The effect of thermal stress on the thermal expansion coefficient and glass transition temperature of glass fiber–polymer composites

1977 ◽  
Vol 15 (9) ◽  
pp. 1557-1568 ◽  
Author(s):  
T. Kajiyama ◽  
T. Yoshinaga ◽  
M. Takayanagi
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Thermal Stress ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Glass Fiber ◽  
Polymer Composites ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient

The Effect of CaO and MgO on Physical Properties of MgO-CaO-B2O3-Al2O3-SiO2 Glasses with Composition Close to the E-Glass Fibers

2008 ◽  
Vol 39-40 ◽  
pp. 81-84 ◽  
Author(s):  
J. Kraxner ◽  
R. Klement ◽  
Mária Chromčíková ◽  
Marek Liška
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Physical Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Glass Fibers ◽  
Flow Activation Energy ◽  
Flow Activation

High temperature viscosity and density of glass melts, glass transition temperature, and thermal expansion coefficient of glasses from the system MgO-CaO-B2O3-Al2O3-SiO2 with composition close to the E-glass were measured and interpreted with respect to the effect of CaO and MgO content on their physical properties. The Andrade model was applied for description of the temperature dependence of the glass viscosity within studied temperature range. The regression formaulae describing the compositional dependence of the viscosity points T2 = T( η = 100 dPa.s), T3 = T( η = 1000 dPa.s), the glass transition temperature, Tg, thermal expansion coefficient of glass, αg , and of the viscous flow activation energy, Ea, were proposed.

Highly transparent polyhydroxyimide/TiO2 and ZrO2 hybrid films with high glass transition temperature (Tg) and low coefficient of thermal expansion (CTE) for optoelectronic application

2017 ◽  
Vol 5 (33) ◽  
pp. 8444-8453 ◽  
Author(s):  
Shun-Wen Cheng ◽  
Tzu-Tien Huang ◽  
Chia-Liang Tsai ◽  
Guey-Sheng Liou
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Expansion Coefficient ◽  
Coefficient Of Thermal Expansion ◽  
High Glass Transition Temperature ◽  
Hybrid Films ◽  
Optoelectronic Application ◽  
Low Thermal Expansion

Highly transparent polyhydroxyimide/TiO2 and ZrO2 hybrids films with high glass transition temperature and low thermal expansion coefficient for optoelectronic application.

Thermal Relaxations of Polymers Revealed by Reversing and Non-Reversing Coefficient of Thermal Expansion

2010 ◽  
Vol 123-125 ◽  
pp. 451-454
Author(s):  
Robert A. Shanks
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Expansion Coefficient ◽  
Structural Changes ◽  
Coefficient Of Thermal Expansion ◽  
Modulated Temperature ◽  
Heating And Cooling ◽  
Modulated Temperature Dsc

Reversible and irreversible events can be resolved) using modulated temperature DSC and TMA. Each technique has advantages, those for TMA include longer times and slower scan rates that allow greater approach to material equilibrium. The thermal expansion coefficient and glass transition temperature can be isolated from relaxations and structural changes. Modulated temperature thermomechanometry (mT-TM) is used to characterize amorphous thermoplastics including PS, PMMA, PC and PPO, and the results including annealing, heating and cooling.

Nonlinear thermal expansion and contraction of asphalt concrete

1999 ◽  
Vol 26 (1) ◽  
pp. 26-34 ◽  
Author(s):  
Menglan Zeng ◽  
Donald H Shields
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Thermal Stress ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Viscoelastic Material ◽  
Asphalt Concrete ◽  
Nonlinear Function ◽  
Single Type ◽  
Thermal Coefficient

Asphalt concrete for paving roads is a viscoelastic material. In the prediction of thermal stress in asphalt pavements, the thermal expansion-contraction property of the material is required. In current practice, thermal expansion-contraction is assumed to be a linear function of temperature, and a constant thermal coefficient is used. The fact that a viscoelastic material may have a glass transition temperature and the thermal property may have a discontinuity at the glass transition temperature has not been considered. This study investigates the thermal nonlinearity of asphalt concrete. In this research, the thermal expansion-contraction was continuously measured on a single type of asphalt concrete in the temperature range from +40°C to -40°C. It was found that the thermal expansion-contraction was a continuous nonlinear function of temperature, resulting in a variable thermal coefficient. Evaluations of the effect of the nonlinearity indicated that the assumption of thermal linearity can result in moderate errors in stress prediction in asphalt pavements.Key words: asphalt concrete, thermal expansion-contraction, thermal coefficient, nonlinear thermal behaviour, asphalt pavement, thermal stress.

scholarly journals Out-of-Plane Thermal Expansion Coefficient and Biaxial Young’s Modulus of Sputtered ITO Thin Films

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 153
Author(s):  
Chuen-Lin Tien ◽  
Tsai-Wei Lin
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Thermal Stress ◽  
Young’S Modulus ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Young's Modulus ◽  
Heating Temperature ◽  
Glass Substrates ◽  
Ito Thin Films

This paper proposes a measuring apparatus and method for simultaneous determination of the thermal expansion coefficient and biaxial Young’s modulus of indium tin oxide (ITO) thin films. ITO thin films simultaneously coated on N-BK7 and S-TIM35 glass substrates were prepared by direct current (DC) magnetron sputtering deposition. The thermo-mechanical parameters of ITO thin films were investigated experimentally. Thermal stress in sputtered ITO films was evaluated by an improved Twyman–Green interferometer associated with wavelet transform at different temperatures. When the heating temperature increased from 30 °C to 100 °C, the tensile thermal stress of ITO thin films increased. The increase in substrate temperature led to the decrease of total residual stress deposited on two glass substrates. A linear relationship between the thermal stress and substrate heating temperature was found. The thermal expansion coefficient and biaxial Young’s modulus of the films were measured by the double substrate method. The results show that the out of plane thermal expansion coefficient and biaxial Young’s modulus of the ITO film were 5.81 × 10−6 °C−1 and 475 GPa.

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