FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 8
·1123-1130
·
IF 1.022
Guo Mulin,Zhang Chao,Xu Jianjian,Luo Zhengwei,Wei Wuji
An efficient, simple and facile process, i.e., suspension grafting polymerization combined with melt-blown technique, was employed to synthesize Polypropylene-g-(acrylic acid-co-acrylamide) nonwoven fabrics [PP-g-(AA-co-AM) nonwovens]. In this study, the grafting mechanism and the effect of synthesis parameters on grafting percentage (GP) were investigated. The as-synthesized products were characterized by melt flow rate (MFR), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), water contact angle (WCA) and thermalgravimetric analysis (TGA). Besides, the uptake properties of metal ions (i.e., Ba 2+ , Cu 2+ , Ni 2+ , Mg 2+ , Al3+, Ca 2+ ) on the PP-g-(AA-co-AM) nonwovens in dynamic condition were studied. Results of FTIR showed that AA and AM were successfully grafted onto the PP surface. The decrease in WCAs of the grafted nonwovens with the increasing GP indicated that (AA-co-AM) side chains existed as the hydrophilic component. TGA results revealed that no significant change in thermal stability was found in grafted PP samples. The synthesis experiments showed that the highest GP was obtained at grafting time 3 h, water 3 ml/g, xylene 15 wt%, benzoyl peroxide 0.5 wt%, AA, AM 30 wt% and AA: AM 1:1, with a GP of 16.7 %, and a grafting efficiency of 67 %. However, MFR measurement and SEM image demonstrated that PP-g-(AA-co-AM) nonwovens with the highest GP showed almost no mechanical strength existed between filaments resulting in the occurrence of deformation and contraction of nonwovens, and breaking up into small pieces. Comprehensively, the optimal GP was 8.7 %, and the corresponding PP-g-(AA-co-AM) nonwovens exhibited higher metal ions uptake capacity than pristine PP nonwovens in the dynamic adsorption process.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 56
·期 24
·244001
·
IF 3.4
Wenfeng Liu,Hongbo Liu,Lu Cheng,Shengtao Li
To improve the energy storage density while maintaining low dielectric loss is crucial for the miniaturization of capacitors. In the present study, we proposed a ternary nanocomposite system comprised of polypropylene (PP), acrylic acid grafted PP (PP-g-AA), and nano-ZrO2. The PP-g-AA was firstly prepared by a free radical grafting with the proportion fixed to 50 wt%, and the content of nano-ZrO2 ranged from 0.5 wt% to 5 wt% to tailor the ternary composite. The transmission electron microscope observation showed that PP-g-AA could significantly benefit the dispersion of nanoparticles and the differential scanning calorimetry results indicated the superior compatibility of the ternary nanocomposites. Accordingly, with the optimum nano-ZrO2 content of 0.5 wt%, the ternary nanocomposites achieved the permittivity of 2.7 and DC breakdown strength of 456.2 kV mm−1, resulting in the enhanced energy density of 2.77 J cm−3 which was 60% higher than neat PP, while the dielectric loss was kept lower than 0.003. Moreover, even at the temperature of 120 °C, the ternary nanocomposites maintained a high-performance energy storage density of 2.28 J cm−3 (with energy storage efficiency above 90%), which was 670% of the neat PP.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Na Han,Sumei Chen,Guo Chen,Xuefeng Gao,Xingxiang Zhang
We report the preparation and performance of poly(acrylonitrile-methacrylate) (AN-MA) flat-sheet membranes with various MA feeding ratio via thermally induced phase separation, in which the membrane forming system consisted of AN-MA, ethylene carbonate (EC), and triethyl citrate (TEC). The effects of the preparation conditions, such as the MA feeding mole ratio, EC content in the mixed diluent, and AN-MA concentration on the pore structure, porosity, water flux, and mechanical properties of the AN-MA membranes were studied. The poly(acrylonitrile-methacrylate) (AN-MA mole ratio 85/15, 80/20, 75/25) copolymers were synthesized by emulsion polymerization. The AN-MA copolymers are melt processable in the temperature range of 130–180°C. The morphology of the resulting membrane gradually changes from a typical bicontinuous structure to a cellular structure upon increasing the polymer concentration and EC content in the mixed diluent. The water flux of AN-MA microporous membranes increased and subsequently declined as the MA feeding molar ratio increased in the polymerization system. In addition, the mechanical properties of the AN-MA membranes increased gradually. Consequently, the properties of the AN-MA membranes were optimal when the MA feeding molar ratio was 20 mol%. Correspondingly, the membrane exhibits a relatively high water flux (66.0 L/(m2 h)) and porosity (75%) when the ternary system contains 60 wt.% EC in the mixed diluent and 9 wt.% 80/20AN-MA. In addition, the membrane exhibits a higher tensile strength (4.6 MPa) and elongation (43.8%).
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2012
·
IF 0.887
Lijun Chen,Wei Jiang,Hongxin Shi,Hongke Wu,Juping Xiang
The novel poly (AN-BA-DFMA) was prepared via semi-continuous seeded emulsion polymerization. The resultant novel latex is characterized with FTIR and DSC. The reaction conditions for preparing the novel latex are optimized and studied in detail. Results show that the novel latex with small particle size and good stability and hydrophobicity can be obtained when the amount of emulsifiers is 6.0%, the mass ratio of OP-10 to SDBS is 2.0:1.0, and the amount of initiator and DFMA is 2.5% and 20%, respectively. Under such conditions, the conversion rate is high and the coagulation percentage is low.
研究领域:
高分子化学
·
材料科学
·
功能材料
·
纳米材料
·
表面化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 17
·6249
·
IF 4.6
Yue Lu,Jingke Wei,Haojie Jin,Liming Tang
To overcome the shortcomings of the temperature sensitivity of exterior flexible facing tiles (EFFIs), a series of crosslinking carboxylic styrene-acrylate (SA) latices were prepared via the semicontinuous seed emulsion polymerization of glycidyl methacrylate (GMA), methacrylic acid (MAA), acrylic acid (AA), butyl acrylate (BA), and styrene (St), and were applied as binders to fabricate EFFTs with mineral powder. The obtained latices exhibited Bragg diffraction because of the narrow particle size distribution. Owing to the low dosage of emulsifiers and the crosslinking reaction between the epoxy group and the carboxyl group, the latex films displayed excellent water resistance, with water adsorption as low as 7.1%. The tensile test, differential scanning calorimeter (DSC) test, and dynamic mechanical analysis (DMA) indicated that at a GMA dosage of 4–6% the latex films had high mechanical strengths, which remained relatively stable in the temperature range of 10 to 40 °C. The optimal AA dosage was found in the range of 2 to 3%, at which the wet mixture exhibited good processability, conducive to forming an EFFT with a compact microstructure. Using the optimal SA latex, the obtained EFFT displayed a series of improved performances, including low water absorption, high mechanical strength, and stable self-supporting ability over a wide temperature range, exhibiting the application potential in the decoration and construction industries.
研究领域:
材料科学
·
聚合物化学
·
建筑材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 8
·1459-1467
·
IF 1.113
Guo Mulin,Chen Haonan,Luo Zhengwei,Lian Zhouyang,Wei Wuji
Polypropylene-based chelating fibers grafted with acrylic acid and acrylamide side chains were simply synthesized, and subsequently employed as adsorbents for Pb(II) removal selectively from aqueous solutions. The assynthesized fibers were characterized by elemental analysis, Fourier transform infrared spectroscopy, scanning electron microscope, and water contact angle. The adsorption results revealed that kinetics data were fitted by a pseudo-second order model (semi-saturation time 6.2 min), thereby suggesting chelating interaction to be the main mechanism during the adsorption process. The adsorption isotherm data fitted well with a Langmuir model. The thermodynamic study revealed the adsorption of Pb(II) as an exothermic spontaneous chemisorptive process. Coexisting Na(I), Mg(II), and Al(III) in solution showed negligible effects in the adsorption process. As confirmed by carboxyl amination, the carboxylate oxygen preferentially chelates coexisting Ca(II) over Pb(II), thereby leading to lower extents of Pb(II)-O chelate interaction. The spent fibers were effectively and repetitively (five cycles) regenerated while maintaining high performance upon treatment with 1 M hydrochloric acid solutions.
研究领域:
环境化学
·
高分子材料科学
·
水处理技术
·
吸附分离
·
重金属污染控制
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2018
·Vol. 219
·期 18
·1800266
·
IF 2.492
Jing Zheng,Mengxiang Zhu,Gaia Ferracci,Nam-Joon Cho,Bae Hoon Lee
Gelatin methacryloyl (GelMA; GM) is a promising nature-derived photocurable material that can mimic the extracellular matrix because GelMA features tailorable mechanical properties, proteolytic degradation, and good cell adhesion. GelMA contains not only methacrylamide but also methacrylate. However, the hydrolytic stability of methacrylamide and methacrylate groups of GelMA in aqueous solutions has not been scrutinized. Here, the structural change of GelMA through hydrolysis is investigated for the first time. The structural change of hydrolyzed GelMA is quantitatively identified using colorimetric and 1 H NMR methods. The methacrylate groups decompose markedly at high pH solutions, but the methacrylamide groups remain stable. Further, pure gelatin methacrylamide is successfully decoupled from GelMA for a better understanding of GelMA structure and future use for biomedical applications.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2019
·Vol. 7
·期 6
·377
·
IF 1.963
Taotao Liang,Xiaogang Guo,Abdulmoseen Segun Giwa,Jianwei Shi,Yujin Li,Yan Wei,Xiaojuan Wang,Xuansong Cao,Xiaofeng Tang,Jialun Du
Methyl methacrylate (MMA) plays a vital role in national productions with broad application. Herein, the production of MMA is realized by the improved eco-friendly direct methylation method using Aspen Plus software. Three novel kinds of energy-saving measures were proposed in this study, including the recycle streams of an aqueous solution, methacrolein (MAL), and methanol, the deployment of double-effect distillation instead of a normal one, and the design of a promising heat-exchange network. Moreover, MMA with a purity of 99.9% is obtained via the design of a MAL absorber column with an optimal stage number of 11 and a facile chloroform recovery process by using the RadFrac model. Thus, the proposed green process with energy-conservation superiority is the vital clue for developing MMA, and provides a reference for the production of MMA-ramifications with excellent prospects.Keywords:MMA;double-effect distillation;energy conservation;MAL;purity
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.039
Wenbo Hu,Yongping Bai,Chun Zhang,Ning Li,Baoqiang Cheng
In this paper, a polymeric coating based on the modified chlorinated polypropylene (CPP) emulsion was synthesized, methyl methacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA) were grafted onto CPP backbone and phase inversion was conducted to obtain waterborne emulsion. Results showed that the concentration of initiator (BPO) had the greatest effect on graft copolymerization. The concentration of emulsifier and temperature influenced the results of phase inversion. Besides, the thermal performances of modified CPP were better than untreated one. In addition, the coating obtained in optimum condition had excellent adhesion to BOPP film, and apparently improved the printing quality of the film. The printability promotion should be attributed to the different movement trend of coating’s polar and un-polar chains during the baking step, as well as the subsequent formations of new coating/substrate and coating/ink interface layer.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
·
IF 17.694
Ke Jingwen,Zhao Jiankang,Chi Mingfang,Wang Menglin,Kong Xiangdong,Chang Qixuan,Zhou Weiran,Long Chengxuan,Zeng Jie,Geng Zhigang
The electrooxidation of propylene into propylene oxide under ambient conditions represents an attractive approach toward propylene oxide. However, this process suffers from a low yield rate over reported electrocatalysts. In this work, we develop an efficient electrocatalyst of Ag 3 PO 4 for the electrooxidation of propylene into propylene oxide. The Ag 3 PO 4 cubes with (100) facets exhibit the highest yield rate of 5.3 g PO m −2 h −1 at 2.4 V versus reversible hydrogen electrode, which is 1.6 and 2.5 times higher than those over Ag 3 PO 4 rhombic dodecahedra with (110) facets and tetrahedra with (111) facets, respectively. The theoretical calculations reveal that the largest polarization of propylene on Ag 3 PO 4 (100) facets is beneficial to break the symmetric π bonding and facilitate the formation of C-O bond. Meanwhile, Ag 3 PO 4 (100) facets exhibit the lowest adsorption energies of * C 3 H 6 and * OH, inducing the lowest energy barrier of the rate-determining step and thus accounting for the highest catalytic performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Chong-Jiang Lv,Hui Li,Akram Yasin,Bin Hao,Xiu Yue,Peng-Cheng Ma
Copolymer consisting of acrylonitrile (AN) and acrylic acid (AA) segments with different molar ratios were synthesized via a mixed-solvent precipitation polymerization method. The prepared polymer was then applied to fabricate nanofiber membrane via electrospinning technique. It was found that when the molar ratio of AN/AA was 80/20, the resultant membrane presented outstanding hydrophilicity with a water contact angle of 0° and water adsorption ratio of 17.10. In addition, the breaking force of optimized membrane was increased by more than 60% when comparing with those of pure PAN homopolymer counterpart due to the hydrogen bonding interaction resulting from the carboxyl groups in AA chain segments. The developed membrane possessed fascinating underwater oleophobicity with oil contact angle over 150° and could effectively separate oil/water mixture and oil-in-water emulsion with excellent separation efficiency beyond 95%, ascribing to the hydration layer on the membrane surface and size-sieving effect arising from the multi-scale pore size in the material. The current study provides a novel insight into the fabrication of hydrophilic membrane for oily wastewater treatment for practical applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2025
·
IF 3.9
Chen Li,Hong Zhang,Siyao Gu,Wenlong Lu,Xinyu Chen,Liuliu Zhong,Mingjun Zheng,Hui Wan,Lei Wang,Guofeng Guan
The selective oxidation of methacrolein (MAL) to methacrylic acid (MAA) is a crucial step in the C4 process for producing methyl methacrylate (MMA). While Cs-modified polyoxometalates (POMs) are known to enhance the catalytic activity in this reaction, wherein the influence of different cesium sources on their performanc remains unexplored. This work systematically investigates the effect of varying cesium sources onthe performance of (NH 4 + ) X Cu 0.2 CsH 2.8-X PMo 11 VO 40 (BPAV) series catalysts. Characterization results show that the introduction of CsOH facilitates the formation of spherical microstructures in the catalyst, significantly increasing its specific surface area (13.74 m 2 /g) and medium acid amounts (1.46 mmol/g). XPS analysis further confirms that CsOH enhances the interaction between cesium ions and polyoxometalate anions, promoting the electron transfer from Cs ions to POM anions and the formation of abundantV 4+ species (V 4+ /V 5+ = 2.23) for enhanced redox capability. The BPAV catalyst with CsOH/POM molar ratio of 1 achieves the optimal performance, exhibiting 85.5% MAL conversion and 90.5% MAA selectivity. Furthermore, the BPAV catalyst with CsOH source also demonstrated excellent catalytic performance in the selective oxidation of propionaldehyde and isobutyraldehyde, with product selectivity surpassing 90% in both reactions. These findings offer new insights and perspectives for the design of high- efficiency aldehyde oxidation catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）