E-POLYMERS
·
2021
·Vol. 21
·期 1
·336-345
·
IF 2.025
Wen-Bo Neng,Wen-Guang Xie,Bo Lu,Zhi-Chao Zhen,Jun-Long Zhao,Ge-Xia Wang,Jun-Hui Ji
A series of novel biodegradable copolyesters named poly(butylene 3-methyl adipate co -terephthalate) (PBA m T) were synthesized from the monomers of 3-methyl adipic acid (AA m ), 1,4-butanediol (BDO), and terephthalic acid (TPA) through a process of esterification and polycondensation. 1 H NMR analysis shows that they are random copolymers whose composition can be well controlled by the feed ratio of monomers. From the results of DSC and XRD, the introduction of methyl group successfully destroys the crystallizability of the PBA m chains, thus making it become a relative soft segment compared to PBA, while these random PBA m T copolymers constructed by soft segment PBA m and rigid segment PBT change from semi-crystalline polymers to nearly amorphous polymers as the feed ratio of A m increases. Especially, mechanical tests reveal that the copolymers show outstanding elasticity and rebound resilience with excellent strength. These thermoplastic copolyester elastomers with good performance by simply introduction of branched methyl group on polybutylene adipate terephthalate (PBAT) copolymer chains may well explore the potential application of biodegradable PBAT-based material.
Graphical abstract
Methyl branched PBA m T possesses excellent elasticity and shows certain degradation performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2017
·
IF 7.182
Yi-Tong Wang,Zhen Fang,Xing-Xia Yang
Biodiesel production was catalyzed by a novel magnetic carbonaceous acid (Zr-CMC-SO 3 H@3Fe-C 400 ) with both Brønsted and Lewis sites synthesized by a four-step method: (i) metal (Fe) ion chelation, (ii) calcination, (iii) metal (Zr) ion chelation and embedding, and (iv) sulfonation. It catalyzed the esterification of oleic acid with 97% biodiesel yield, transesterification of high acid value (AV) soybean oil with 95% biodiesel yield, and pretreatment of Jatropha oil with AV reduced from 17.2 to 0.7 mg KOH/g. Biodiesel yields (>90%) at 90 °C for 4 h reaction time were obtained for ten cycles by easy magnetic separation which showed potential practical applications in the field of green production. The synthesized catalyst was characterized with elemental analysis, XRD, ICP-OES, FT-IR, BET, VSM, SEM-EDX, HRTEM, TG-DSC and Boehm titration.
研究领域:
化学工程
·
可再生能源
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Haoyu Wang,Jinghui Wang,Mei Cui,Rongxin Su,Renliang Huang
The oil-absorbent sponge is effective in the prevention and cleanup of offshore oil spills. However, biofouling in marine environments will significantly reduce its oil absorption capacity. Herein, a novel type of antifouling and superhydrophobic polyurethane (PU) sponge was successfully prepared via grafting Econea (antifouling agent) to diisocyanate monomer and hydrophobic modification of PDMS (Polydimethylsiloxane) and SiO 2 . The prepared PDMS-SiO 2 @PU-Econea sponge shows not only super-hydrophobicity with a WCA of 154.5° but also excellent antifouling properties with more than 99% of inhibition to Escherichia coli after immersed in artificial seawater (salinity ≈35‰) for 50 days. It can absorb 133.9 times of trichloromethane than its own weight and still maintain 98.5% of absorption after 50 cycles. In addition, the PDMS-SiO 2 @PU-Econea sponge exhibits excellent continuous oil–water separation performance. The separation fluxes of n-hexane and dichloromethane are 151.0 and 136.3 L·h −1 ·g −1 , respectively, and the oil–water separation efficiency is up to 99.9%, it can absorb 50 times of crude oil than its own weight in 75 s. Therefore, the antifouling and superhydrophobic PDMS-SiO 2 @PU-Econea sponge is a promising and applicable oil absorbent sponge for long-term oil/water separation and cleanup of oil spills in marine environment.
研究领域:
材料科学
·
环境科学
·
海洋学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Zihao Wu,Jian Wang,Jiaxin Liu,Jinhua Lei,Heran Nie,Qiliang Yuan,Zhipeng Wang,Liang Li
Aromatic polyesters are an attractive class of engineering thermoplastics with excellent chemical properties, thermal stability and environmental stability, as well as good optical properties, but they have rarely been reported. Refractive index (RI) is one of the properties commonly used to compare the optical properties of materials. The higher the refractive index, the thinner the lens made of the corresponding material; however, the preparation of high-refractive-index polymers is currently a thorny issue, in which the structure of the polymer molecules has a great impact on their refractive index, to design high-refractive-index materials requires starting from the structure of the molecules. Phenolphthalein has a unique structure with a molecular skeleton consisting of three benzene rings and a cyclic lactone that exhibits a twisted non-coplanar structure. This cyclic side group can hinder the accumulation between the polymer molecular chains, not only improving the solubility of the polymer molecules, but also increasing the transparency of the polymer films. In this work, we used phenolphthalein (PHT) and its derivatives to polymerize with terephthaloyl chloride (TPC), respectively, through the structural differences between them, the influence of polymer structure on the refractive index and thermal properties was discussed. Among them, polyester PAR-NPHT had the highest refractive index (nd>1.67), and is expected to be a new generation of optical materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2023
·Vol. 154
·期 10
·1189-1195
·
IF 1.8
Wang Peng,Shi Huibing,Feng Baolin,Zhao Deming,Wu Haigang
The Ru-catalyzed highly selective alkoxycarbonylation of allenes with aliphatic alcohols (also as solvent) allow to produce useful α , β -unsaturated esters in good to excellent yields at 70 °C. Efficient regioselectivity could be controlled in the presence of N-ligands while the P-ligands had no influence on the conversion of substrates and the chemo/regioselectivity of target products. By involving N-ligand 4,7-dimethyl-1,10-phenanthroline in the catalytic system, α , β -unsaturated esters were obtained with high conversion and chemo/regioselectivity (conversion up to 99%, chemical selectivity up to 99%, regioselectivity of branched ester/linear ester up to 89/11). Graphical abstract
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2024
·
IF 2.1
Jiahong Chen,Mengke Wang,Weichun Huang,You Zi
A mild and convenient method for synthesizing thioesters has been developed, from sulfenylchlorides and carboxylic acids via a phosphine mediated umpolung process. This approach efficiently produces a broad spectrum of thioesters from readily available carboxylic acids, including primary, secondary, and tertiary types, as well as bioactive molecules. The successful gram-scale reactions also validate its scalability and practical application.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
E-POLYMERS
·
2022
·Vol. 22
·期 1
·544-552
·
IF 3.074
Sheng Ding,Jinxing Zhu,Saiqi Tian
Polyurethane-based retanning agents with antimicrobial properties were synthesized by the chemical incorporation of ciprofloxacin (CPFX) units into polyurethane chains. The chemical structures were characterized by Fourier transform infrared (FTIR) and gel permeation chromatography (GPC). Then, the retanning agents were applied in the leather retanning process. Owing to the conjugation of CPFX into polyurethane chains, the molecular weight increases, further leading to the decrease in hydroxyl value and increase in particle size. The shrinkage temperature was improved after retanning. Owing to the filling of retanning agents in the gap of collagen fibers, the average thickness of leather increased by 65.8%. The mechanical properties of leather were visibly improved because of the large number of –COOH coordinate with Cr 3+ and more hydrogen crosslinking with carboxyl group, amino group, and hydroxyl group of leather collagen. Furthermore, leather retanned by these polyurethane-based retanning agents presented good antimicrobial properties. The antibacterial activity could be conserved above 89% even after rinsing for ten times.
研究领域:
化学工程
·
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 13
·e202200253
·
IF 5.497
Mingsheng Luo,Tong Qin,Qinglong Liu,Zhi Yang,Fengli Wang,Hong Li
Graphical Promoting : A series of Fe-modified CeO 2 catalysts with nanoparticle, nanorod, nanocube and nano-octahedron morphologies were synthesized by the hydrothermal method. The Fe-modified CeO 2 nanorod catalysts exhibit a remarkably promoting effect on the formation of DMC from CO 2 and methanol. A series of Fe-modified CeO 2 catalysts with nanoparticle, nanorod, nanocube and nano-octahedron morphologies were synthesized and applied for direct synthesis of dimethyl carbonate (DMC) from CO 2 and methanol. The Fe-modification shows a remarkably promoting effect on the formation of DMC over Fe-modified CeO 2 nanorod. The DMC yield was improved from 0.202 to 2.568 mmol DMC per g cat by 2 %Fe-modification of CeO 2 nanorod. A synergistic effect among the moderate acid-basic sites, specific surface area and surface composition resulted from Fe-modification was proposed to be crucial to obtaining the high reactivity of DMC formation.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Zhixian Huang,Haiming Jiang,Ling Li,Hongxing Wang,Ting Qiu
The properties of ethyl trifluoroacetate (CF 3 COOCH 2 CH 3 ) were measured as a function of temperature: density (278.08 to 322.50) K, viscosity (293.45 to 334.32) K, saturated vapor pressure (293.35 to 335.65) K. The density data were fitted to a quadratic polynomial equation, and the viscosity data were regressed to the Andrade equation. The correlation coefficient ( R 2 ) of equations for density and viscosity are 0.9997 and 0.9999, respectively. The correlation between saturated vapor pressures and temperatures was achieved with a maximum absolute relative deviation of 0.142%. In addition, the molar evaporation enthalpy in the range of T = (293.35 to 335.65) K was estimated by the Clausius–Clapeyron equation.
研究领域:
化学
·
热力学
✓ 已验证
DOI
高影响因子
ACS Synthetic Biology
·
2022
·
IF 5.249
Jiawei Li,Mario Roque Huanca Nina,Xiaoyan Zhang,Yunpeng Bai
Poly(ethylene terephthalate) (PET) and phthalate esters (PAEs) are used extensively as plastics and plasticizers. Enzymatic degradation of PET and PAEs has drawn great attention in recent years; however, evolution of PET- and PAE-degrading enzymes is still a big challenge, partly because of the lack of an effective screening method to detect phthalic acid (PA) and terephthalic acid (TPA), which are the main hydrolysis products of PAEs and PET. Here, by directed evolution of a promiscuous transcription factor, XylS from Pseudomonas putida, we created two novel variants, XylS-K38R-L224Q and XylS-W88C-L224Q, that are able to bind PA and TPA and activate the downstream expression of a fluorescent reporter protein. Based on these elements, whole-cell biosensors were constructed, which enabled the fluorimetric detection of as little as 10 μM PA or TPA. A PAE hydrolase, GoEst15, was preliminarily engineered using this new biosensor, yielding a mutant GoEst15-V3 whose activity toward dibutyl phthalate (DBP) and p-nitrophenyl butyrate was enhanced 2.0- and 2.5-fold, respectively. It was shown that 96.5% DBP (5 mM) was degraded by GoEst15-V3 in 60 min, while the wild-type enzyme degraded only 55% DBP. This study provides an effective screening tool for directed evolution of PAE-/PET-degrading enzymes.
研究领域:
生物技术
·
环境工程
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2025
·
IF 5
Yani Chen,Haiyu Qiao,Ning Jiang,Yayun Liu,Fanshuo Jia,Chuanyang Wang
High-quality plastic joining techniques using welding are urgently required in many engineering areas. Controlling morphology formation in joints plays an important role in the final quality, but relatively controlling methods are still challenging. In this paper, we propose an in-situ formed mechanical riveting structure between polycarbonate (PC) and polybutylene terephthalate reinforced with 10 % glass fiber (PBT/GF), which is induced by dual-wavelength through a home-made setup. First, the spectral properties of PC and PBT/GF are investigated to analyze optical differences at wavelengths of 980 nm and 1710 nm. Morphological characterizations reveal a significant number of glass fibers migrated across the interface and reached the PC side, forming a robust mechanical structure. These migrated glass fibers, serving as a mechanical rivet, could increase the tensile performance of the joints along with interfacial fusion bonding. Furthermore, the simulated temperature field indicates that employing a 980 nm laser effectively increases the welding temperature while preventing the thermal decomposition of the materials. The tensile test results show that the maximum tensile force using the 1710-PC//980-PBT/GF welding method, reaching 29.80 %, 20.40 %, and 111.3 % higher than that of 980-PC, 1710-PC, and 980-PC//1710-PBT/GF joints. And the corresponding displacement achieves 2.0-fold, 1.5-fold, and 4.0-fold increases compared to the above control groups. The fracture surface of the substrate and interfacial failure validate that the improved mechanical performance of joints could be attributed to the formation of a mechanical riveting structure. This paper verifies that dual laser beams could properly regulate the welding temperature field, control the morphology, and enhance the joint’s final performance.
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON
·
2024
·
IF 2.1
Zixu Li,Fei Wang,Kai Ma,Chao Fang,Qiang Jia,Changhu Chu
Aryl triflate is a type of facile and readily available compounds, which could be used as an alternative substrate for Suzuki cross coupling. In this manuscript, a novel ppm-Pd-Fe/C catalyst has been developed by reduction of palladium acetate and iron trichloride with aqueous hydrazine in situ and supported on activated charcoal. In combined with Sphos, and metal zinc as additives, this catalyst, with 300 ppm palladium loading, could be applied in the Suzuki cross coupling between aryl triflates with aryl neopentylglycolboronates.
研究领域:
有机化学
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）