scholarly journals Thermomechanical investigation on the effect of nitroguanidine on the thermal expansion coefficient and glass transition temperature of double-base gun propellant

2019 ◽  
Vol 8 (5) ◽  
pp. 4264-4272 ◽  
Author(s):  
Le Qi ◽  
Zhongliang Ma ◽  
Jiahao Liang ◽  
Zhongliang Xiao ◽  
Mengyao Dong ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Double Base

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.

The Effect of Thermal History on Porcelain Expansion Behavior

1989 ◽  
Vol 68 (9) ◽  
pp. 1313-1315 ◽  
Author(s):  
C.W. Fairhurst ◽  
D.T. Hashinger ◽  
S.W. Twiggs
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Heating Rate ◽  
Room Temperature ◽  
Heating Rates ◽  
Thermal Expansion Data ◽  
Temperature Range ◽  
Expansion Behavior

Porcelain-fused-to-metal restorations are fired several hundred degrees above the glass-transition temperature and cooled rapidly through the glass-transition temperature range. Thermal expansion data from room temperature to above the glass-transition temperature range are important for the thermal expansion of the porcelain to be matched to the alloy. The effect of heating rate during measurement of thermal expansion was determined for NBS SRM 710 glass and four commercial opaque and body porcelain products. Thermal expansion data were obtained at heating rates of from 3 to 30°C/min after the porcelain was cooled at the same rate. By use of the Moynihan equation (where Tg systematically increases in temperature with an increase in cooling/heating rate), the glass-transition temperatures (Tg) derived from these data were shown to be related to the heating rate.

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