MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Jinyuan Bai,Yang Liu,Yanjun Hou,Shuhong Wang
A new luminescent europium(III) bis-β-diketonate complex, Eu 2 (PBT) 3 (NO 3 ) 3 (PBT = 1,1-(pyridine-2,6-diyl)bis(4,4,4-trifluoro-1,3-dione), was incorporated into the poly(methylmethacrylate) (PMMA) matrix and formed nanofibers via electrospinning technology. The different characterization techniques were adopted to reveal the effect of Eu 2 (PBT) 3 (NO 3 ) 3 on the spatial structure and optical properties of the nano-composite fibers obtained. The doping enhances the thermal stability and filament-forming properties for a series of PMMA-supported composite nanofibers Eu/PMMA, and in particular, the doping concentrations of 11 wt% also showed more efficient luminescence properties. Furthermore, the Judd-Ofelt theory was applied in this study to explain the effect of the distribution of Eu 2 (PBT) 3 (NO 3 ) 3 and the mutual effect of the Eu 2 (PBT) 3 (NO 3 ) 3 coordination compound and surrounding fractions of PMMA.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 28
·
IF 1.768
Hang Xu,Haicun Yang,Liu Zhang,Qingting Ni,Fanghong Gong
The Core-shell hybrid particles with attapulgite (ATP) as the core and polymethylmethacrylate (PMMA) as the shell (ATP- g -PMMA) were prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization method. The diameter of ATP- g -PMMA was increased to 50–60 nm, and the surface hygroscopicity was decreased observably after surface grafting. Then, ATP- g -PMMA hybrid particles were filled into the polycarbonate (PC) by melt mixing to afford nanocomposites, and the mechanical properties, microstructures, thermal stability, and rheological behavior of nanocomposites were investigated by varying ATP- g -PMMA concentration in the range 1, 3, 5, and 7 wt % in PC. Fourier Transform infrared spectroscopy (FTIR) suggested that there is no esterification reaction between particles and matrix. Slight changes in tensile strength, and noticeable decrease of elongation and impact strength were observed with the increase in ATP- g -PMMA particles loading. The morphology evaluated by field-emission scanning electron microscopy (FESEM) indicated that ATP- g -PMMA was dispersed with a diameter range of 80–100 nm, and phase separation was appeared with increasing ATP- g -PMMA loadings. Thermogravimetric analysis (TGA) results revealed the thermal stability of composites was strengthened. The disentanglement and interface slip induced by preferred orientation and directional arrangement of ATP- g -PMMA resulted in lower complex viscosity (η*) and higher loss factor (tan δ) compared with the pristine PC. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42262.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yufei Tang,Lei Chen,Zihao Duan,Kang Zhao,Zixiang Wu
The introduction of BaTiO 3 (BT) particles into biomaterials, such as polymethyl methacrylate (PMMA) bone cement , is among the effective ways to improve their osteoinductivity. However, excessive addition leads to mechanical degradation . An important problem to solve is the manner by which piezoelectric properties matching human bones can be obtained under the premise of sufficient mechanical properties . The piezoelectric effect is obtained by adding BT particles into PMMA bone cement. The piezoelectric coefficient close to the human bone is obtained at a relatively low BT addition amount by adding graphene on this basis. High mechanical properties can also be obtained. Graphene increases the piezoelectric coefficient by increasing the conductivity, dielectric constant, and effective polarization voltage of graphene (G)/BT(BaTiO 3 )/PMMA bio-piezoelectric composites. The compression strength of the aforementioned composites increases from 83.5 MPa to 89.5 MPa after the addition of 0.5 vol% graphene, and the requirements of bone implant materials were met. G/BT/PMMA bio-piezoelectric composites have no cytotoxicity, and graphene can also promote cell adhesion and proliferation on the composite's surface. The polarized bio-piezoelectric composites can improve cell morphology and promote cell proliferation . The number of cells increases with increasing piezoelectric coefficient. The composite has potential application prospects in various fields, such as oral cavity and bone implant.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2014
·Vol. 36
·期 9
·1675-1684
·
IF 1.455
Lili Qin,Guohua Li,Jun Hou,Xiaoyan Yu,Huili Ding,Qingxin Zhang,Nongyue Wang,Xiongwei Qu
Poly (methyl methacrylate)/boron nitride (PMMA/BN) composites were prepared by dispersing BN particles into methyl methacrylate monomer phase by bulk polymerization method. BN particles modified with silane coupling agent, γ-methacryloxypropyl trimethoxy silane, were characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis. Effects of modified BN particle content on thermal conductivity were investigated, and the experimental values were compared with those of theoretical and empirical models. With 16 wt% of BN particles, the thermal conductivity of the composite was 0.53 W/(m·K), 1.8 times higher than that of pure PMMA. The microstructures of the PMMA/BN composites were examined by scanning electron microscopy, energy-dispersive X-ray analysis, and transmission electron microscopy. Dynamic mechanical analysis and thermogravimetric analysis traces also corroborated the confinement of the polymer in an inorganic layer by exhibiting an increase in glass-transition temperatures and weight loss temperatures in the thermogram. Mechanical properties and electrical insulation property of the PMMA/BN composites were also determined. These results showed that PMMA/BN composites may offer new technology and business opportunities. POLYM. COMPOS., 36:1675–1684, 2015. © 2014 Society of Plastics Engineers
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Kang Zhang,Yan Wang,Yuling Xiao,Yapeng Zheng,Jingyi Lu,Chao Ma,Yuan Hu
A novel phosphorus/nitrogen-containing hyperbranched polyphenylphosphate (PHP) was synthesized and it was used with 3-isocyanatopropyltrimethoxysilane (ICPTMOS) to prepare transparent and flame retardant coating for poly(methyl methacrylate) (PMMA). The content of PHP and ICPTMOS was changed to investigate the influence of silicon content on the performance of PMMA coating complexes. All coated PMMA samples are highly transparent and the pencil hardness of coatings increases with the increment of silicon content. The cone calorimeter test results indicate that the relatively low silicon content in PMMA coatings is conducive to the simultaneous reduction of heat release and smoke production. Moreover, the coatings can effectively protect the PMMA matrix in fire and with only 3.2% PHP replaced by ICPTMOS (0.08 g) in coating formulation, the fire resistance time of corresponding coated PMMA sample is extended to 1500 s. This work provides a highly-efficient strategy to concurrently improve fire safety, transparency and hardness of coating.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 34
·期 2
·549-558
·
IF 3.348
Wang Xie,Yuan Liu,Mingming Yu,Qi Wang
The synthesis of intrinsic flame retardant copolymer by copolymerization with reactive flame retardants is the most potential method to prepare transparent and flame retardant poly (methyl methacrylate) (PMMA) at present，but the main challenge of this method is that the copolymer usually has poor mechanical properties and heat resistance. In this work, the hydrogen bond enhancement strategy is adopted, and the flame retardant PMMA with excellent comprehensive properties is obtained by ternary copolymerization with methyl methacrylate (MMA) as matrix unit, diethyl (methacryloyloxymethyl) phosphonate (DEP) as flame retardant unit and methacrylamide (MAA) as hydrogen bond unit. Due to the formation of intermolecular hydrogen bond via MAA unit, the storage modulus, flexural strength and impact strength of the terpolymer containing 15 mol% MAA are 48%, 19%, and 24% higher than those of the copolymer of MMA and DEP, and its hardness, glass transition temperature and load thermal deformation temperature (increased by 7°C) are also superior. Moreover, owing to the gas-phase dilution and charring flame retardancy of MAA unit, the terpolymer shows increased limiting oxygen index (24.3%) and UL94 rating (V-1). This work not only provides a promising flame retardant PMMA for practical application, but also offers a new strategy to design flame retardant polymers with good mechanical properties.
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
Nanomaterials
·
2023
·Vol. 13
·期 16
·2372
·
IF 5.3
Jiaming Wang,Li Zou,Meili Yang,Jiajie Cheng,Yufan Jiang,Guangdong Huang,Jingjing Dong
All-inorganic perovskite quantum dots (CsPbX3QDs) (X = Cl, Br, I) have the advantages of adjustable emission position, narrow emission spectrum, high fluorescence quantum efficiency (PLQY), easy preparation, and elevated defect tolerance; therefore, they are widely used in optoelectronic devices, such as solar cells, light-emitting diodes, and lasers. However, their stability still constrains their development due to their intrinsic crystal structure, ionic exchange of surface ligands, and exceptional sensitivity to environmental factors, such as light, water, oxygen, and heat. Therefore, in this paper, we investigate the stability improvement of CsPbX3QDs and apply fabricated high-efficiency, stable perovskite QDs to solar cells to improve the performance of the cells further. In this paper, we focus on CsPbBr3QDs with intrinsic extreme stability and optimize CsPbBr3QDs using strategies, such as Mn+doping, ligand regulation, and polymer encapsulation, which can improve optical properties while ensuring their stability. The test results show that the above five methods can improve the strength and luminescence performance of QDs, with the best stability achieved when PMMA encapsulates QDs with a ratio of PMMA = 2:1 and PLQY increases from 60.2% to 90.1%.Keywords:perovskite quantum dots;CsPbBr3;PMMA;optical properties;stability
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 5
·1-9
·
IF 1.615
Xue Sheng,Yang Haicun,Ma Wenzhong,Gong Fanghong,Tao Guoliang,Liu Chunlin,Pan Ji
Poly(methyl methacrylate) brushes grafted from attapulgite nanoparticles (ATP@PMMA) were prepared by R-Supported reversible addition-fragmentation chain transfer polymerization (RAFT). ATP was firstly activated, and allowed to react with γ-aminopropyltriethoxysilane (APTES), 4,4′-azobis(4-cyanovaleric acid) (ACVA) and bis(thiobenzoyl) disulfide stepwise to afford 4-cyanopentanoic acid dithiobenzoate functionalized ATP (ATP-CPADB). Then, RAFT polymerizations of MMA mediated by the different systems were conducted and compared systemically. The grafting process was verified by FTIR, XRD, XPS, TGA and TEM data. Kinetic behavior indicated that the anchored CPADB is more effective before diffusing into the bulk phase. The grafting ratio ( G
r ), while M
n of grafted and free polymer increased linearly with increasing monomer conversion in presence of free CPADB, giving the hybrid particles with more homogeneous distribution of grafted polymer layer.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Xiao Zhao,Qin Meng,Jiawei Liu,Qiju Li
In the present study, the combined miniemulsion and solvent evaporation (MESE) method was employed to encapsulate solvent black B (SOB) dye in poly (methyl methacrylate) (PMMA) to produce dye/polymer composite colorants . Using dynamic light scattering tests, the effect of the formulation variables on the size and size distribution of the prepared nanoparticles was examined. Transmission electron microscopy , UV–visible spectrophotometry , X-ray photoelectron spectroscopy , and elemental analysis results indicate that SOB was successfully encapsulated in the PMMA matrix using the MESE method. The resulting composite colorant could be dispersed in water. It also exhibited high light fastness and water-fastness.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Siqi Lu,Zixiang Zhao,Jinsen Han,Jun Wang,Yongxin Zhang,Yu Du,Fangyu Guo,Zhichao Wang,Shenghui Wang,Sichen Tang,Kuojuei Hu,Jianguo Wan,Jiayu Dai,Fengqi Song
Size-selected gas-phase aggregated metal clusters have long been considered as embryos of materials. However, a significant proportion of these clusters are susceptive to damage when exiting vacuum. Consequently, effective protection is highly desirable. Here a cluster packaging and protection strategy is presented based on controllable cluster beam implantation into polymethyl methacrylate (PMMA). In this strategy, the size selection of gas-phase clusters and the synergistic heating of PMMA during implantation are combined, thereby achieving nondestructive packaging of atomically precise cluster under soft-landing conditions. The packaged clusters exhibit robust and universal protection. Robustness is reflected in the unaltered oxidation resistance of Mo clusters after exposure to air for over 30 days, as well as the effective agglomeration resistance at temperatures up to 100 °C or in liquid. Universality is demonstrated by the successful protection of a wide range of size-selected clusters, including Mo clusters ranging from Mo 2057 to Mo 6 , and Ta 2057 , Cu 923 , W 55 , (Re–Mo) 147 clusters. This protection is attributed to both a stable, albeit weak PMMA-Mo bonding, forming Mo─O─C─C species that stabilize the clusters, and the direct implantation of gas-phase cluster into solid-phase PMMA. This helps pave the way for further investigation and applications of gas-phase metal clusters.
研究领域:
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Huimin Xue,Guidong Li,Lifei Liu,Tong Feng,Chun Li,Jiayang Sui,Weizhen Zhao
The stereochemistry of polymethyl methacrylate (PMMA) has a profound influence over its material properties; however, the pursuit of high tacticity in bulk free radical polymerization presents a formidable challenge. Consequently, the procurement of a methodology that facilitates the synthesis of highly tactic polymers during bulk free radical polymerization is both desirable and challenging. In this investigation, the propagation of methyl methacrylate (MMA) within an ionic liquids (ILs) medium was employed via bulk free radical polymerization to harness tacticity. The reactivity of polymerization and the propensity for isotactic polymer formation were potentiated by the incorporation of ILs, specifically 1-octyl-3-methylimidazolium hexafluorophosphate as an additive. The resultant polymer exhibited a triad isotacticity (mm) of 33%, achieved in the presence of a 5 wt% concentration of 1-octyl-3-methylimidazolium hexafluorophosphate. The isotactic selectivity of the ILs appeared to arise from their dynamic interplay with the monomeric or polymer chains, an interaction elucidated by 1 H NMR and DFT analyses. The research imparts critical understanding into the manipulation of PMMA tacticity and presents an enaging prospect for the production of highly tactic polymers via bulk free radical polymerization.
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 LUMINESCENCE
·
2021
·
IF 3.599
Mingrui Zhang,Feng Guo,Qingzhong Zhou,Tian Zhong,Biao Xiao,Liyong Zou,Qingliang You,Baogui You,Yang Li,Xueqing Liu,Hongjiao Liu,Jun Yan,Jiyan Liu
Device performance enhancement in quantum dot light-emitting diodes (QLEDs) is realized by adding a small amount of insulating polymer polymethyl methacrylate (PMMA) into the emitting quantum dot layer. Pool-Frenkel effect is observed through temperature-dependent current density-voltage experiments, indicating the important role of trap states, and the addition of the insulating PMMA helps to reduce the Poole-Frenkel barrier hence the trap depth. Reduced density and depth of trap states with PMMA are indeed observed through further capacitance measurements . This work contributes to a better understanding on the effects of traps in QLEDs.
研究领域:
材料科学
·
电子工程
✓ 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）