Specific heat of synthetic high polymers. XL the glass transition in isotactic polypropylene

2007 ◽  
Vol 6 (1) ◽  
pp. 149-155 ◽  
Author(s):  
Ismat Abu-Isa ◽  
V. A. Crawford ◽  
A. R. Haly ◽  
Malcolm Dole
Keyword(s):  
Glass Transition ◽  
Specific Heat ◽  
Isotactic Polypropylene ◽  
High Polymers

Effect of Ag andγ-ray irradiation on the specific heat of glass transition of Se78Te20Sn2glassy alloy

2019 ◽  
Vol 6 (9) ◽  
pp. 095201 ◽  
Author(s):  
Ankita Srivastava ◽  
Neeraj Mehta ◽  
John C MacDonald ◽  
Dipti Sharma
Keyword(s):  
Glass Transition ◽  
Specific Heat

Specific Heat of Synthetic High Polymers. IV. Polycaprolactam.

1955 ◽  
Vol 59 (10) ◽  
pp. 1015-1019 ◽  
Author(s):  
Paul Marx ◽  
C. W. Smith ◽  
A. E. Worthington ◽  
Malcolm Dole
Keyword(s):  
Specific Heat ◽  
High Polymers

Enthalpy Relaxation Near the Glass Transition of a Supercooled Liquid [Ca(NO 3) 2]0.4[KNO3]0.6

1995 ◽  
Vol 407 ◽  
Author(s):  
I. K. Moon ◽  
Yoon-Hee Jeong
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Specific Heat ◽  
Transition Region ◽  
Exponential Function ◽  
Supercooled Liquid ◽  
Frequency Range ◽  
Slow Dynamics ◽  
Glass Transition Region ◽  
Equilibrium Dynamics

ABSTRACTWe have investigated the slow dynamics in the glass transition region of a supercooled liquid [Ca(NO3)2]0.4[KN3]0.6 by measuring the dynamic specific heat in the frequency range from 0.01 Hz to 5 kHz. The equilibrium dynamics of the system in this range is well described by the stretched exponential function, exp[-(t/τ)β], and the Vogel-Fulcher type relaxation time, τ = τ0exp[Δ/(T − T0)].

Thermal Properties of PVP Cryoprotectants With Nanoparticles

2011 ◽  
Vol 2 (2) ◽  
Author(s):  
Baotong Hao ◽  
Baolin Liu
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Aqueous Solutions ◽  
Specific Heat ◽  
Warming Rate ◽  
The Difference ◽  
Transfer Properties

Vitrification is an effective way for the cryopreservation of cells and tissues. The critical cooling rates for vitrification solution are relatively high. It is reported that nanoparticles can improve the heat transfer properties of solutions. To increase the heat transfer coefficient of aqueous cryoprotectant solutions, Hydroxyapatite (HA) nanoparticles were added into Polyvinylpyrrolidone (PVP) solutions (50%, 55%, and 60%, w/w). The glass-transition temperature, devitrification temperature, and specific heat of PVP aqueous solutions with/without HA nanoparticles (0.1%, 0.5%, and 1%, w/w) were measured by a differential scanning calorimeter at a cooling rate of 20°C/min and a warming rate of 10°C/min. The change in density of the above solutions with temperature was determined by using a straw that can reveal the volume change of solutions. The thermal conductivity was calculated based on the experimental data. A device that can be used to measure the thermal conductivity of vitrification solutions with/without nanoparticles was developed in this study. The results showed that the glass-transition temperature, devitrification temperature, and specific heat of PVP aqueous solutions with HA nanoparticles are larger than those without HA nanoparticles. The thermal conductivity of solutions with HA nanoparticles is larger than those without HA nanoparticles at a specific temperature. The lower the temperature, the smaller the difference in thermal conductivity between the solutions with and without HA nanoparticles. The calculated thermal conductivity meets the measured data well.

Specific heat anomaly at the glass transition

2002 ◽  
Vol 117 (22) ◽  
pp. 10151-10155 ◽  
Author(s):  
Takashi Odagaki ◽  
Takashi Yoshidome ◽  
Toshiaki Tao ◽  
Akira Yoshimori
Keyword(s):  
Glass Transition ◽  
Specific Heat
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