MATERIALS & DESIGN
·
2016
·
IF 3.997
Zixiang Weng,Jianlei Wang,T. Senthil,Lixin Wu
Acrylonitrile butadiene styrene (ABS) nanocomposites with organic modified montmorillonite (OMMT) were prepared by melt intercalation. ABS nanocomposite filaments for fused deposition modeling (FDM) 3D printing were produced by a single screw extruder and printed by a commercial FDM 3D printer. The 3D printed samples were evaluated by tensile, flexural, thermal expansion and dynamic mechanical tests. The structure of nanocomposites were analyzed by TEM and low angle XRD . Results showed that the addition of 5 wt% OMMT improved the tensile strength of 3D printed ABS samples by 43% while the tensile strength of injection moulding ABS samples were improved by 28.9%. It was found that the addition of OMMT significantly increased the tensile modulus , flexural strength , flexural modulus and dynamic mechanical storage modulus, and decreased the linear thermal expansion ratio and the weight loss of TGA . These novel ABS nanocomposites with better mechanical and thermal properties can be promising materials used in FDM 3D printing.
研究领域:
材料科学
·
制造工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Yijian Wu,Hui Zhang,Baoqing Shentu,Zhixue Weng
Organo-montmorillonite (OMMT) was introduced into SEBS-g-MA toughened poly(phenylene oxide)/polyamide-6 (PPO/PA6) blends simply by melt extrusion. The effects of OMMT on morphology, rheology, and mechanical behaviors of toughened PPO/PA6 nanocomposites were studied by scanning electron microscope, transmission electron microscope, capillary rheometer and mechanical tests. The addition of OMMT could decrease the size of dispersed PPO domains in PA6 matrix and melt viscosity of the toughened PPO/PA6 nanocomposites. Besides, exfoliated OMMT also brought significant improvement of tensile properties and heat deflection temperature (HDT), simultaneously. For nanocomposites with exfoliated OMMT, OMMT induced more core–shell toughening particles with the optimized size, and thus, elastomer-OMMT synergistic toughening was achieved in the PPO/PA6 nanocomposites. Consequently, PPO/PA6 nanocomposites with high tensile strength, excellent impact performance, improved HDT, and good processability were obtained.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Natural Gas Science and Engineering
·
2015
·
IF 2.157
Hanyi Zhong,Zhengsong Qiu,Dong Sun,Daoming Zhang,Weian Huang
Polyetheramines as shale hydration inhibitors in water-based drilling fluids have attracted great interests in recent years. In this paper, in order to clarify the relationship between inhibitive properties and molecular structures of polyetheramines, several inhibitive experimental methods including bentonite inhibition test, shale cuttings hot-rolling dispersion test, sedimentation volume measurement, and API filtration measurement were adopted to evaluate the inhibition variation of different polyetheramines. Furthermore, a series of analytical methods such as surface tension determination, zeta potential measurement, XRD , contact angle measurement , and water adsorption test were performed to identify the relationship between the inhibitive performance and molecular structures. The factors including molecular weight , number of amine group, and molecular chain affecting the interaction between polyetheramines and clay particles were analyzed. Polyetheramine with molecular weight of 230 and oxypropylene segment can reduce the interlayer spacing of the hydrated clay to the minimum and exhibit the best performance in comparison with others. The coordination of electrostatic adsorption with monolayer arrangement, hydrogen bonding, and hydrophobic shielding effect contributed to the top level of inhibition.
研究领域:
石油工程
·
材料化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2012
·
IF 1.171
Xiantai ZHOU,Hongbing JI
The highly efficient aerobic oxidation of alcohols to carbonyl compounds was achieved catalyzed by cationic meso -tetrakis (1-methyl-4-pyridyl, TM4PyP) metalloporphyrins immobilized in montmorillonite interlayers. Cobalt porphyrin (CoTM4PyP-MT) showed excellent activity and selectivity in the aerobic oxidation of benzyl alcohol, where 90% yield of benzaldehyde was obtained. CoTM4PyP-MT can be five times reused without significant loss of activity. 摘要 制备了蒙脱土负载的离子型四 (1-甲基-4-吡啶基) 金属卟啉, 并用于催化醇类氧化制备羰基化合物的反应中. 结果表明, 该催化剂表现出优异的活性和产物选择性, 其中在苯甲醇氧化反应中, 苯甲醛收率可达 90%, 且连续重复使用 5 次后, 其活性未见明显下降.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yuchi Liu,Xiaopeng Zhao,Jianbo Yin
Polyethylene oxide (PEO)-salt complex is an important polymer electrolyte-based anhydrous electrorheological (ER) material. However, it is difficult to get PEO-based ER material in particle form owing to the low glass transition temperature . Cross-linking and copolymerization with other polymers are widely used ways to form polyether-salt complex with desired dimensions and stability. However, these ways are relatively complex, and the ionic conductivity of resulting products is also too high for ER application. In this paper, we report a simple way to form PEO-based nanocomposite ER particles by intercalation chemistry with montmorillonite (PEO-MMT) under the help of ethanol solvent. The structure and composition of samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy , thermogravimetry , and so on. An increase in basal d 001 -spacings demonstrates successful intercalation of PEO in MMT. The electro-responsive ER effect of PEO-MMT suspension under electric fields was studied. It demonstrated that PEO intercalation not only effectively solved the problem of difficult granulation of PEO ER material but also replaced the absorbed water in the interlayer of MMT and greatly limited the ionic conductivity of MMT. Under electric fields, the suspension of PEO-MMT nanocomposite was found to show significant ER effect, weak current density, and wide working temperature range. A significant interfacial polarization process was observed by dielectric spectra measurement, which can explain the significant ER effect of PEO-MMT nanocomposite.
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
ACS Applied Polymer Materials
·
2023
·
IF 5
Muhua Yuan,Haijun Wang,Tong Wang,Haibo Yang,Chunlei Yuan
The high dielectric constant of PVDF is very important for its high-performance energy storage dielectrics, but it is more critical to strike a proper balance between high dielectric constant and low dielectric loss. In this work, deep eutectic solvent (DES) and montmorillonite (MMT) have been used together to prepare γ-phase PVDF composite films with excellent dielectric properties. It is found that DES significantly induces crystallization of γ-phase and increases the dielectric constant of the composite due to the incremental ion motion. Meanwhile, DES greatly promotes the stripping and dispersion of MMT layers, which in turn inhibits the long-range ion migration and therefore suppresses the dielectric loss of the composite to a very low level. The dielectric constant of PVDF/MMT/DES composite films can increase to 32, while the dielectric loss remains as low as 0.06 at 1 kHz. Moreover, the synergistic effect of MMT/DES also contributes to enhancing the toughness and optical transmittance of composite films.
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
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 132
·期 2
·947-953
·
IF 2.209
Dai Xin,Wang Zhenxi,Zhang Xiaohang,Xu Sheng,Zhang Shangxi,Cao Meng,Jiang Xinde
To obtain multi-functional β-iPP composites, β-iPP composites are always filled by multiple fillers with α-nucleating ability. To prepare β-iPP/TiO 2 /MMT composites, TiO 2 -supported MMT with a β-nucleating surface was prepared through hydrolysis reaction of Tetra-n-butyl titanate and chemical reaction between pimelic acid and calcium ion. X-ray diffraction and scanning electron micrograph confirmed the formation of TiO 2 on the surface of MMT. The differential scanning calorimeter and X-ray diffraction illustrated that the β-iPP composites filled by TiO 2 and MMT had lower relative β-phase contents than β-iPP. It is observed by polarized optical microscope that addition of TiO 2 -supported MMT with a β-nucleating surface into iPP can increase the spherulite nuclei density and decrease the spherulite size significantly and obtain the β-iPP/TiO 2 /MMT composites with high relative β-phase content.
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
Silicon
·
2017
·Vol. 10
·期 2
·483-493
·
IF 0.829
Wen Zhao,Jincheng Wang
Polyamidoamine modified organo-montmorillonites (OMMT) bearing flame-retardant elements were prepared through montmorillonite (MMT) and polyamidoamines with different generations. These materials turned out to be a possible use for the flame-retardency of polymers. Different generations of dendrimers, G1.0, G2.0, and G3.0, were synthesized from a cyclotriphosphazene core. Characteristics of these dendrimers were studied by Fourier transform infrared (FTIR) spectroscopy, hydrogen nuclear magnetic resonance ( 1 H-NMR), ultraviolet (UV-Vis) spectroscopy, and intrinsic viscosity (IV). It was demonstrated that different generations of dendrimers had been well synthesized. These dendrimers were used as an organic intercalation agent to modify natural clay, Na + -MMT. Different generations of flame-retardant dendrimer modified OMMT, G1.0-OMMT, G2.0-OMMT, and G3.0-OMMT, were prepared. The interlayer spacing, thermal stability, and surface morphology of these dendritic MMTs were investigated by FTIR, thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) as well as energy dispersing spectrometry (EDS). It was seen that the thermal stability of G1.0-OMMT, G2.0-OMMT, and G3.0-OMMT was obviously improved with the increase of generations compared with that of MMT. In addition, an exfoliated structure existed in these dendrimer modified silicate layers.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 35
·45251
·
IF 1.86
Shan Wu,Lei Wang,Lixin Wu,Zixiang Weng,Yu Zhou
Although organically modified montmorillonite (OMMT) has been incorporated into unsaturated polyester (UP) resin to enhance properties, the aggregation often leads to defects which directly affect the properties of nanocomposites. In this work, OMMT slurry modified by a new allyl surfactant with carbon–carbon double bond, hexadecyl allyl dimethyl ammonium chloride (C 16 -DMAAC), was employed to prepare nanocomposites by in situ polymerization. The results illustrated that the existence of OMMT slurry helped monomers enter the OMMT galleries, leading to well-dispersed OMMT in the UP matrix. The mechanical properties and thermal properties of OMMT nanocomposites were improved. With OMMT loading of 5 wt %, the tensile strength and flexural strength can be improved by 22% and 38%, respectively. Meanwhile, the onset thermal decomposition temperature ( T –10 ) value was ameliorated from 310.6 °C to 330.6 °C. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45251.
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
APPLIED CLAY SCIENCE
·
2018
·
IF 3.641
Ying Xu,Muhammad Asim Khan,Fengyun Wang,Mingzhu Xia,Wu Lei
A novel multi amine-containing Gemini surfactant (including four positively charged N) modified organo-montmorillonite (GMt) was prepared and served as adsorbents of phenol, o-chlorophenol (2-CP) and 2,4,6-trichlorophenol (2,4,6-TCP). The structure and morphology of GMt were studied by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), N 2 adsorption/desorption isotherms (BET) and thermo gravimetric analysis (TGA). A batch technique was applied to investigate the influence of various factors, and the results illustrated that the saturated intercalation concentration of the modifier was 0.8 times to the cation exchange capacity (CEC) of the original Na-Mt and the adsorption was pH dependent, the optimum adsorption occurred at pH = 10, 7, 5 for phenol, 2-CP and 2,4,6-TCP, respectively. At the same conditions, the adsorption capacities of original Na-Mt were only 8.29 mg/g, 26.20 mg/g and 39.13 mg/g for three phenolic pollutants, while the maximum equilibrium adsorption amounts were 81.68 mg/g, 336.59 mg/g and 535.49 mg/g for phenol, 2-CP and 2,4,6-TCP, respectively. The adsorption kinetics of all the three phenols was in good agreement with the pseudo-second order kinetics model . The adsorption isotherm of 2,4,6-TCP was abided by Langmuir and Freundlich isotherm, however, phenol and 2-CP were better modeled by Freundlich isotherm. The negative values of ∆ G ° and positive values of ∆ H ° got from thermodynamic study confirmed that the adsorption of 2-CP and 2,4,6-TCP on GMt was a physical, spontaneous and endothermic process . The adsorption process of phenol was an exothermic process. Both adsorption and partition contributed to the adsorption of these three phenols to organo-montmorillonite.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2020
·Vol. 42
·期 1
·362-374
·
IF 2.265
Jianyu Qin,Wenchao Zhang,Rongjie Yang
To enhance the flame retardancy of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) on epoxy resins (EPs), by addition reaction with allyltriphenylphosphonium bromide (ATPB), a novel DOPO-containing phosphonium bromide (DOPO-ATPB) was synthesized and its structure was characterized by Fourier transform infrared (FTIR), 13 C nuclear magnetic resonance (NMR), and X-ray photoelectron spectroscopy (XPS). By intercalating DOPO-ATPB into montmorillonite (MMT) layers and with the help of solvents, the intercalated nanocompound (DPAB-MMT) was prepared, and X-ray diffraction (XRD) confirmed a d-spacing expansion of DPAB-MMT layers (from ~1.01 to ~2.10 nm). The epoxy composites with DOPO-ATPB and DPAB-MMT were prepared, and their effects on the flame retardancy, mechanical and dielectric properties were studied by limiting oxygen index (LOI), UL-94 vertical burning test, cone calorimetry, three-point bend testing, and the impedance analyzer. The results show that DOPO-ATPB endows EPs with excellent flame retardancy and dielectric properties, and DPAB-MMT can be well dispersed in EPs. Compared with pure EP, the EP/8 wt% DOPO-ATPB increased the LOI values from 23.0% to 32.5%, achieved V-0 rating and decreased the peak heat release rate (p-HRR) by approximately 36.6%. With the 8 wt% DPAB-MMT, the LOI values of epoxy composite was increased from 23.0% to 35.9%, the p-HRR was decreased by ~25.4%, the mechanical flexural strength was enhanced by approximately 13.4% and the dielectric loss ( ε ″) was decreased from 0.080 to 0.052 at 100 Hz.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jingqi Ji,Jianqing Zhao,Yangchuan Ke
In order to overcome the inherent defects of traditional polymer microspheres as plugging agent used in oilfields, including weak mechanical properties , low dispersity in water and poor adaptability to harsh conditions, an organo-modified montmorillonite (O-MMT) was incorporated to form an exfoliated structure in acrylamide/sodium 4-styrenesulfonate/2-acrylamido-2-methyl propane sulfonic acid (AM-SSS-AMPS) terpolymer matrix via in-situ polymerization. Such exfoliated structure not only exhibited a considerable enhancement in the comprehensive properties of nanocomposites , such as viscoelasticity , heat and shear-resistance, but also improved nanomechanical properties of microspheres. The results of nanomechanical properties showed that the energy dissipation and adhesion of nanocomposite with 3.0 wt% O-MMT were decreased to only 1.9% and 4.7% of those of the original terpolymer, respectively, implying the reduction in the agglomeration and energy consumption of microspheres in aqueous suspension. Rheology test demonstrated that the suspension (5.0 wt%) of nanocomposite microsphere with 2.0–3.0 wt% O-MMT behaved as pseudoplastic fluid, Newtonian fluid and dilatant fluid in turn at the shear rate from 10 s −1 to 1000 s −1 , which indicated a better arrangement of microspheres in suspension under shear stress. G′ and G′′ of the suspension of nanocomposite microspheres with 3.0 wt% O-MMT were 696.6 times and 84.4 times higher than those of the terpolymer suspension, respectively, and the corresponding viscosity was 10.4 times higher at 90 ℃. These superior properties of nanocomposite microspheres will meet the tough requirements of oilfield development.
研究领域:
材料科学
·
石油工程
✓ 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）