COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xu Ouyang,Lan Zhou,Xinliang Xu,Zhangyan Yang,Lei Wang,Lizhe Lu,Guojin Liu,Guoqing Zhang
In order to improve the encapsulation efficiency and shell properties of PMMA capsules, poly(MMA-co-TMPTA)/fragrance microcapsules were fabricated by in-situ polymerization with Trimethylolpropane Triacrylate (TMPTA) as the co-monomer. The poly (MMA-co-TMPTA)/fragrance microcapsules were characterized by scanning electron microscopy (SEM), thermogravimetric analyzer (TGA), pyrolysis gas chromatography-mass spectrometer (PGC-MS) and electronic nose (PEN-3). The results indicate that the poly(MMA-co-TMPTA)/fragrance microcapsules present pomegranate shape with rough and sunk surface and have the particle size in the range of 10−20 μm. poly(MMA-co-TMPTA)/fragrance microcapsules has good thermal stability, high encapsulation efficiency of 91.6 % and good slow-release property, and the fragrance on the fabric can be retained for more than 3 months.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-11
·
IF 4.122
Zhuang Xueheng,Zhang Ying,Cai Chang,Zhang Jing,Zhu Yuejin
Magnetic microencapsulated phase change materials (magnetic MicroPCMs) are hotly researched for their dual-functions with phase change and magnetic properties, which provided the new applications in fields of maneuverable phase change materials and infrared electromagnetic dual shield. A series of magnetic MicroPCMs samples are synthesized by polymerization and coprecipitation method and the chemical composition contained poly(MMA-MAA) @ n-octadecane modified by Fe 3 O 4 . In addition, the characterizations exhibit the excellent magnetic and phase change properties. The magnetic MicroPCMs samples present 20 emu·g −1 saturation magnetization with still high enthalpy of 132 J·g −1 , which fully illustrates that the magnetic MicroPCMs fulfill both application on thermal energy storage and magnetic control.
研究领域:
材料科学
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能源工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 4
·3111-3126
·
IF 3.553
Yu Chuanming,Jiang Jin’e,Liu Yeyuan,Liu Ke,Situ Ziqing,Tian Lifen,Luo Wenjing,Hong Pengzhi,Li Yong
Oil spills cause serious environmental pollution and serious waste of resources, hydrophobic porous absorbent has been deemed as a simple, low-cost, efficient and environment-friendly in oil–water separation. In this paper, a facile emulsion template method was developed to fabricate an interconnected porous poly(DVB-MMA) sponge. A novel co-Pickering stabilization system of Span 80 and NiFe 2 O 4 nanoparticles was applied to fabricate ultra-concentrated internal phase W/O emulsions. After further polymerization, the resulting sponge showed excellent adsorption selectivity due to superhydrophobicity and superlipophilicity. Also, the characterization results exhibited that the composite had superior thermal stability, low density, high porosity and flexible three-dimensional porous structure. Besides, waste PS plastic was introduced to enhance the structural integrity of composite, and the addition of NiFe 2 O 4 provided the material with magnetic operability. High oil adsorption capacity (up to 44.3–101.0 g/g), high oil retention, fast adsorption rate and superior recyclability allowed the material to be used in the fields of oil–water separation and oil pollution treatment.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 25
·e53968
·
IF 3
Wang Hui,Cui Mengbing,Chen Heng,Feng Jizheng,Zeng Yan,Zhou Hangyue,Chen Gairong
In this research, a new amphiphilic random copolymer of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and methyl methacrylate (MMA) (abbreviated as P(AMPS-co-MMA)) was synthesized by solution free radical copolymerization method, and was introduced into hydrophobic polyvinylidene fluoride (PVDF) membrane via nonsolvent induced phase separation (NIPS) process without adding pore-forming agent to enhance the permeability and antifouling properties of PVDF ultrafiltration membrane. The FT-NMR spectroscopy confirmed the chemical structure of P(AMPS-co-MMA) and copolymerization of AMPS and MMA, the effects of P(AMPS-co-MMA) on membrane surface chemical compositions, morphology, roughness, charge, hydrophilicity, permeability and antifouling properties were characterized in-detail. The results indicate that the PVDF/P(AMPS-co-MMA) composite membranes demonstrated excellent permeability, improved antifouling property and long-term stability due to the optimized membrane microstructure, stronger hydrophilicity and endowed negative charge. The PVDF composite membrane blended with 1.5 wt% P(AMPS-co-MMA) showed the best membrane performances, the pure water flux was 286.5 L·m −2 ·h −1 while the BSA rejection was as high as 98%, and the flux recovery ratio ( FRR ) and reversible fouling ratio to the total fouling ratio ( R r /R t ) reached 94.8% and 87% respectively, which outpaced ever reported and commercial PVDF membranes. Therefore, P(AMPS-co-MMA) copolymer was expected to be a potential excellent pore-forming material in fabricating high-performance membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON
·
2024
·
IF 2.1
Biyun Su,Qi Zhang,Paison Faida,Dou Yang,Liqin Ding,Boli Hou
The Schiff base condensation reaction was adopted to synthesize a series of pyridine-based quinoxaline ligands ( L1, L2, L3, L4 ) using 2-acetylpyridine and 1,2-phenylenediamine aromatic amines with different substituents of –OCH 3 , –F, -Cl, -Br. Then, four symmetrical dinuclear metal complexes ( 1–4 ) were obtained by coordination reaction of the synthesized ligands with CoCl 2 ·6H 2 O, and six unexpectedly systematic and novel solvent-involved asymmetric mononuclear metal complexes ( 1A-4A, 3B, 4B ) were obtained during single crystals cultivating by solvent diffusion method. The microscopic composition of the complexes were proved by a series of characterizations such as elemental analysis, IR and UV–vis. At the same time, by improving the single crystal culture technology, full crystal sample of compounds was obtained and X-ray single crystal diffraction showed a rare single crystal to single crystal structure transition (SCSC) phenomenon in this study. Furthermore, the catalytic properties of the complexes for MMA polymerization was explored, it was found that the catalytic activity of complexes 1–4 containing different types of substituents on pyridyl quinoxaline ligand was in the order of 1 < 2 < 3 < 4 , indicating that the complex with an electron-withdrawing substituent showed the higher activity than that of electron-donating substituent. Complexes 1A-4A, 3B and 4B showed higher catalytic activity in MMA polymerization than 1–4 , which confirmed that the catalytic activity of mononuclear complexes were generally higher than that of binuclear complexes.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2018
·Vol. 37
·期 8
·3650-3658
·
IF 2.073
Zhengping Fang,Xingning Zhang,Meng Xia,Wei Luo,Huiling Hu,Zhiguo Wang,Peixin He,Yuhong Zhang
By multicomponent mechanical blending technology, water-swelling rubber (WSR) was prepared through choosing chlorinated polyethylene (CPE), a superabsorbent polymer (cross-linking poly(sodium acrylate), CPNaAA), and compatibilizer (poly(methyl methacrylate-co-maleic anhydride), P (MMA-co-MAH)) along with other minor additives. P (MMA-co-MAH) was synthesized by grafting maleic anhydride (MAH) onto methyl methacrylate (MMA). Microstructure, water-absorbent properties, and mechanical properties of WSR were investigated. The results showed that P (MMA-co-MAH) boosted the dispersibility between CPNaAA and CPE and led to the increase in Shore A hardness, tensile strength, tensile stress at 100%, and water-swelling behavior, whereas the elongation at break and weight loss were decreased with P (MMA-co-MAH) content. When the content of P (MMA-co-MAH) reached 8 phr, the tensile strength, hardness, and water-swelling ability of dry-state WSR exhibited a maximum value and the percentage loss ratio of CPNaAA reached a relatively low value.
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
SURFACE AND INTERFACE ANALYSIS
·
2014
·Vol. 47
·期 2
·270-277
·
IF 1.393
Yongli Shi,Suying Ma,Ruiqiong Tian,Yingge Zhao,Qian Jiao,Xu Ma,Qing Shang
A novel amphiphilic copolymer was synthesized from poly (ethylene glycol) methyl ether methacrylate (PEGMA950), methyl methacrylate (MMA) and acryloyl- β -cyclodextrin (acryloyl- β -CD) using the composites of (NH 4 ) 2 S 2 O 8 /NaHSO 3 as the oxidation–reduction initiators. The successful fabrication of poly(PEGMA-co-MMA-co-acryloyl- β -CD) copolymers was confirmed by Fourier transform infrared spectrometer (FTIR), 1 H-nuclear magnetic resonance ( 1 H NMR) spectra. The amphiphilic copolymer could self-assemble into nanoparticles (NPs), and their morphology and particle size distribution were characterized with transmission electron microscopy (TEM), atomic force microscope (AFM) and dynamic light scattering (DLS) methods. Ibuprofen (IBU) was encapsulated in the novel NPs, and the release profiles of IBU were investigated. FTIR and 1 H NMR spectra illustrated that the poly(PEGMA-co-MMA-co-acryloyl- β -CD) copolymers were synthesized without any residual monomers and initiators. TEM and AFM photographs suggested that the obtained NPs were spherical, and the DLS results indicated that the diameter of blank NPs was 157.3 ± 32.7 nm. The IBU release profile showed that the IBU-loaded NPs had certain pH responsibility. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2018
·Vol. 27
·期 11
·881-887
·
IF 1.278
Zeng Le-Lin,Xie Wan-Yun,Yang Cai-Xia,Liang Enxiang,Wang Guo-Xiang
In this study, a novel photocatalyst, pentarylenebis(dicarboximide) dye: (1,6,13,18-tetra(4-(2,3,3-trimethylbut-2-yl)phenoxy)- N,N ’-(2,6-diisopropylphenyl)-pentarylene-3,4,15,16-tetracarboxidiimide) (TTPDPT), was first used in metal-free photoinduced atom transfer radical polymerization (ATRP) of methyl methacrylates (MMA). The initiator was methyl α-bromoisobutyrate (MBI) and the light source was mild near-infrared (NIR) light irradiation ( λ max ≈ 870 nm). The TTPDPT-mediated ATRP relies on in situ photoreduction of a MBI through an electron transfer process to generate the desired alkyl radical, which could induce polymerization of the monomer. The photoinduced metal-free ATRP of MMA shows typical characteristics of controlled free radical polymerization, showing the linear evolution of number-average molecular weight ( M n,GPC ) with monomer conversion, where polymers with predetermined degree of polymerization have well-controlled molecular weights and narrow molecular weight distribution ( M w / M n ). The photoinduced metal-free ATRP of MMA can be carried out with just ppm level of TTPDPT. The polymerization initiation and propagation can be operated by the aid of pulsed light sequences while NIR light source was used to promote carbon–carbon bond formation and to produce poly(methyl methacrylate) (PMMA) with M w / M n as low as 1.5. The synthesized PMMA was characterized by 1 H nuclear magnetic resonance ( 1 H NMR). The resultant PMMA contained a bromide end group that can be employed to reinitiate styrene polymerization to produce block copolymers through chain extension experiments.
研究领域:
高分子化学
·
材料科学
·
光化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Lanlan Tian,Mengkun Wang,Lian Xiong,Chao Huang,Haijun Guo,Shimiao Yao,Hairong Zhang,Xinde Chen
Poly (methyl methacrylate) (PMMA) based gel electrolyte has excellent chemical stability and low interfacial resistance but its mechanical strength is poor. In this study, organic palygorskite modified PMMA (p(OPal-MMA)/poly(vinylidene fluoride)) (PVDF) blend based electrolyte membrane was prepared via phase inversion casting technique. The physical and electrochemical properties of the blend membrane were investigated by XRD, SEM, tensile test and electrochemistry workstation. The results showed that PVDF can significantly improve the mechanical strength. The crystal phase of PVDF disappeared after blending. The porosity and ionic conductivity of the p(OPal-MMA)/PVDF membrane was 57.73% and 4.93 × 10 −3 S/cm respectively. The electrochemical stability window of Li/gel B-PVDF electrolyte/SS cell was stable up to 4.7 V (vs. Li + /Li), and the cell of Li/gel B-PVDF 43% electrolyte/LiFePO 4 exhibited good cycling performance and the Coulombic efficiency was maintained above 98.5% during all the cycling process.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
·
IF 2.108
Yun-fei Zhang,Rui Zhang,Chao-long Yang,Jing Xu,Jian Zheng,Man-geng Lu
Stable acrylate/triethoxyvinylsilane (VTES) core–shell emulsion with different mass ratio of MMA/BA in the core and shell was prepared via a modified micro-emulsion polymerization process. The chemical composition and core–shell structure were investigated by Fourier transform infrared (FTIR) spectrometry, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), respectively. Effect of MMA/BA mass ratio in the core and shell on the film-forming ability, surface tension of latex was also studied. Finally, water absorption and thermal stability of the latex films were characterized. It was found that the surface tension of emulsion can be reduced to 32.9 N/m when the MMA/BA mass ratio in the shell is 6/4. The water absorption of the latex film could be improved at a proper mass ratio of MMA/BA in core and shell, but adjusting the mass ratio of MMA/BA in the shell has little influence on the thermal stability of latex film. This work provides a method of preparing environment-friendly latex with low surface tension and excellent water resistance for coating applications by regulating the mass ratio of monomers in a modified micro-emulsion polymerization process.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Quan Wang,Shigang Shen
A novel porous monolithic column was synthesized via in situ free-radical polymerization within a stainless steel column (50 × 4.6 mm i.d.) by using triallyl isocyanurate and methyl methacrylate as co-monomers, ethylene glycol dimethacrylate as a crosslinking agent, 1,4-butanediol, 1- dodecanol , and N, N-dimethylformamide as tri-porogens, and azobisisobutyronitrile as an initiator. The optimized monolithic columns were investigated by scanning electron microscopy, a nitrogen absorption-desorption apparatus, and mercury intrusion porosimetry. The effect of mobile phase composition and temperature on chromatographic behavior was studied in detail as well. The results showed that homemade monolithic columns not only have relative uniform porosity structure, low back pressure, and high thermal stability, but also show high column efficiency, the theoretical plates number of the new polymer monolithic column exceeded 31,000 plates m −1 . Good resolution was achieved for HPLC separation of small molecules, including polycyclic aromatic hydrocarbons , isomers of phenols, and the Chinese herbal medicine notoginseng. Methodological validation of six drugs in notoginseng show that correlation coefficients of the linear regressions were in the range of 0.9989–0.9997; the value of relative standard deviation for precision were in the range of 1.37–4.21% for intra-day and 0.34–5.31% for inter-day, respectively; the values of accuracy expressed by recovery were in the range of 100.57–102.51%, 95.18–102.68%, 101.61–102.82%, 100.94–102.40%, 100.99–103.15% and 99.49–103.91% for the six drugs in order, respectively. Taking aromatic hydrocarbons as samples, the relative standard deviation values of the run-to-run (n = 5) and column-to-column (n = 5) based on peak area were < 2.01% and 2.39%, and two RSDs based on retention time were < 2.56% and 2.23%, respectively. The result showed that the polymer monolithic column has good separation ability and high permeability for small molecular substances.
研究领域:
分析化学
·
药学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS & POLYMER COMPOSITES
·
2022
·
IF 1.841
Ming Gong,Daijun Zhang,Jiayang Zhang,Jun Li,Xiangbao Chen
Vinyl polymerization is an important path for in-situ polymerization of thermoplastic resins. BPO (Benzoyl peroxide) and DMT (dimethyl-p-toluidine) were chosen to initiate the radical polymerization of MMA (methyl methacrylate) in this work. Optimization of initiator concentration was studied through reaction rate of polymerization progress and properties of PMMA (polymethyl methacrylate). At first, the catalytic of DMT in MMA polymerization was studied through polymerization experiments and rheological experiments. Results showed that DMT could catalyze more than one molecular BPO in the whole reaction period. It can catalyze the decomposition of BPO after being connected to PMMA chains. Second, the BPO: DMT ratio was set to 2:1 to study the ideal content by comparing the mechanical properties of PMMA. Results showed that with the increase of initiator contents, Tg, molecular weight, and residual monomer were all declining. Meanwhile, the mechanical properties of PMMA matrix first increased and then decreased. This phenomenon was analyzed by 1H-NMR and SEM. And the optimal BPO-DMT concentration was 1.0 mol%–0.5 mol%.
研究领域:
材料科学
·
化学工程
✓ 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）