SEPARATION SCIENCE AND TECHNOLOGY
·
2015
·
IF 1.171
XiaoMei Zhang,HongZhan Li,ManLi Cao,Liang Shi,ChaoYue Chen
A new [#x003B2]-cyclodextrin functionalized poly (styrene-alt-maleic anhydride) was synthesized for removal of basic fuchsin (BF) and methylene blue (MB) from water via grafting reaction of [#x003B2]-cyclodextrin onto poly (styrene-alt-maleic anhydride) and then acylation with chloroacetyl chloride. Its structure was characterized. At a dosage of 0.25 g[#x000B7]L[#x02212]1, pH 6, and 25[#x000B0]C, adsorption equilibrium was reached in 600 min and maximum adsorption quantities to BF and MB were 295 mg[#x000B7]g[#x02212]1 and 528 mg[#x000B7]g[#x02212]1, respectively. The equilibrium data fitted the Langmuir isotherm and the adsorption kinetics data followed the pseudo-second-order model. Adsorption processes were endothermic, entropy gained, and spontaneous in nature within 288-308 K.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 34
·48986
·
IF 2.52
Wei Wei,Yingying Zhao,Bowen Zhang,Yuqing Cui,Xiaojie Li,Xiaoma Fei,Xiaoya Liu
Amino-modified silica nanoparticles (SiO 2 ─NH 2 ) were first prepared by hydrolytic condensation of tetraethyl orthosilicate and 3-aminopropylmethyldiethoxysilane. Then, organic–inorganic hybrid particles (SiO 2 ─SMA) were prepared by the amidation reaction between SiO 2 ─NH 2 and poly(styrene- alt -maleic anhydride) (SMA). Subsequently, SiO 2 ─SMA particles were employed for modifying bisphenol-A epoxy/anhydride thermoset. Compared with pure cured epoxy, the modified epoxy thermosets with only 1 wt % of SiO 2 ─SMA particles could achieve a simultaneous toughening and reinforcing performance. The tensile strength, impact strength, and fracture toughness of epoxy thermoset were increased by 14.1, 44.3, and 114.4%, respectively. Moreover, the modification also improved the thermal stability of epoxy thermosets, and the modulus and glass transition temperature of cured resin were not sacrificed. It can be attributed to the rigid structure of SiO 2 , as well as the anhydride and carboxyl groups onto the surface of SiO 2 ─SMA particles participating in the epoxy curing reaction and effectively enhancing the crosslinking density of epoxy thermoset.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Maojiang Yue,Guangju Qiu,Li Wang,Wantai Yang
The synthesis and application of thickening polymers for aqueous solutions are crucial in a multitude of industries. Herein, we propose the 4-dimethylaminopyridine (DMAP)-catalyzed esterification reaction between poly(styrene-alt-maleic anhydride) (SMA) and sugar (alcohol) for preparing a new type of thickening polymer. A thorough investigation of the esterification kinetics of SMA and sorbitol as well as the average reacted hydroxyl number (Ne) of sorbitol was conducted by a combination of Fourier transform infrared spectroscopy (FT-IR) and potentiometric titration. The present method can be extended to sugars, including sucrose and maltose, thus delivering SMA-g-sugar (alcohol) with diverse structures. The apparent viscosity of aqueous solutions thickened by SMA-g-sugar (alcohol) before and after further chain extension with diamine was evaluated by using a rotational rheometer. After chain extension with polyetheramine D230, great thickening property and excellent stability against thermal cycles and shear time can be achieved. The present method has broad compatibility, controllable polymer structure, and possibility for further chain extension, thus holding great prospect for preparing thickening polymers applied across different industrial sectors.
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
·
2016
·
IF 2.76
Yaping Li,Wangyan Nie,Pengpeng Chen,Yifeng Zhou
Sulfonated poly(styrene-alt-maleic anhydride) (SSMA) microspheres were prepared from poly(styrene-alt-maleic anhydride) (SMA) by sulfonation reaction and its adsorption behavior as an efficient adsorbent for the removal of organic dyes was systematically studied. The structure and morphology of SMA and SSMA were characterized by 13 C NMR, FTIR, EDS, XPS, SEM and TEM. The adsorption performance of SMA and SSMA toward organic dyes was investigated by batch mode adsorption experiments. Results indicated that the SSMA had much more adsorbability for cationic dyes such as methylene blue (MB) and Rhodamine B (RhB) compared to SMA. The adsorption capacity for MB of SSMA 8h which had been sulfonated 8 h was found to be 671.14 mg/g, while the adsorption capacity of SMA for MB was 344.83 mg/g at 25 °C, showing that the adsorption capacity for cationic dyes was enhanced 94.63% via the sulfonation. The kinetic studies revealed that the sorption followed a pseudo-second-order kinetic model which indicated that the adsorption interaction between adsorbent and adsorbate molecules was chemisorption. Moreover, adsorption isotherm mechanisms were analyzed by Freundlich and Langmuir models.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2013
·
IF 1.848
Jingcheng Liu,Ren Liu,Yan Yuan,Shengwen Zhang,Xiaoya Liu
Novel superhydrophobic antistatic coatings were prepared from the branched alternating copolymers P(St- alt -MAn) and carbon nanotubes through a facile method. Pristine multiwalled carbon nanotubes (MWCNTs) were non-covalently modified by an organic–inorganic hybrid of the branched copolymers P(St- alt -MAn) and silica with the existence of γ-aminopropyl-triethoxysilane. The modified MWCNTs were mixed with tetraethyl orthosilicate in ethanol, coated with a fluoroalkylsilane, and then heat treated to obtain the superhydrophobic antistatic coatings. Scanning electron microscopy (SEM) showed that the coatings have a micrometer- and nanometer-scale hierarchical structure similar to that of lotus leaves with high water contact angles (>170°). In addition, the relationship between content of MWCNTs and the properties of the coatings, as well as the effect of cure temperature on contact angle values were investigated systematically.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2016
·
IF 2.835
Kun Cao,Qing-jun Zhu,Xiang-xia Wei,Yun-fei Yu,Zhen Yao
A series of poly(styrene-alt-octadecyl maleimide)s [(alt)SNODMIs] with different molecular weights and molecular weight distributions were obtained through the reaction of octadecyl amine and poly(styrene-alt-maleic anhydride), which were synthesized using controlled free radical polymerization. The (alt)SNODMIs were assessed as flow improvers in two types of model waxy oils: one that was free of asphaltenes and one that contained asphaltenes. A differential scanning calorimeter, a polarizing microscope with a hot stage, and a rotational rheometer with parallel plate geometry were employed to characterize the crystallization temperature, the morphologies of the wax crystals and asphaltene particles, and the rheological behavior, respectively. The results indicate that the molecular weight and its distribution significantly affect the performance of the flow improver. In both model waxy oils, (alt)SNODMIs with a medium molecular weight achieved optimal effectiveness in decreasing the crystallization temperature, improving the morphology, and reducing the yield stress and viscosity. Moreover, (alt)SNODMIs with a narrower molecular weight distribution are more effective in the model waxy oil without asphaltenes, whereas the opposite result is found in the model waxy oil with asphaltenes.
研究领域:
化学工程
·
材料科学
·
石油工程
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Xiaoe Ma,Naizhen Zhou,Tianzhu Zhang,Wanjun Hu,Ning Gu
Self-healing materials are of interest for drug delivery, cell and gene therapy, tissue engineering, and other biomedical applications. In this work, on the base of biocompatible polymer poly(methyl vinyl ether- alt -maleic acid) (P(MVE- alt -MA)), host polymer β-cyclodextrin-grafted P(MVE- alt -MA) (P(MVE- alt -MA)- g -β-CD) and guest polymer adamantane-grafted P(MVE- alt -MA) (P(MVE- alt -MA)- g -Ad) were first prepared. Then through taking advantage of the traditional host-guest interaction of β-cyclodextrin and adamantane, a novel self-healing pH-sensitive physical P(MVE- alt -MA)- g -β-CD/P(MVE- alt -MA)- g -Ad supramolecular hydrogels were obtained after simply mixing the aqueous solution of host polymer and guest polymer. This kind of supramolecular hydrogels not only possess pH-sensitivity, but also possess the ability to repair themselves after being damaged.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 16
·13129-13136
·
IF 3.289
Xiaoe Ma,Naizhen Zhou,Tianzhu Zhang,Zhenchao Guo,Wanjun Hu,Changhao Zhu,Dandan Ma,Ning Gu
Biocompatible external stimuli-responsive hydrogels are of interest for drug delivery, cell and gene therapy, tissue engineering, protein patterning, and other biomedical applications. In this work, based on the biocompatible polymer poly(methyl vinyl ether-alt-maleic acid) (P(MVE-alt-MA)), host polymer β-cyclodextrin-grafted P(MVE-alt-MA) (P(MVE-alt-MA)-g-β-CD) and guest polymer azobenzene-grafted P(MVE-alt-MA) (P(MVE-alt-MA)-g-azo) were first prepared. Then through taking advantage of the traditional host–guest interaction of β-cyclodextrin and azobenzene, novel multiple stimuli-responsive physical P(MVE-alt-MA)-g-β-CD/P(MVE-alt-MA)-g-azo supramolecular hydrogels were obtained after simply mixing the aqueous solutions of the host polymer and guest polymer. The formation of the supramolecular hydrogels was also confirmed by 2D-NOESY. This kind of supramolecular hydrogels not only exhibits photo-, pH- and thermo-sensitivity, but also cytocompatibility. Ovarian cancer SKOV3 cells can survive within different hydrogel layers, which were observed by confocal microscopy. These results suggest that this multiple stimuli-responsive P(MVE-alt-MA)-based supramolecular hydrogel may be expected to have a powerful potential in biomedical applications as a three-dimensional (3D) cell culture matrix or as a vehicle for the delivery of drugs and therapeutic cells.
研究领域:
生物材料
·
药物递送
·
细胞培养
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Yufei Liu,Xiaojin Wang,Lulu He,Min He,Changlei Yang,Jie Yu
The poor heat resistance of acrylonitrile-butadiene-styrene copolymer (ABS) is a significant limitation that restricts its application in various fields, including automotive, electronic devices and other fields. To address this issue, we employed a strategy involving the crosslinking of a macromolecular heat-resistant agent to enhance the heat resistance of ABS. Poly(N-(4-fluorophenyl) maleimide-alt-triallyl isocyanurate) (PFT), a reactive heat-resistant agent known for its rigid and reactive structures, was selected for this purpose. ABS/PFT composites were prepared by subjecting them to γ-ray irradiation, resulting in crosslinking through a solid-state interfacial reaction (SSIR) between PFT and ABS. The results show that the heat distortion temperature ( HDT ), glass transition temperature ( T g ), tensile strength and bending strength of the irradiated ABS/PFT (i-ABS/PFT) composites increased by 23.86%, 23.35%, 20.0% and 9.0%, respectively compared to pure ABS. Furthermore, ABS/PFT composites with SSIR exhibit the highest heat resistance, T g and HDT compared to non-SSIR ABS. The work presented in this paper provides a new direction for the heat-resistant modification of ABS and will expand its application in new fields.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 13
·e55172
·
IF 2.7
Guochen Wang,Weiping Xu,Yanxin Zhang,Dong Chen,Yuhong Ma,Changtong Song,Wantai Yang
Dynamic B O bonds are often applied to fabricate reversible-cross-linking and reprocessable polymer networks due to their high thermodynamic stability and kinetic tunability. However, it is still difficult to tailor boronic ester polymers, which have both excellent mechanical and self-healing properties in the absence of external stimuli. To address the above challenge, a range of room-temperature self-healable vitrimers are prepared by the reactions of various poly(vinyl hydroxyalkyl ether- alt -dialkyl maleate) copolymers and 1,4-phenyldiboronic acid. The dynamic cross-linking networks offer the as-prepared vitrimers superior mechanical properties and thermostability. Because of the presence of dynamic boronic ester bonds, the networks also demonstrated self-healing (the tensile strength recovered to 83% after 3 days at room temperature) and reprocessing capabilities (no significant change in tensile strength after thrice process recycles). Moreover, the vitrimers have potential as promising damping materials with wide temperature windows around room temperature. For example, the vitrimer of poly(ethylene glycol monovinyl ether- alt -dibutyl maleate) and 1,4-phenyldiboronic acid demonstrates its tan δ max 1.18, T g = 6.2°C and effective damping temperature range is from −16.4 to 48.5°C.
研究领域:
材料科学
·
高分子化学
·
机械工程
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 27
·4054-4063
·
IF 5.364
Tianxiao Chang,Hongyi Qi,Chenxi Liang,Yanbin Huang,Wantai Yang
Benzothiophene is an under-explored monomer for free radical polymerization. Here we report the preparation of poly(benzothiophene-alt-maleic anhydride) (PBTMA) microspheres with high yield by self-stabilized precipitation polymerization. The chemical structure of the PBTMA copolymer was characterized by 1H-NMR, 13C-NMR, FT-IR and MALDI-TOF MS analyses. The effects of various reaction parameters, including the reaction medium, the monomer concentration, the initiator concentration and the reaction time, on the morphology, particle size and molecular weight (Mn) of the resultant PBTMA microspheres were investigated systematically. The experimental results demonstrated that the PBTMA copolymer was an alternating copolymer, whose composition was independent of the monomer composition. Uniform PBTMA microspheres with the diameter in the range of 400 nm to 3000 nm and Mn up to 12 000 g mol−1 were easily prepared. PBTMA had good solubility in common polar organic solvents and possessed much higher thermal stability than other maleic anhydride copolymers. PBTMA also showed interesting fluorescence properties both in the solid state and in solution. This research has laid the foundation for the further development of PBTMA copolymers as a new material.
研究领域:
高分子科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEDICAL VIROLOGY
·
2024
·Vol. 96
·期 6
·e29723
·
IF 6.8
Dekai Zheng,Changhao Cheng,Yanhua Tang,Zhixin Fang,Xuelian Gao,Yuchuan Chen,Qiuhong You,Kaifeng Wang,Heqi Zhou,Zhixian Lan,Jian Sun
Hepatitis B virus (HBV) can be completely suppressed after antiviral treatment; however, some patients with chronic hepatitis B (CHB) exhibit elevated alanine aminotransferase (ALT) levels and sustained disease progression. This study provides novel insights into the mechanism and potential predictive biomarkers of persistently elevated ALT (PeALT) in patients with CHB after complete viral inhibition. Patients having CHB with undetectable HBV DNA at least 12 months after antiviral treatment were enrolled from a prospective, observational cohort. Patients with PeALT and persistently normal ALT (PnALT) were matched 1:1 using propensity score matching. Correlations between plasma metabolites and the risk of elevated ALT were examined using multivariate logistic regression. A mouse model of carbon tetrachloride-induced liver injury was established to validate the effect of key differential metabolites on liver injury. Of the 1238 patients with CHB who achieved complete viral suppression, 40 (3.23%) had PeALT levels during follow-up (median follow-up: 2.42 years). Additionally, 40 patients with PnALT levels were matched as controls. Ser-Phe-Ala, Lys-Ala-Leu-Glu, 3-methylhippuric acid, 3-methylxanthine, and 7-methylxanthine were identified as critical differential metabolites between the two groups and independently associated with PeALT risk. Ser-Phe-Ala and Lys-Ala-Leu-Glu levels could be used to discriminate patients with PeALT from those with PnALT. Furthermore, N -acetyl- l -methionine (NALM) demonstrated the strongest negative correlation with ALT levels. NALM supplementation alleviated liver injury and hepatic necrosis induced by carbon tetrachloride in mice. Changes in circulating metabolites may contribute to PeALT levels in patients with CHB who have achieved complete viral suppression after antiviral treatment.
研究领域:
肝病学
·
代谢组学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）