ADVANCED MATERIALS
·
2011
·Vol. 23
·期 39
·4554-4558
·
IF 10.88
Qiang Peng,Xiangju Liu,Dan Su,Guanwen Fu,Jun Xu,Liming Dai
Graphical Low bandgap copolymers are prepared by incorporating thiophene-modified benzo[1,2- b :4,5- b ′]dithiophene and alkyloxy or fluorine-modified benzothiadiazole as donor and acceptor units. These copolymers exhibit a high open-circuit voltage and short-circuit current density. Good power conversion efficiencies are demonstrated in solar cell studies, indicating their promising photovoltaic application as donor materials.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 60
·期 5
·774-784
·
IF 0
Qing Li,Jie Hao Qu,Zi Zhao Qian,Hao Ran Sun,Lu Jie Wang,Fei Ya Fu,Xiang Dong Liu
Most of polybenzoxazines suffer from intrinsic processability problems, while application of the conceptual strategy of reactive diluent remains challenge in benzoxazine field. Here, we reported a new methodology employing a mixture of styrene (St) and glycidyl methacrylate (GMA) as a reactive diluent to dissolve benzoxazine. A commercially available benzoxazine, bis(4-(3,4-dihydro-2 H -1,3-benzoxazine-3-yl))phenylmethane (PH-ddm), was used as a model benzoxazine monomer for a variety of evaluation tests. GMA and St are capable of passing a robust radical polymerization to form linear copolymers, while offer epoxy groups to crosslink the PH-ddm polymer resulting from the ring opening polymerization. Moreover, the benzoxazine mixture solutions show advantages in preparing composites with glass fibers. By comparing to bulk benzoxazine, the mixture solutions allow significant improvement in terms of tensile strength and elongation of the composites. The main contributor for the enhanced properties is their low-viscosity nature and the capability to increase crosslinking density of the cured resin. The methodology presented here shows great potential for improving processability of benzoxazines, particularly in large-scale manufacturing of composite. Graphical
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
Science of Advanced Materials
·
2018
·Vol. 10
·期 12
·1729-1736
·
IF 1.318
Fan Youhua,Wu Zhenming,Sun Tiantian,Zhan Haijuan,Liu Wanyi,Bi Shuxian
Horseradish peroxidase (HRP) was successfully immobilized on a novel enzyme carrier, hydride composite of graphene oxide grafted sodium styrene sulfonate (GO-g-PSStNa), and used for removal of phenol from water. Hydride composite (GO-g-PSStNa) was synthesized using graphene
oxide (GO) and sodium styrene sulfonate (SStNa) by atom transfer radical polymerization (ATRP). The morphologies and chemical composition of the resulted samples were investigated by SEM, FTIR and XPS. The results showed that the hydrophilic monomer SStNa was grafted onto the surface of the
GO. HRP was immobilized on the surface of hydride material and its loading reached 8.0 mg/g under the immobilization conditions of pH 7 at 0 °C. The removal efficiency of phenol for immobilized HRP had an optimum pH 6, which was shifted to 8 for free enzyme. Both the free and immobilized
enzyme shared the same optimal temperature at 40 °C. Immobilized HRP exhibited higher removal efficiency for phenol compared with free HRP. The best immobilization effect could be reused at least eight times. The high phenol removal can be resulted by improvement of catalytic activity
of immobilized HPR with adsorption on GO-g-PSStNa support.
研究领域:
生物化学
·
环境科学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 28
·期 1
·74-81
·
IF 1.758
Wang Yuting,You Sijia,Hu Jie,Zhang Kan
Two 3-methytetrahydrophtalimide-functional benzoxazine monomers containing nitrile group have been prepared in order to achieve the basic design rules for developing high-performance thermosets via multifunctional benzoxazines. The chemical structures of the two new synthesized benzoxazine monomers have been confirmed by 1 H NMR, 13 C NMR and FT-IR. Besides, the polymerization behavior has been studied by using DSC and in situ FT-IR. In addition, the thermal stability and flame retardant properties of the resulting polybenzoxazines have also been investigated using TGA and MCC. The polybenzoxazine based on ortho -3-methytetrahydrophtalimide functional benzoxazine containing ortho -nitrile group exhibits excellent thermal stability and low flammability, with a T d 10 of 378 °C and a HRC value of 180 J/(g K).
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2016
·Vol. 13
·期 9
·925
·
IF 2.035
Hong-Qin Sun,Yang Du,Zi-Yang Zhang,Wen-Jing Jiang,Yan-Min Guo,Xi-Wu Lu,Yi-Min Zhang,Li-Wei Sun
Benzophenone (BP) andN,N-diethyl-3-methylbenzamide (DEET) are two chemicals often used in personal care products (PCPs). There is a lack of systematic ecotoxicological evaluations about the two chemicals to aquatic organisms. In the present study, the acute toxic effects onChlorella vulgaris,Daphnia Magana, andBrachydanio reriowere tested and the ecotoxicological risks were evaluated. For BP, the 96-h half-maximal effective concentration (EC50) onC. vulgariswas 6.86 mg/L; the 24-h median lethal concentration (LC50) onD. maganawas 7.63 mg/L; the 96-h LC50onB. reriowas 14.73 mg/L. For DEET, those were 270.72 mg/L, 40.74 mg/L, and 109.67 mg/L, respectively. The mixture toxicity of BP and DEET, onC. vulgaris,D. magana, andB. rerioall showed an additive effect. The induced predicted no-effect concentrations (PNECs) for BP and DEET by assessment factor (AF) method are 0.003 mg/L and 0.407 mg/L, respectively. Both are lower than the concentrations detected from environment at present, verifying that BP and DEET are low-risk chemicals to the environment.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 47
·e53180
·
IF 3.057
Yue Wang,Zhipeng Fang,Adeel Ahmed,Qiubo Wang,Hailin Cong,Youqing Shen,Bing Yu
In order to better realize the separation of chiral enantiomers and prevent chiral compounds with toxic side effects from causing harm to human beings, porous microspheres were modified to improve their chromatographic separation performance. In this paper, in order to verify the chromatographic performance of porous polymer microspheres, the precise and controllable synthesis of poly (styrene-divinylbenzene) (PS-DVB) microspheres was realized based on the two-step swelling method. Then, the porous PS-DVB microspheres were sulfonated with concentrated sulfuric acid. The sulfonated microspheres were grafted with diazo resin (DR), and then the 3,5-dichlorobenzene isocyanate modified β -cyclodextrin ( β -CD-DCIPI) was bonded to the sulfonated PS-DVB microspheres by the DR. Finally, the bond inversion occurred after UV irradiation. We have successfully solved the toxic effect of traditional coupling agents by using the unique photo-crosslinking reaction of DR. This novel and environmentally friendly chromatographic packing can be used to separate chiral compounds. The results showed that all of the eight compounds (chlorpheniramine; ibuprofen; benzoin; 2-phenylcyclohexanone; trans-stilbene oxide; Cobalt [III] acetylacetonate; Hesperetin; DL-Mandelic acid) can be separated. It is worth noting that the modified microspheres can achieve good separation of chiral compounds with the concentration of 1 mg/ml in 3 min.
研究领域:
分析化学
·
材料科学
·
药物化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Qianlin Huang,Hairong Zhang,Lian Xiong,Chao Huang,Haijun Guo,Xuefang Chen,Mutan Luo,Lanlan Tian,Xiaoqing Lin,Xinde Chen
The purification of lignocellulosic hydrolysate has great practical significance in the field of bioenergy and biorefinery. In this study, the effects of textural properties of styrene-divinylbenzene (St-DVB) adsorption resin prepared by oil/water suspension polymerization method on its adsorption capacities of sugar, fermentation inhibitors, and pigments in rice straw hydrolysate were investigated. The results showed that the Brunauer–Emmett–Teller (BET) surface area plays a pivotal role in the adsorption of pigments, furan derivatives, and acid soluble lignin (ASL), while the pore diameter is critical for the adsorption of organic acids and sugars. High distribution coefficient (22.80, 22.64, 7.26 mL/g, respectively) and selectivity coefficient (10.46, 10.39, 3.33, respectively) with respect to ASL, furfural and 5-hydroxymethylfurfural were achieved for the St-DVB adsorption resin obtained under the copolymerization conditions: mSt+DVB:mporogen = 1:1, mSt:mDVB = 1:1, mtoluene:mliquid paraffin = 1:1, moil:mwater = 1:3. In summary, the research provides guidance for choosing and designing adsorbent for the purification of lignocellulosic hydrolysate.
研究领域:
生物能源
·
生物质精炼
✓ 已验证
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Siming Huang,Jianqiao Xu,Xuan Tao,Xiao Chen,Fang Zhu,Ying Wang,Ruifen Jiang,Gangfeng Ouyang
Polyaniline/silver (PANI/Ag) composites were prepared with a one-step synthesis method, and fabricated into solid-phase microextraction fiber coatings through three different means, i.e. in situ growth, gluing and chemical bonding. This work explored the utility of the as-fabricated PANI/Ag SPME fibers as dual-functional platforms for microextraction and matrix-free laser desorption/ionization (LDI) of the target analyte. The results showed that after incorporating Ag into the PANI polymer , the LDI efficiency was improved by over two times, which was 92.8% the LDI efficiency of the commercial LDI plate. In addition, the in situ grown fiber coatings were observed the most sensitive as dual platforms for the analysis of bifenthrin . The signal intensity was increased over twenty times by using in situ grown fiber, comparing to direct analysis with commercial LDI plate, which were attributed to the excellent extraction ability of PANI backbone, as well as the high LDI efficiency of the PANI/Ag composites. Low detection limit (lower than 10 ng L −1 ) and good fiber-to-fiber repeatability (relative standard deviation 11.0%, n=3) were obtained by using the in situ grown coating for the analysis of bifenthrin , and bifenthrin in real water samples was successfully analyzed. The work successfully coupled SPME with matrix-free LDI, which greatly simplified the analytical process and improved the analytical sensitivity.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Jiankun Cao,Huayin Zhang,Sihui Liang,Qian Xu
Pyrene functionalized polyacrylonitrile nanofibers mat (Py-PAN NFM) was prepared via a green approach based on deep eutectic solvents . The Py-PAN NFM was further employed as solid-state fluorescent sensors for determining 2,4,6-trinitrotoluene (TNT) and 2,4-dinitrotoluene (DNT) in real water samples. In order to adapt to the hydrophobicity of Py-PAN NFM surface, the water samples were extracted by dichloromethane, and then the extraction solvents were directly dropped onto the Py-PAN NFM. The conversion of sample polarity ensures that Py-PAN NFM does not need to be immersed in the water samples for a long time. The target TNT and DNT can immediately interact with the pyrene fluorophores on surface of Py-PAN NFM, thus accelerating the detection speed. Because the targets were also enriched through the conversion process, the sensing sensitivity has been significantly improved and the limits of detection of TNT and DNT can reach 8.81 × 10 −9 M and 2.74 × 10 −8 M, respectively. The Stern–Volmer plots for fluorescence quenching by TNT and DNT displayed an overall linearity in the entire tested concentration range with quenching constants of 2.57 × 10 6 M −1 and 3.15 × 10 5 M −1 , respectively. Moreover, the selectivity study indicated that other nitro compounds have an insignificant effect on the fluorescence sensing detection of TNT and DNT, and Py-PAN NFM can be reused at least 6 times without degradation in fluorescence-quenching performance. The theoretical calculations demonstrated that photoinduced electron transfer was involved in the quenching process and the fluorescence lifetime measurements revealed that a static quenching mechanism was suitable to explain the quenching behavior. The experimental results fully proved the practicability of this method in the rapid and sensitive monitoring of nitroaromatic compounds.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 20
·8314-8320
·
IF 1.938
Zhuo Guo,Yin Lu,Jian Li,Xian-feng Xu,Guo-qing Huang,Ze-yu Wang
A nano-complex of graphene and La(OH)3 nanowires (GR–La(OH)3) was prepared for the fabrication of a voltammetric sensor, which was used to simultaneously determine the two isomers of dihydroxybenzene, hydroquinone (HQ) and catechol (CC). The modified electrode exhibited excellent sensitivity and selectivity in the determination of HQ and CC mixed in a 0.1 M Na2HPO4–C4H2O7 buffer solution (pH 4.0). Both HQ and CC appear to be a pair of quasi-reversible redox peaks and the potential difference between oxidation peaks of HQ and CC was 112 mV. Under the optimized conditions, the oxidation peak current of both HQ and CC was linear in the range of 5 to 300 μM in the presence of 50 μM of the other one in the solution. The detection limit was found to be 0.015 μM for HQ and 0.01 μM for CC (S/N = 3). The proposed method was further successfully applied to the simultaneous determination of HQ and CC in artificial wastewater samples, and the results showed good stability and high reproducibility.
研究领域:
分析化学
·
环境监测
·
电化学
·
纳米材料
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 42
·51233
·
IF 3.125
Jiali Xu,Li Yuan,Guozheng Liang,Aijuan Gu
It is still a challenge for simultaneously achieving high heat resistance, high strength and outstanding electrochemical performance for separators in power lithium-ion battery (PLB). Herein, new high performance electrospun separators are developed through building unique structure based on polyimide (PI) and poly (m-phenylene isophthalamide) (PMIA). Orthogonal tests (4 4 ) show that the magnitude order of electrospinning factors on the morphology of membrane is concentration>injection rate>receiving distance>voltage. With the optimum factors, the electrospun membrane (PI/PMIA) was prepared, which was further pressed at 100°C for 10 min to get treated membrane (H-PI/PMIA). Interestingly, the comprehensive performance of PI/PMIA is not a simple combination of those of PI and PMIA; instead, PI/PMIA has much better thermal and mechanical properties than both PI and PMIA, proving that PI/PMIA has a synergistic effect. PI/PMIA and H-PI/PMIA not only have good ionic conductivity and electrochemical stability, but also have superiorly high properties including dimensional stability (thermal shrinkage temperature>300°C), tensile strengths (24.1 MPa for PI/PMIA, 34.3 MPa for H-PI/PMIA) and capacity retentions (97.9%, 99.2%) compared with electrospun membranes for PLBs reported in the literature so far (SCI database). The mechanism behind these attractive performances is discussed from condensed structure of membranes.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Rui Hou,Xiaoshan Luo,Chuangchuang Liu,Lihua Zhou,Junlin Wen,Yong Yuan
Triphenyl phosphate (TPHP) is one of the major organophosphate esters (OPEs) with increasing consumption. Considering its largely distribution and high toxicity in aquatic environment, it is important to explore an efficient treatment for TPHP. This study aimed to investigate the accelerated degradation of TPHP in a three-electrode single chamber bioelectrochemical system (BES). Significant increase of degradation efficiency of TPHP in the BES was observed compared with open circuit and abiotic controls. The one-order degradation rates of TPHP (1.5 mg L −1 ) were increased with elevating sodium acetate concentrations and showed the highest value (0.054 ± 0.010 h −1 ) in 1.0 g L −1 of sodium acetate. This result indicated bacterial metabolism of TPHP was enhanced by the application of micro-electrical field and addition acetate as co-substrates. TPHP could be degraded into diphenyl phosphate (DPHP), hydroxyl triphenyl phosphate (OH-TPHP) and three byproducts. DPHP was the most accumulated degradation product in BES, which accounted more than 35.5% of the initial TPHP. The composition of bacterial community in BES electrode was affected by the acclimation by TPHP, with the most dominant bacteria of Azospirillum , Petrimonas , Pseudomonas and Geobacter at the genera level. Moreover, it was found that the acute toxic effect of TPHP to Vibrio fischeri was largely removed after the treatment, which revealed that BES is a promising technology to remove TPHP threaten in aquatic environment.
研究领域:
环境工程
·
生物技术
·
微生物学
·
水处理
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）