Synthesis and morphology control of nano-scaled magnesium hydroxide and its influence on the mechanical property and flame retardancy of polyvinyl alcohol

2019 ◽  
Vol 9 (6) ◽  
pp. 675-680
Author(s):  
Xiaodong Wang ◽  
Mingqing Yu ◽  
Lei Li ◽  
Xu Fan
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Reaction Time ◽  
Polyvinyl Alcohol ◽  
Composite Film ◽  
Magnesium Hydroxide ◽  
Flame Retardancy ◽  
Nanocomposite Film ◽  
Room Temperature ◽  
Precipitation Reaction

Nano-scaled magnesium hydroxide with the special appearance was synthesized by a water precipitation reaction at room temperature. The effects of surfactant, reaction time, reactant concentration on the morphology of nano-scaled magnesium hydroxide were investigated. The nanocomposite film was prepared by adding nano-sized magnesium hydroxide to polyvinyl alcohol. The mechanical property and flame retardancy of PVA nanocomposites were tested. The results showed that the mechanical properties and flame retardancy of the composite film were improved by adding nano-powders.

Microstructure and Mechanical Properties of Mg-RE-B Alloys

2011 ◽  
Vol 311-313 ◽  
pp. 2251-2254
Author(s):  
Le Ping Bu ◽  
Qing Tai Shen ◽  
Pei Wu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Room Temperature ◽  
Tensile Yield Strength ◽  
Ingot Metallurgy ◽  
Particle Structure ◽  
Promising Candidate ◽  
Excellent Mechanical Property ◽  
Before And After ◽  
Microstructure And Mechanical Property

The best is to read these instructions and follow the outline of this text. Mg-RE-B alloy with minuteness particle structure (MPS) were prepared by ingot metallurgy including as-cast and hot-extruded processing, and the microstructure and mechanical property of Mg-6RE-3B2O3 (wt%) alloys were investigated before and after hot-extruded. The Mg-RE-B alloy has satisfied grain size and particle structure, went with excellent mechanical property of tensile yield strength of 520 MPa and elongation of 5% at room temperature. The MPS Mg-RE-B alloy is a promising candidate among lightweight structural materials

Novel nanocomposites based on epoxy resin and modified magnesium hydroxide: Focus on flame retardancy and mechanical properties

2019 ◽  
Vol 30 (12) ◽  
pp. 3026-3037
Author(s):  
Xinyao Lv ◽  
Hui Fan ◽  
Wei Zeng ◽  
Zhiwang Yang ◽  
Yun Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Magnesium Hydroxide ◽  
Flame Retardancy

scholarly journals Polydopamine-Based Surface Modification of ZnO Nanoparticles on Sericin/Polyvinyl Alcohol Composite Film for Antibacterial Application

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 503 ◽  
Author(s):  
Lisha Ai ◽  
Yejing Wang ◽  
Gang Tao ◽  
Ping Zhao ◽  
Ahmad Umar ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Antibacterial Activity ◽  
Polyvinyl Alcohol ◽  
Composite Film ◽  
Performance Test ◽  
Mechanical Performance ◽  
Wound Dressings ◽  
Zno Nps ◽  
Water Contact ◽  
Loss Analysis

Silk sericin (SS) is a type of natural macromolecular protein with excellent hydrophilicity, biocompatibility and biodegradability, but also has very poor mechanical properties. To develop sericin-based wound dressings, we utilized polyvinyl alcohol (PVA) to reinforce the mechanical property of sericin by blending PVA and sericin, then modified zinc oxide nanoparticles (ZnO NPs) on SS/PVA film with the assistance of polydopamine (PDA) to endow SS/PVA film with antibacterial activity. Scanning electron microscopy, energy dispersive spectroscopy and X-ray powder diffraction demonstrated ZnO NPs were well grafted on PDA-SS/PVA film. Fourier transform infrared spectra suggested PDA coating and ZnONPs modification did not alter the structure of sericin and PVA. Water contact angle and swelling tests indicated the excellent hydrophilicity and swellability of ZnO NPs-PDA-SS/PVA composite film. Mass loss analysis showed ZnO NPs-PDA-SS/PVA film had excellent stability. The mechanical performance test suggested the improved tensile strength and elongation at break could meet the requirement of ZnO NPs-PDA-SS/PVA film in biomaterial applications. The antibacterial assay suggested the prepared ZnO NPs-PDA-SS/PVA composite film had a degree of antimicrobial activity against Escherichia coli and Staphylococcus aureus. The excellent hydrophilicity, swellability, stability, mechanical property and antibacterial activity greatly promote the possibility of ZnO NPs-PDA-SS/PVA composite film in antibacterial biomaterials application.

Polyvinyl alcohol-graphene oxide nanocomposites: evaluation of flame-retardancy, thermal and mechanical properties

2019 ◽  
Vol 57 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Mostafa Zamani ◽  
Elham Gholibegloo ◽  
Mozhgan Aghajanzadeh ◽  
Fatemeh Salehian ◽  
Seyed Esmaeil Sadat Ebrahimi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Flame Retardancy ◽  
Thermal And Mechanical Properties

scholarly journals Preparation of polyaniline-polyvinyl alcohol-silver nanocomposite and characterization of its mechanical and antibacterial properties

2018 ◽  
Vol 25 (5) ◽  
pp. 975-982 ◽  
Author(s):  
Alireza Khoshkbar Sadeghi ◽  
Maryam Farbodi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polyvinyl Alcohol ◽  
Nanocomposite Film ◽  
Antibacterial Properties ◽  
Composition And Structure ◽  
Reinforcing Agent ◽  
Silver Nanocomposite ◽  
Thermal Stability Of

AbstractIn the present research, polyaniline is used as a conducting polymer and polyvinyl alcohol is also used as a biopolymer, because of its mechanical properties and suitable processability. Also, silver nanoparticles are considered as a reinforcing agent of thermal stability, mechanical and antibacterial properties to prepare polyaniline-polyvinyl alcohol-silver nanocomposite. The synthesis of polyaniline-polyvinyl alcohol composite and polyaniline-polyvinyl alcohol-silver nanocomposite is performed through addition of polyaniline and silver in polyvinyl alcohol solution. In order to review thermal, mechanical and antibacterial properties of synthesized composite and nanocomposites, components with different weight rates are used. The obtained results from thermogravimetric analysis (TGA) tests also indicate promotion of thermal stability of polyaniline-polyvinyl alcohol-silver nanocomposite compared with pure polyvinyl alcohol in temperatures above 400°C. The results of Fourier-transform infrared (FTIR) spectroscopy revealed the presence of polyaniline, polyvinyl alcohol and silver in the structure of polyaniline-polyvinyl alcohol-silver triple nanocomposite film. The obtained results from a review of antibacterial properties showed that polyaniline-polyvinyl alcohol-silver nanocomposites have antibacterial effects on two different types of Gram-positive and Gram-negative bacteria. The obtained results from a review of mechanical properties of nanocomposites showed that the greatest value of tensile strength (13.8 MPa) belonged to polyaniline-polyvinyl alcohol-silver (88%/9%/3% w/w) nanocomposites. Therefore, this is determined as an optimal triple nanocomposite. In addition, scanning electron microscopy (SEM) coupled with an energy dispersive X-ray (EDX) system was used to characterize the composition and structure of polyaniline-polyvinyl alcohol-silver nanocomposite film.

Synthesis and Characterization of a Flame Retardant Dimethyl Methyl Phosphonate (DMMP) and its Application in FRP

2013 ◽  
Vol 804 ◽  
pp. 29-35
Author(s):  
Zhu Wang ◽  
Shan Jun Gao ◽  
Xu Xin Che ◽  
Chun Hui Shen
Keyword(s):  
Mechanical Properties ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Flame Retardancy ◽  
Normal Pressure ◽  
Stability Control ◽  
Limiting Oxygen Index ◽  
Frp Composites ◽  
Preparation Conditions ◽  
Catalyst Dosage

Dimethyl Methyl Phosphonate (DMMP) was synthesized via the MichaelisArbuzov rearrangement in the normal pressure and N2atmosphere using a novel and can be used repeatedly catalyst. The preparation conditions of DMMP, such as the reaction time, reaction temperature and catalyst dosage were investigated. The FTIR (Fourier transform infrared spectroscopy), NMR (Nuclear magnetic resonance) , and TG-DSC(Thermogravimetric-Dynamic stability control system) results show that the obtained product is DMMP. When the reaction temperature is higher than 180°C, catalyst dosage is 12 wt%, and the reaction time is about 13 h, the highest yield (78 wt%) of DMMP can be obtained. Then DMMP was added to a FRP (Fiber Reinforced Plastics) matrix. The flame retardancy and mechanical properties of the DMMP/ FRP were tested for Limiting Oxygen Index (LOI), breaking elongation, impact toughness, tensile, and flexural strengths. A significant improvement of flame retardancy of the system was observed (increase of LOI up to 30.4) with an addition of 10 wt% DMMP to FRP. But when the DMMP content in the DMMP/ FRP composites is more than 10 wt%, the comprehensive mechanical properties of FRP will appear to decline and the LOI value has not changed, so we conclude that DMMP content in the DMMP/ FRP composites is 10wt%.

Effect of Y on Microstructure and Mechanical Properties of Mg-6Al-1Zn-1.8Gd Magnesium Alloy

2014 ◽  
Vol 1035 ◽  
pp. 303-306
Author(s):  
Xiao Ya Chen ◽  
Quan An Li ◽  
Qing Zhang ◽  
Jun Chen ◽  
Hui Zhen Jiang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
High Temperature ◽  
Room Temperature ◽  
Tensile Tests ◽  
High Mechanical Property ◽  
Microstructure And Mechanical Properties ◽  
Micro Analysis ◽  
Very High

The microstructure and mechanical properties of Mg-6Al-1Zn-0.9Y-1.8Gd alloy have been studied by micro-analysis and tensile tests. The results showed that the alloy mainly consists of Mg matrix, Al2Y, Mg17Al12and Al2Gd. The best tensile strength of the alloy was 255 Mpa at room temperature, and the alloy still had the very high mechanical property at high temperature.

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