MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Ciyao Wang,Zhaoliang Xing,Shiyu Yan,Lirui Shi,Chuncheng Hao,Qingquan Lei
With the development of advanced power system, high energy storage polymer film capacitors have attracted more and more attention. Polypropylene (PP) membrane is the most commonly used polymer based membrane, accounting for 70% of the total market share of products. Due to its low dielectric loss, it has a high charge-discharge efficiency (η). However, its inherently low dielectric constant (2.2 at 1 kHz) seriously hinders the increase of energy storage density (1–2 J/cm 3 ). In this study, a ternary PP nanocomposite are prepared by melting blending and die pressing crosslinking, which greatly improved the capacitive properties of PP films. The discharge energy density (U e ) of PP nanocomposite films increased from 1.63 J/cm 3 to 4.11 J/cm 3 by adding a small amount (1 wt%) of BNNSs into PP matrix. U e increased significantly (152.1%). By utilizing the special layered structure provided by BNNSs, the energy storage capacity of PP/ PP-g-MAH /BNNSs is significantly improved.
✓ 已验证
产品关联
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.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 4
·2175-2183
·
IF 3.531
Lu Cheng,Wenfeng Liu,Ziqi Zhang,Yongcun Zhou,Shengtao Li
To simoutinusly achieve improved breakdown strength (BDS) and suppressed dielectric loss, a modified ternary nanocomposite composed of polypropylene (PP), maleic anhydride-grafted PP and core-shell structure SiO 2 @ZrO 2 nanoparticles is proposed. By tailoring the thickness of SiO 2 shell from 3 to 11 nm and the nanofillers content from 0.5 to 5 wt%, the particles disparsion is improved and meanwhile both the deep trap density and the interaction force between molecules are enhanced. In consequence, the restricted transportation of electrons along molecule chains as well as between chains together raise the DC BDS, that the BDS of optimum sample film reaches 430.8 kV/mm, 23% higher than neat PP. Besides, the ternary nanocomposites with SiO 2 @ZrO 2 less than 3 wt% maintain the tanδ below 0.3% at a broad frequency ranging from 0.1 Hz to 100 kHz, which is an extremely low level same as neat PP.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Xin Ge,Mingming Chang,Wei Jiang,Bangwen Zhang,Ruiguang Xing,Chaoke Bulin
In the present work, maleic anhydride (MA) and biphenyl peroxide (BPO) were used in the preparation of kaolin (K)/poly(ε-caprolactone) (PCL)/poly(lactic acid) (PLA) composites with melt compounding method. Composition and structure of the composites were characterized by Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM). Mechanical properties and thermal behaviors of the composites were further investigated. Kaolin selectively located in poly(ε-caprolactone) domains and at the phase boundaries, which improved the mechanical properties of the composites due to their rigid structure and high modulus. Influences of maleic anhydride on dispersion state of kaolin and two-phase structure of the composites were explored and discussed. Maleic anhydride enhanced the interactions among kaolin, poly(lactic acid) and poly(ε-caprolactone). Meanwhile, it improved the dispersion state of kaolin in the composites. In the presence of both kaolin and maleic anhydride, tensile strength at room temperature and storage modulus at 40 °C were enhanced to 41.2 MPa and 3.9 GPa, respectively.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Chengdong Yang,Mi Zhou,Yi Lin,Chong Cheng,Fei Cheng,Wenlong Liu,Puxin Zhu
Super-tough poly ( l -lactide) (PLLA) without compromising its biodegradability and biocompatibility was fabricated by reactive blending with PLLA and maleic anhydride grafted starch (MS)/poly (ethylene glycol) diacrylate (PEGDA). PEGDA as reactive compatibilizer exhibits higher compatibilization efficiency and significant plasticization effect in PLLA matrix. Fourier transform infrared spectroscopy (FT-IR) confirmed that PEGDA monomer successfully located at the molecules of MS and some interesterification reactions occurred between PEGDA and PLLA. The ductility of PLLA materials were significantly improved, for example, the elongation of break increased to 298% at the optimum PLLA/MS/PEGDA content. Dynamic mechanical thermal analysis (DMTA) demonstrated the glass transition temperature of blends decreased with the contents of MS/PEGDA increasing. The differential scanning calorimeter (DSC) results revealed that cold crystallization temperature and melting temperature of blends were decreased with the augment of the contents of MS/PEGDA. Wide angle X-ray diffraction (WARD) and DSC certified that a high crystalline article was obtained through practical extrusion process, which could propagate shear yielding deformation to dissipate energy during tensile fracture. Scanning electron microscope (SEM) demonstrated that the blends with PEGDA did not exhibit a visible phase-separated morphology from cryogenic fractured surfaces compared with the blend without PEGDA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULAR PHARMACEUTICS
·
2017
·
IF 4.44
Qian Wang,Chan Li,Tianyang Ren,Shizhu Chen,Xiaoxia Ye,Hongbo Guo,Haibing He,Yu Zhang,Tian Yin,Xing-Jie Liang,Xing Tang
Bioadhesive nanoparticles based on poly(vinyl methyl ether/maleic anhydride) (PVMMA) and poly(ethylene glycol) methyl ether-b-poly(d,l-lactic acid) (mPEG-b-PLA) were produced by the emulsification solvent evaporation method. Paclitaxel was utilized as the model drug, with an encapsulation efficiency of up to 90.2 ± 4.0%. The nanoparticles were uniform and spherical in shape and exhibited a sustained drug release compared with Taxol. m-NPs also exhibited favorable bioadhesive efficiency at the same time. Coumarin 6 or DiR-loaded nanoparticles with/without PVMMA (C6-m-NPs/DiR-m-NPs or C6-p-NPs/DiR-p-NPs) were used for cellular uptake and intestinal adhesion experiments, respectively. C6-m-NPs were shown to enhance cellular uptake, and caveolae/lipid raft mediated endocytosis was the primary route for the uptake of the nanoparticles. Favorable bioadhesive efficiency led to prolonged retention in the intestine reflected by the fluorescence in isolated intestines ex vivo. In a ligated intestinal loops model, C6-m-NPs showed a clear advantage for transporting NPs across the mucus layer over C6-p-NPs and free C6. The apparent permeability coefficient (Papp) of PTX-m-NPs through Caco-2/HT29 monolayers was 1.3- and 1.6-fold higher than PTX-p-NPs and Taxol, respectively, which was consistent with the AUC0–t of different PTX formulations after oral administration in rats. PTX-m-NPs also exhibited a more effective anticancer efficacy, with an IC50 of 0.2 ± 1.4 μg/mL for A549 cell lines, further demonstrating the advantage of bioadhesive nanoparticles. The bioadhesive nanoparticles m-NPs demonstrated both mucus permeation and epithelial absorption, and thus, this bioadhesive drug delivery system has the potential to improve the bioavailability of drugs that are insoluble in the gastrointestinal environment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
·
2017
·
IF 0
Jiale Cui,Zhihua Zhou,Yun Yang,Wenjuan Liu,Yunfei Zhao,Cheng Peng,Tianlong Huang,Hu Zhou,Lihua Liu,Qiao Zhang
In order to improve hydrophilicity and settle the acidity in hydrolysis, a novel ethanediamine (EDA) and maleic anhydride (MAH) modified poly(D,L-lactide-co-glycolide) (PLGA) polymer (EMPLGA) was synthesized. Fourier Transform Infrared Spectrometer (FTIR), Gel Permeation Chromatography (GPC), Nuclear Magnetic Resonance (1HNMR), titration and the water contact angles were employed to characterize the synthesized polymer. The effects of various polymerization conditions on weight average molecular mass (Mw), polydispersity index (PDI) and anhydride content of MPLGA were investigated. The degradation behaviors of PLGA, MPLA and EMPLGA were also studied by observation of the changes of the pH value of incubation medium, molecular weight and weight loss ratio for a time interval of 25 days in-vitro, respectively. The results showed that MPLGA with high anhydride content was successfully obtained by directly ring-opening polymerization and ethanediamine was further grafted onto MPLGA, and there is almost unchanged in Mw between MPLGA and EMPLGA polymers. The introduction of anhydride and amino groups improved the hydrophilicity of PLGA. A uniform degradation of EMPLGA was observed in comparison with an acidity-induced auto-accelerating degradation featured by PLGA and MPLGA. The results revealed that the introduction of ethanediamine into PLGA has weakened or neutralized the acidity of PLGA degradation products.
✓ 已验证
产品关联
DOI
Science China-Chemistry
·
2016
·Vol. 59
·期 4
·459-465
·
IF 2.429
Yuan Ye,Deng Sufen,Song Shaokun,Hu Weibo,Dong Lijie
In this paper, we reported a technique for the surface modification of poly-( p -phenylene terephthamide) (PPTA) powder coated with polydopamine (PDOPA). We used air oxidation to self-polymerize dopamine (DOPA) to ensure that the PPTA powder was coated. Our results indicate that the modified surface of PPTA powder enhances compatibility with the polymer matrix without damaging its structure. Additionally, it is possible to control the coating thickness of PDOPA by regulating the reaction time. The modified PPTA powder improved the comprehensive property of ethylene-propylene-diene-terpolymer grafted maleic anhydride (EPDM- g -MAH), and it proved that this method can enhance the strength and electric insulativity of EPDM- g -MAH.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 4
·1-10
·
IF 2.6
Yang Changlei,Wang Yanping,Liu Yufei,Qin Jun,He Min,Qin Shuhao,Yu Jie
The investigation of the polymerization kinetics and thermal degradation kinetics of maleic anhydride copolymers is of significant reference value for the synthesis of multifunctional and high-performance maleic anhydride-based copolymers and their applications in different fields. In this study, anhydride (MAH) derived styrene copolymers, namely Poly( N -phenylmaleimide-alt-styrene) (PNS), Poly( N -(4-carboxyphenyl)maleimide-alt-styrene) (PCS), andpoly(N-fluorine-phenylmaleimide-alt-styrene) (PFS), were prepared using a solution copolymerization method. The copolymerization kinetics and thermal degradation kinetics of MAH derived styrene copolymers were investigated using nuclear magnetic resonance (NMR) and thermogravimetric analysis (TGA), as well as the Arrhenius equation and Kim-Park method. The study revealed that the incorporation of carboxyl and fluorine groups had varying degrees of influence on maleic anhydride-styrene copolymers. The copolymerization rate constant ( K value) followed the order PNS>PCS>PFS, while the copolymerization activation energy ( E a ) followed the order PNS
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Kai Cui,Jiaming Yang,Yuli Jing,Junwen Chen,Chen Zhao,Peng Wu,Xiaohong Li
Sustainability issues have led to a gradual market expansion for the 1,4-butanediol (BDO) monomer of the biodegradable plastics to replace conventional plastics. Maleic anhydride (MA) can be derived from the oxidation of bio-based furfural or fructose. Although the hydrogenation of MA can produce a series of products, including succinic anhydride (SA), γ-butyrolactone (GBL), BDO and tetrahydrofuran (THF), the one-pot deep hydrogenation of MA to BDO or THF under mild conditions has been rarely reported in the literature until now. Herein, we report the production of BDO from the one-pot deep hydrogenation of MA over a Cu–0.03Mo/SiO2 catalyst, achieving 100% MA conversion and 88.3% BDO yield. The Cu–0.03Mo/SiO2 catalyst also showed good long-term stability without obvious loss in activity or BDO selectivity during a 160 h time-on-stream test. Doping Mo to Cu/SiO2 catalysts in an optimal amount adjusted the distribution of Cu0/Cu+ species and modulated the interaction of Cu–SiO2 and surface acidity, so that the activation of hydrogen, MA and relevant intermediates can become balanced, in addition to the restriction of side-reactions. This study provides potential for the green synthesis of BDO with non-precious Cu-based catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Min Deng,Chuxiang Zhou,Gang Wu,Yinan Xu,Shenwen Fang,Ming Duan
Anisotropic particles have garnered significant attention due to their unique structural characteristics, and emulsion polymerization is one of the synthesis strategies. In this study, for the first time, poly(styrene-maleic anhydride) (SMAA) and small-molecule surfactant were employed as the composite emulsifiers during the emulsion polymerization of styrene (St) for synthesizing peanut-shaped polystyrene (PS) nanoparticles. The results of NMR, FTIR, and SEM confirmed this method was reliable. Furthermore, the polymerization conditions were optimized by using particle morphology as the primary optimization parameter. The optimized polymerization conditions are as follows: St concentration of 11 wt%, emulsifier concentration of 0.6 wt% in water, the emulsifier being a composite system of sodium dodecylbenzenesulfonate (SDBS) and SMAA in a mass ratio of 1:2, initiator concentration of 0.5 wt% (relative to St mass), crosslinker dosage 0.6 wt% (relative to St mass), reaction temperature of 70°C, and the reaction duration of 6 h. The resulting polymer products exhibited a distinct peanut-like morphology, with an average particle diameter of 54.1 nm and an aspect ratio of 2.44. These findings provide some novel insights into the preparation of anisotropic particles.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Shuai Luo,Xiao-Xi Peng,Yun-Fei Zhang,Ping Fu,Fei-Peng Du
In order to improve the oil-repellent and antifouling ability of the antifog coatings, a poly(vinyl alcohol)/hydrolyzed poly (styrene-co-maleic anhydride)/fluorocarbon surfactant (PVA/H-PSMA/FC) was prepared by incorporating a fluorocarbon surfactant into PVA/H-PSMA via hydrogen bonds. The microstructure, antifog and oil-repellent properties were investigated in our study, and the results indicate that the strong interaction between the PVA/H-PSMA and the FC provides a good fixation for the FC inside or on the surface of the coatings. The water contact angle (WCA) ranges from 59° to 69° and the oil contact angle (OCA) ranges from 35° to 50°, which means that the PVA/H-PSMA/FC coatings are hydrophilic and oleophilic. The results also demonstrate that the prepared PVA/H-PSMA/FC coating exhibits excellent antifog properties and high transparency. Moreover, the oil droplets may slip off the coating surface without any residue and the glide angle is below 12°. A low content of FC loaded creates a large space between FC molecules, thus providing enough hydrophilicity on the PVA/H-PSMA surface and achieving excellent antifog performance. Meanwhile, the mobile fluorinated alkyl chains on the surface can be reorganized and act as “slides” to easily move oil droplets at low TA, providing oil repellency. The excellent oil-repellency makes the transparent PVA/H-PSMA/FC antifog coatings have potential application prospects in the field of surface protection of optical equipment and solar panel.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）