Analysis of relaxation on polypropyleneglycols above vitrification temperature

2009 ◽  
Vol 50 (5) ◽  
pp. 930-942 ◽  
Author(s):  
T. M. Usacheva ◽  
N. V. Lifanova ◽  
V. I. Zhuravlev ◽  
V. K. Matveev
Keyword(s):  
Vitrification Temperature

Estimation of Firing Temperature and Compositional Variability of Archaeological Pottery by Differential Scanning Calorimetry

2004 ◽  
Vol 852 ◽  
Author(s):  
A. Giordana ◽  
E. Peacock ◽  
M. McCarthy ◽  
K. Guilbeau ◽  
P. Jacobs ◽  
...  
Keyword(s):  
Firing Temperature ◽  
Thermal Characterization ◽  
Small Sample ◽  
Scanning Calorimetry ◽  
Blind Test ◽  
Vitrification Temperature ◽  
Archaeological Pottery ◽  
Digital Scanning ◽  
Different Temperatures ◽  
Upper Estimate

ABSTRACTDigital Scanning Calorimetry (DSC), a thermal characterization technique, can be used to rapidly obtain a rough upper estimate of the firing temperature of archaeological pottery as well as an indication of its composition. The technique involves heating a small sample (10–20 mg) of ground ceramic above the vitrification temperature, cooling and reheating. The curves of the two heating cycles are then compared. The validity of the technique was evaluated by a blind test in which 35 tiles fired at different temperatures were analyzed without knowing their firing point, and by analysis of archaeological pottery samples assumed to be local or imported based upon stylistic criteria.

Temperatures of Vitrification and Fluidity of Natural Rubber of Different Molecular Weights

1956 ◽  
Vol 29 (1) ◽  
pp. 95-98
Author(s):  
A. Tager ◽  
M. Iovlova ◽  
T. Kantor ◽  
L. Muzheva
Keyword(s):  
Molecular Weight ◽  
Natural Rubber ◽  
Vitrification Temperature ◽  
Molecular Weights

Abstract The vitrification temperature of natural rubbers does not change with change of molecular weight, whereas the higher the molecular weight of the rubber, the higher is its fluidity temperature.

Mechanical Method of Determination of the Vitrification Temperature of Rubberlike Polymers

1956 ◽  
Vol 29 (4) ◽  
pp. 1174-1180
Author(s):  
A. I. Marei
Keyword(s):  
Temperature Region ◽  
Constant Stress ◽  
Mechanical Method ◽  
Vitrification Temperature ◽  
Method Of Determination ◽  
Compression Deformation

Abstract 1. A mechanical method has been developed for the determination of the vitrification temperature of rubberlike polymers, based on measurement of the compression deformation of polymer samples in the vitrification temperature region under a constant stress. 2. An apparatus for the determination of the vitrification temperature of polymers by the mechanical method is described. 3. The vitrification temperatures of a series of polymers have been determined. The agreement of results of the determination of the vitrification temperature of the polymers by mechanical and by other methods is shown.

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