
材料科学
·
免疫学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 302
·期 1
·43-56
·
IF 2.4
Yu Jinshuo,Zhao Tao,Li Chentao,Pan Hongwei,Tan Zhiyong,Yang Huili,Zhang Huiliang
In this work, polylactic acid/poly (butylene adipate-co-terephthalate) (PLA/PBAT) melt-blown nonwovens with well oil-water separation properties were processed with melt-blown technology. The effects of different contents of PBAT (0, 2, 4, 6, 8, and 10 wt%) on the thermal, crystalline, morphology, mechanical properties, wettability, and oil-water separation performance of the PLA/PBAT melt-blown nonwovens were thoroughly investigated. The result of differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) shows that PBAT promotes the movement of the PLA molecular chain and promotes crystallinity. With increasing the blending ratio of PBAT, the degree of crystallinity ( X c ) of PLA was also enhanced from 1.5 to 15.5%, respectively, which was higher than neat PLA. Furthermore, PBAT increases the toughness and hydrophobia of the PLA melt-blown nonwovens. The elongation at break of PLA/PBAT 90/10 (53.3 ± 3.7%) melt-blown nonwovens was 12.3% higher than the neat PLA (41.0 ± 2.9%). The result of the research on the influence of the oil-water separation parameters and oil absorption experiments shows that the 90/10 PLA/PBAT melt-blown nonwoven exhibits the highest hydrophobic (water contact angle is 133.2°). Meanwhile, the oil-water separation efficiency is 96%. The PLA/PBAT melt-blown nonwovens have excellent oil-water separation capability.
研究领域:
材料科学
·
化学工程
·
环境科学
·
高分子科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）