Specific Heat of Synthetic High Polymers. VI. A Study of the Glass Transition in Polyvinyl Chloride

1955 ◽  
Vol 77 (18) ◽  
pp. 4774-4777 ◽  
Author(s):  
Saul Alford ◽  
Malcolm Dole
Keyword(s):  
Glass Transition ◽  
Specific Heat ◽  
Polyvinyl Chloride ◽  
High Polymers

Ionic Jump Distance and Glass Transition of Polyvinyl Chloride

1971 ◽  
Vol 42 (9) ◽  
pp. 3388-3392 ◽  
Author(s):  
Masamitsu Kosaki ◽  
Koichi Sugiyama ◽  
Masayuki Ieda
Keyword(s):  
Glass Transition ◽  
Polyvinyl Chloride ◽  
Jump Distance

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)].

Plasticizers in Rubbers and Plastics

1947 ◽  
Vol 20 (1) ◽  
pp. 184-206 ◽  
Author(s):  
H. Jones
Keyword(s):  
Polyvinyl Chloride ◽  
Polyvinyl Acetate ◽  
Polymer System ◽  
Amorphous Polymers ◽  
Chemical Processing ◽  
Cellulose Derivatives ◽  
New Materials ◽  
Chemical Action ◽  
The Subject ◽  
High Polymers

Abstract Up to the advent of synthetic high polymers, plasticizer technology was little understood, Plasticizers had been used mainly with cellulose derivatives, which are not at all good materials for the study of plasticizer action. The chemical processing they undergo, e.g., nitration, acetylation, etc., leads to variations on account of irregular chemical action. In addition, these materials are partly crystalline and partly amorphous. The growing numbers of new materials brought a host of problems in their train, and plasticizing was not the least of them, but a study of their behavior with plasticizers has advanced the knowledge of the plasticizer-polymer system. The principal advances have come from a study of regular and amorphous polymers, such as polyvinyl chloride, polyvinyl acetate, polystyrene, butadiene rubbers, and so on. From knowledge of these materials, one can revert to the consideration of irregular polymers such as cellulose derivatives and those produced from high polymers by additional chemical reaction, with a better likelihood of understanding their behavior with plasticizers. Thus the recent extensive use of plasticizers has led to an improved understanding of their action, and it appeared that a paper dealing with the subject might be acceptable.

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.

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