Derivation of Accurate Glass Transition Temperatures by Differential Scanning Calorimetry

1976 ◽  
Vol 49 (2) ◽  
pp. 224-232
Author(s):  
M. J. Richardson ◽  
N. G. Savill
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Quantitative Data ◽  
Transition Temperatures ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Heat Increment ◽  
Rate Of Cooling ◽  
Kinetic Effects ◽  
Dsc Curves

Abstract Glass transition temperatures, Tg, cannot be directly determined from differential scanning calorimetry (DSC) curves because of kinetic effects which are especially serious for well annealed samples. Using an anionic polystyrene as an example it is shown how DSC data can be transformed to enthalpy curves which give Tg with an accuracy of ±1 K. As the rate of cooling through the glassy region is lowered, Tg is found to decrease by 2.2 K per decade decrease in cooling rate. Quantitative data are given for the specific heat increment at Tg.

Synthesis and Properties of Poly (N-arylenebenzimidazole ketone)s

2014 ◽  
Vol 881-883 ◽  
pp. 165-168
Author(s):  
Xiang Wang Cui ◽  
Lin Zhang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Coupling Reaction ◽  
Transition Temperatures ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures

Two bis (benzimidazoyl) monomers were synthesized, and Poly (N-arylenebenzimidazole ketone) s were prepared by N-C coupling reaction that replaced the NH sites from the bis (benzimidazolyl) derivatives with activated difluorides monomers in sulfolane at 210 °C. All the resulting polymers showed easy solubility compared with traditional polybenzimidazoles. Differential scanning calorimetry and thermogravimetric measurements showed that the polymers had high glass transition temperatures (>240 °C), good thermostability and high decomposition temperatures (>460 °C).

Glass Transition Behavior of Polyisoprene: The Influence of Molecular Weight, Terminal Hydroxy Groups, Microstructure, and Chain Branching

1982 ◽  
Vol 55 (1) ◽  
pp. 245-252 ◽  
Author(s):  
C. Kow ◽  
M. Morton ◽  
L. J. Fetters ◽  
N. Hadjichristidis
Keyword(s):  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Low Molecular Weight ◽  
Hydroxyl Groups ◽  
Transition Temperatures ◽  
Scanning Calorimetry ◽  
Chain Branching ◽  
Glass Transition Temperatures ◽  
Hydroxy Groups

Abstract The glass transition temperatures for a series of high-1,4 linear and star-branched polyisoprenes have been measured by differential scanning calorimetry. The Fox-Flory relation for the linear polyisoprenes was found to be Tg=Tg∞−1.76×104Mn−1. The influence of hydroxyl groups on Tg was also examined for low molecular weight (<2.2×104) polyisoprenes.

Sign in / Sign up

Export Citation Format

Share Document