JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Ziming Lun,Lina Song,Yi Luo,Jiaoyan Ai,Tulian Zhong,Wenqi Xian,Baohua Liu
A series of nonhalogen UV-curable polyurethane acrylates (PUA) were synthesized using polyethylene carbonate diol (PECD), isophorone diisocyanate, hydroxyethyl acrylate, a reactive phosphorus-containing acrylate, and pentaerythritol triacrylate. The flame retardancy, mechanical properties, hardness, abrasion resistance, and solvent absorption of the PECD-based UV-cured polyurethane were systematically studied and compared to polyester and polyether-based analogues. Infrared spectroscopy confirmed successful PECD-PUA synthesis. Results demonstrate the PECD confers superior flame retardancy compared to conventional petroleum-based materials, achieving a limiting oxygen index of 28.2% and UL-94 5VB rating, alongside excellent comprehensive performance: tensile strength of 15.56 MPa, pencil hardness of 6H, abrasion loss of 0.52%, and strong adhesion (Grade 3). This work presents a green strategy for synthesizing high-performance, environmentally friendly polyurethanes, reducing reliance on petroleum resources. Graphical This study successfully synthesized halogen-free UV cured CO 2 -polyurethane acrylate (PUA) using PECD, IPDI, HEA, and phosphorus containing acrylate, and compared it with polyester and polyether polyurethane acrylate. Fourier-transform infrared (FTIR) spectroscopy confirmed the successful synthesis of PECD-PUA. Results demonstrate that PECD-based polyurethane exhibits exceptional flame retardancy, thermal stability, mechanical performance, and coating properties. In summary, PECD-based halogen-free UV-curable flame-retardant polyurethane demonstrates outstanding multifunctional properties, positioning it as a promising candidate for eco-friendly, high-performance polymer.
研究领域:
高分子科学
·
材料工程
·
阻燃技术
·
绿色化学
·
紫外光固化技术
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 30
·e52694
·
IF 3.057
Liang Chen,Zhuding Dai,Wenxue Lou,Pingping Jiang,Pingbo Zhang,Yanmin Bao,Xuewen Gao,Jialiang Xia
In order to endow water-based polyurethane with special functionality, vegetable oil-based waterborne polyurethane with self-healing properties is synthesized. Firstly, soybean oil-based emulsifier (GA-ESO) was prepared by epoxy soybean oil and glutaric acid without solvent and catalyst. Then, two Diels−Alder (DA) diols were prepared by the DA reaction between N , N ′-(4,4′-methyldiphenyl) bismaleimide, 4-maleimide phenol and furfuryl alcohol, respectively. Finally, GA-ESO and DA diols used as the raw material was reacted with isophorone diisocyanate to synthesize a series of soybean oil-based waterborne polyurethane with self-healing behavior. The effects of DA diol on the properties of polyurethane films and the self-healing process and mechanism of polyurethane membrane were investigated. The results showed that after the addition of DA diol, the particle size of polyurethane emulsion increased from 28.8 to 85.3 nm, the tensile strength was improved from 0.3 to 12.6 MPa, and the water contact angle was enhanced from 68.5° to 84.2°. In addition, it can be observed that with the addition of DAdiol, the polyurethane film had self-healing behavior at high temperature, and the highest self-healing efficiency can reach 100%.
研究领域:
材料科学
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高分子化学
·
化工
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Yao Yan,Zuanxin Yang,Songming Chen,Rong Yang
The flame-retardant modification of polymers, while preserving or enhancing their mechanical properties, is critical for engineering plastics. In this study, we develop flame-retardant polycarbonate (PC) composites with improved mechanical performance by incorporating cinnamate-containing liquid crystalline copolyester (CLCP). During the injection molding process, CLCP forms oriented microfibrils in situ, boosting the tensile strength of the composites by up to 66 %. The cinnamate groups in CLCP undergo radical-initiated thermal crosslinking, which increases melt viscosity, prevents dripping, and achieves a UL-94 V-0 rating. The primary flame retardancy mechanism occurs in the condensed phase: early decomposition of CLCP triggers thermal crosslinking, leading to the formation of a dense, graphitized char layer that reduces the peak heat release rate (PHRR) by 46.8 %, total smoke production by 17.9 %, and increases the limiting oxygen index (LOI) to 32.5 % (compared to 27.0 % for neat PC). This dual-functionality of CLCP addresses both the flammability and mechanical limitations of PC, making it a promising candidate for engineering applications requiring high-performance materials. This work introduces a novel molecular design strategy, integrating liquid crystallinity and cinnamate crosslinking, to enhance both flame resistance and mechanical properties in engineering plastics.
研究领域:
材料科学
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高分子工程
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消防安全工程
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2024
·Vol. 24
·期 7
·2713-2723
·
IF 2.8
Hua Li,Dang Fanglin,Yu Lumengfei,Zhao Hui,Wei Ting,An Fengqiu
Purpose This study aimed to investigate the residual levels of representative organophosphorus and pyrethroid pesticides (chlorpyrifos, cypermethrin, deltamethrin, and lambda-cyhalothrin) in agricultural soils and crops in Shaanxi Province, and to reveal their accumulation characteristics and regional distribution characteristics in crops. Materials and methods The study was conducted using 115 soils and crops samples from typical agricultural areas in Shaanxi Province. The pesticide residues were measured using gas chromatography-mass spectrometry (GC-MS). The crops were analyzed based on the residue characteristics of fruits, vegetables, and field crops. Additionally, the pesticide residues in crops from the Guanzhong area (central part of Shaanxi), northern Shaanxi, and southern Shaanxi regions were analyzed. A correlation analysis was conducted to examine the influencing factors of pesticide residues in soil-crops, considering the physical and chemical properties of the soil in Shaanxi Province. Results and discussion The results indicate that there are differences in the detection rates and residual concentrations of different pesticides in soil. In the Guanzhong area, the pesticide residual levels in crops follow the trend of chlorpyrifos > deltamethrin > lambda-cyhalothrin > cypermethrin, with relatively high pesticide residues found in corn. In northern Shaanxi, the overall pesticide residual levels in crops show a trend of chlorpyrifos > deltamethrin > cypermethrin > lambda-cyhalothrin. In southern Shaanxi, all the pesticides were detected to varying degrees in crops, with chlorpyrifos showing the highest residual levels. Conclusions All four pesticides were detected in the soils of the study area and the enrichment capacity of different crops varied greatly. Pesticide enrichment is not only affected by temperature and climate conditions in different regions, but soil organic matter, pH, and CEC also have a significant effect on the enrichment of pesticides by crops.
研究领域:
环境科学
·
农业科学
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产品关联
DOI
高影响因子
Food Chemistry-X
·
2025
·
IF 8.2
Shi-Yi Wang,Chen Li,Yu-Jie Li,Guang-Qian Liu,Zhen-Ming Lu,Li-Juan Chai,Hong-Yu Xu,Jin-Song Shi,Song-Tao Wang,Cai-Hong Shen,Xiao-Juan Zhang,Zheng-Hong Xu
Soy sauce aroma type Baijiu (SSAB) is a complex blend of seven rounds of raw SSAB, each with distinct aroma profiles that evolve during maturation. Tracking the aging of individual rounds is crucial for understanding flavor development. The round 1–4 SSABs were analyzed by gas chromatography–mass spectrometry and an electronic tongue over one-year aging. Results showed that short/medium-chain esters decrease while long-chain esters, acids, aldehydes, pyrazines, ketones, and furans increase. Kinetic analysis showed that short/medium-chain ethyl esters reach equilibrium in the esterification-hydrolysis reactions, whereas long-chain ethyl esters favor esterification, with their reaction quotient (Qc) diverging from the equilibrium point. Linoleic acid ethyl ester, identified as a key aging marker, was found to reduce the volatilization rate of critical aroma compounds in the finished glass, thereby prolonged the duration of lingering aromas. These findings provide a foundation for improving SSAB blending and storage, highlighting aging's key role in enhancing Baijiu quality.
研究领域:
食品科学
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发酵工程
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分析化学
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产品关联
DOI
PubMed
高影响因子
POLYMER SCIENCE SERIES B
·
2021
·Vol. 63
·期 4
·358-366
·
IF 1.049
Danbo Mao,Yuechuan Wang
Abstract Four 2,5-dicholorobenzoate monomers were prepared by chlorination and esterification and then polymerized to ester substituted poly( p -phenylene)s through Ni/Zn catalyzed coupling reaction. The thermal stability and pyrolysis behavior of ester substituted poly( p -phenylene)s were investigated through TGA method. The possible mechanism of thermal modification of the polymers was proposed that included de-esterification, dehydration and decarboxylation, and finally de-anhydridization. Only pyrolysis of esters substituted poly( p -phenylene)s containing two neighboring carboxyl groups may result in the formation of the corresponding anhydride.
研究领域:
高分子化学
·
材料科学
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DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 12
·3584-3597
·
IF 2.482
Xu Chao,Gan Jiacheng,Mei Xingyu,Zhou Yousheng,Duanmu Jiahui,Zhu Guangqi,Zhang Haijiang,Han Xiaoxiang,Wang Yanbo,Liu Shang-Bin
Abstract A series of highly active silver ion-exchanged silicotungstic acid (H 4 SiW 12 O 40 ; STA) catalysts, Ag x H 4− x SiW 12 O 40 ( x = 1–4), were successfully synthesized and applied for the production of glycerol monolaurate (GML) via esterification of lauric acid (LA) with glycerol (GL). The physicochemical properties of these Ag-promoted STA were characterized by TGA, FE-SEM, XRD, and FT-IR, and their acidic properties were studied by a solid-state 31 P NMR probe molecule method using trimethylphosphine oxide (TMPO) as the probe. Among various catalysts, the Ag 2 H 2 SiW 12 O 40 catalyst showed extraordinary activity owing to the strong Brønsted acidity, Brønsted–Lewis acid synergy, as well as the unique Keggin structure possessed by the catalyst. A Box–Behnken design (BBD) based on response surface methodology (RSM) was exploited for the optimization of process variables. A maximum GML yield of 80.2% was achieved for the Ag 2 H 2 SiW 12 O 40 catalyst under a GL/LA molar ratio of 4.4, catalyst amount of 4.6 wt%, reaction temperature of 429 K, and reaction time of 153 min, which was in conformity with those predicted by the mathematical model. Further recyclability and kinetic studies confirmed that the Ag 2 H 2 SiW 12 O 40 catalyst was reusable, robust, and highly efficient for the synthesis of GML with an activation energy ( E a ) of 38.14 kJ/mol. Graphic Abstract Due to the strong acidity and synergy of B/L acid sites, Ag ion-exchanged silicotungstic acid catalysts show superior activity and durability for the synthesis of glycerol monolaurate.
研究领域:
化学工程
·
催化材料科学
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DOI
高影响因子
POLYMER BULLETIN
·
2011
·Vol. 68
·期 4
·1009-1022
·
IF 1.215
Han Wensong,Lin Baoping,Yang Hong,Zhang Xueqin
Using step by step polymerization process, the first- and second-generation hyperbranched polyesters were synthesized with N , N -diethylol-3-amine methylpropionate as branched monomer and pentaerythrite as a core molecule. The second-generation hyperbranched polyurethane acrylate oligomers containing carboxyl groups were obtained by further reacting with semiadduct urethane monoacrylate and maleic anhydride. The structures of the oligomers were investigated with elemental analysis, FT–IR, and NMR. UV–Vis spectra results showed that the oligomers had sharp absorption bands at about 207 nm. The glass transition temperatures were investigated by differential scanning calorimetry and showed in the range of −44.96 to −19.83 °C. Gel permeation chromatograph was used to observe the molecular weights and polydispersities of the oligomers. UV-curing properties were characterized by FT–IR with different curing time. In addition, the solubilities and viscosity of the oligomers were also examined.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
·
2019
·Vol. 52
·期 1
·69-74
·
IF 0.627
Miao Xue,Mei-Hua Zhu,Cai-Jun Zhong,Yu-Qin Li,Na Hu,Izumi Kumakiri,Xiang Shu Chen,Hidetoshi Kita
A high performance ZSM-5 zeolite membrane is applied to remove H2O from the esterification of acetic acid and isopentanol by pervaporation. The influences of reaction conditions on the isoamyl acetate yield are studied in detail. Compared with the traditional esterification of acetic acid and isopentanol, the esterification with “membrane extractor” has a well isoamyl acetate yield at low reaction temperature. With the reaction temperature, acetic acid/isopentanol molar ratio and effective membrane surface area to esterification mixture ratio volume of 100°C, 3.0/1.0, 2.0 wt% NaHSO4, and 0.26 cm2/cm3, respectively, the isoamyl acetate yields was 98.39%, the membrane flux and separation factor (H2O to organic) were 0.21 kg·m−2·h−1 and 1040, respectively. Further, the ZSM-5 zeolite membrane shows good long–term stability and reproducibility for the pervaporation-esterification, the isoamyl acetate yields of the esterification-pervaporation for intermittent 8 times or continuous 160 h still remained at 97.73% and 98.30%, respectively. In addition, the ZSM-5 zeolite membrane still retained the typical MFI diffraction peaks and morphology by XRD and SEM characterization after long-term PV–esterification .
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2020
·Vol. 40
·期 5
·409-414
·
IF 1.126
Tian-Xiang Jin,Miao-miao Wu,Jin-bo Ou-yang,Qin Zhang
Poly (butylene succinate-co-butylene-3-hydroxyphenylphosphinyl-propionate) (PBSH) was synthesized through polycondensation. Then, 4,4′-methylene diphenyl diisocyanate (MDI) was introduced into PBSH matrix by reactive blending. The chemical structure and properties of the blending products were investigated using Fourier Transform Infrared Spectroscopy (FT-IR), differential scanning calorimetry (DSC), limiting oxygen index (LOI) tests, thermogravimetric analysis (TGA), and vertical burning tests. The results proved that MDI can improve the mechanical properties and flame retardancy of PBSH. In addition, it was found that the crosslinking structure can reduce the hydrolysis rate of PBSH and effectively eliminate the melt-dripping of PBSH during combustion.
研究领域:
高分子化学
·
材料科学
·
燃烧学
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DOI
高影响因子
Chemistry Africa-A Journal of the Tunisian Chemical Society
·
2021
·Vol. 5
·期 1
·79-87
·
IF 0
Naz Farah,Ciprian Matteo,Luo Zhixiong,Yan Shilin,Iqbal Shahzad Zafar,Zhu Meifang,Chaemchuen Somboon,Verpoort Francis
The synthesis and use of MOF-derived Co/NCF (N-doped carbon framework) material as a heterogeneous catalyst for copolymers synthesis via ring-opening polymerization (ROP) are reported for the first time. The Co/NCF material is applied for the copolymerization of L -lactides (LA) and ε-caprolactone (ε-CL) as monomers via ROP in bulk without any solvent or co-catalyst. The as-prepared catalyst is characterized using XRD, TPD, XPS, SEM, and TEM analytical techniques. At the same time, 1 H and 13 C-NMR spectroscopy were used to analyze the microstructure of the copolymer confirming the random copolymer structure. The average r values calculated from the heterodiad analysis of the 1 H NMR, data were r LA = 0.96 and r CL = 0.93 and L value calculated from the triads analysis of 13 C NMR, data were L LA = 3.17 and L CL = 2.79, respectively. It has been observed that the melting temperature and glass transition temperature of the copolymer increases with higher LA content. The XRD and DSC analyses also confirmed that the as-synthesized copolymer possesses two phases corresponding to the polylactide and polycaprolactone, respectively. Additionally, the activity of Co/NCF is also compared with other Co-based heterogeneous catalysts to demonstrate its ability. Graphic Abstract
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
Molecular Catalysis
·
2020
·
IF 3.687
Na Ji,Zhenyu Liu,Xinyong Diao,Jinrong Bao,Zhihao Yu,Chunfeng Song,Qingling Liu,Degang Ma,Xuebin Lu
GVL (γ-valerolactone) is identified as an important biomass platform molecule due to its wide application. In this work, a series of novel supported Ni catalysts with different supports and Ni loading were synthesized via metal-organic chemical vapor deposition (MOCVD) method for the hydrogenation of EL (ethyl levulinate) to GVL. Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), nitrogen adsorption/desorption, inductively coupled plasma optical emission spectroscopy (ICP-OES) and transmission electron microscopy (TEM) were used to characterize the as-synthesized catalysts. The results showed that the 2 wt.% Ni/AC(MOCVD) presented superior catalytic activity when compared with the catalyst prepared by impregnation method. This behavior is explained in terms of the smaller Ni nanoparticles (4.28 nm) and higher dispersion on 2 wt.% Ni/AC(MOCVD). Among the catalysts, the 2 wt.% Ni/AC catalyst exhibited the best catalytic performance with 99.7 % EL conversion and 79.8 % GVL yield under 1 MPa initial H 2 pressure (measured at room temperature) at 250 °C for 2 h. In addition, the reaction conditions were optimized and the stability of the catalyst were also investigated. The insights gained from this study in the design of high dispersed Ni particles with smaller particle size via MOCVD method will facilitate the metal-catalyzed hydrogenation of EL to GVL.
研究领域:
化学工程
·
生物质能源
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）