Effect of surfactant and electron treatment on the electrical and thermal conductivity as well as thermal and mechanical properties of ethylene vinyl acetate/expanded graphite composites

2015 ◽  
Vol 132 (32) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jeremia Shale Sefadi ◽  
Adriaan Stephanus Luyt ◽  
Jürgen Pionteck ◽  
Francesco Piana ◽  
Uwe Gohs
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Vinyl Acetate ◽  
Expanded Graphite ◽  
Ethylene Vinyl Acetate ◽  
Thermal And Mechanical Properties ◽  
Graphite Composites

scholarly journals Thermal and Mechanical Properties of Expanded Graphite/Paraffin Gypsum-Based Composite Material Reinforced by Carbon Fiber

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2205 ◽  
Author(s):  
Bo Zhang ◽  
Yuanyuan Tian ◽  
Xiaoyan Jin ◽  
Tommy Lo ◽  
Hongzhi Cui
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Composite Material ◽  
Energy Storage ◽  
Carbon Fiber ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Expanded Graphite ◽  
Building Envelope ◽  
Thermal And Mechanical Properties

Phase change material (PCM) is a kind of thermal energy storage material. Solid-liquid PCM composite materials must overcome the issues of material leakage and low thermal conductivity before they are suitable for widespread use in the fields of building and industry. In this study, porous expanded graphite (EG) is used as a carrier, which absorbs the PCM to fabricate EG/paraffin composites (EG/P) containing 90.6% paraffin, and a latent heat of up to 105.3 J/g was measured. Because gypsum board is widely used in buildings, therefore, EG/P composites are suitable to be integrated into gypsum to develop expanded graphite/paraffin gypsum-based composite material (EGPG) for thermal energy storage. In order to optimize the performance of EGPG, carbon fiber (CF) is used to reinforce their thermal and mechanical properties. The test results show that when 1 wt % CF is incorporated into the EGPG, the thermal conductivity increased 36.0%, and thus EGPG shows superior thermal control through the significantly increased efficiency of heat transfer. After 1 wt % CF was added, the flexural and compressive strength of EGPG were increased by 65.6% and 6.4%, respectively. The improved thermal and mechanical performance of EGPG modified by CF demonstrates that it is a structural-functional integrated building material suitable for building envelope system.

Effect of electron beam irradiation on the thermal and mechanical properties of ethylene-vinyl acetate copolymer/polyamide blends

2020 ◽  
pp. 096739112093010
Author(s):  
Jawad Ahmed ◽  
Yong Zhang
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Vinyl Acetate ◽  
Irradiation Dose ◽  
Ethylene Vinyl Acetate ◽  
Cross Linking ◽  
Thermal And Mechanical Properties ◽  
Beam Irradiation ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

The effect of electron beam (e-beam) irradiation on the thermal and mechanical properties of ethylene-vinyl acetate copolymer/ternary polyamide (EVA/tPA) blends was studied. The e-beam irradiation was carried out over a range of dose from 50 kGy to 500 kGy with trimethylolpropane trimethacrylate (TMPTMA) and triallyl isocyanurate (TAIC) as cross-linking coagents. With increasing irradiation dose, the gel fraction of the EVA/tPA blends increased significantly. After irradiated by e-beam at 500 kGy, the insoluble fraction of EVA/tPA blends with 3 parts per hundred rubber TMPTMA increased from 28% to 86%. The tensile strength of EVA/tPA/TMPTMA-3 (70/30/3) considerably increased up to 172% with a value of 10.01 MPa at 500 kGy due to an increase in cross-linking compared to the EVA/tPA/TAIC-3 (70/30/3) blend. However, the melting temperature and crystallization peak temperature of EVA/tPA blends decreased with increasing irradiation dose. Thermogravimetric analysis demonstrated that the irradiation cross-linking could improve the thermal stability of the EVA/tPA blends. The degradation kinetics of the EVA/tPA blends at elevated temperatures were studied using the Kissinger, Flynn–Wall–Ozawa, and Friedman methods. Irradiation cross-linked EVA/tPA blends exhibited a remarkable improvement in their oil resistance, with the identified improvement being most prominent in the EVA/tPA/TMPTMA-3 blend.

Influence of Submicron Alumina on Thermal Conductivity of the Filled EVA Encapsulant

2010 ◽  
Vol 143-144 ◽  
pp. 1454-1458
Author(s):  
Ming Xia Shen ◽  
Yin Xin Cui ◽  
Yao Ming Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Surface Properties ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Scattering Method ◽  
Particle Sizes ◽  
Laser Scattering ◽  
Volume Fractions ◽  
Eva Copolymer

An elastic co-film with excellent mechanical properties and adhesiveness, as well as good thermal conductivity, was fabricated based on the composition of a thermal-conductive alumina and ethylene vinyl acetate (EVA) copolymer. Thermal conductivity of the co-films with various particle sizes, amount, surface properties, and so on of alumina were investigated by the laser scattering method. The SEM results showed that the co-film with 16% (volume fractions) of submicron alumina in EVA copolymer had a good interface binding.

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