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the specific heat difference Δ C p m among the undercooled liquid and the corresponding solid phases and the characteristic temperatures T m , T g , and the ideal glass transition temperature T K . In view of these facts, it can be realized that R
of 293 K min −1 . The test was performed on Perkin Elmer Diamond TG/DTA instrument. The glass transition temperatures of pure polymers and nanocomposites were characterized by DSC (Netzsch DSC 204). All measurements on DSC were performed using
polymers . Thermochim Acta . 1996 ; 272 : 125 – 129 . 10.1016/0040-6031(95)02622-3 . 6. Hutchinson , J . Determination of the glass transition temperature . J Therm Anal Cal . 2009 ; 98
generally used to study the crystallization kinetics. In this study, the thermal stability of Sb x Ge 25− x Se 75 (0 ≤ x ≤ 10), glasses has been discussed based on characteristic temperatures such as the glass transition temperature, T g , the
Abstract
Alkali phosphomolybdate glasses have been prepared by quenching melted mixtures of P2O5, MoO3 and A2O(A=Li, Na). The composition dependence of the transition temperature of glasses belonging to ternary A2O–(MoO3)2–P2O5 (A=Li, Na) systems is studied for several series of glasses corresponding to either a fixed A2O rate or a constant Mo/P ratio. The interpretation of the results is based on the presence of different types of molybdenum and phosphorous structural groups and P–O–M (M=P, Mo) linkages in glasses.
binary MoO 3 –P 2 O 5 and ternary K 2 O–MoO 3 –P 2 O 5 systems generally have low melting temperature, high thermal expansion coefficient, low glass transition temperature but their chemical durability is poor in comparison with commercial silicate
amount of unreacted DGEBA intragallery coincides with the excess of DGEBA in r = 0.85. The glass transition temperature of the neat epoxy thermosets reaches a maximum at r = 1, but the nanocomposites show the maximum at r ~ 0.9, this is
-crystallization of PMP at same heating rate above the second glass transition temperature of PMP in ‘semi-ordered’ phases made the X c almost no change. Non-isothermal crystallization kinetics The modified Avrami analysis
the polymer chain and is associated to the glass transition temperature ( T g ). Most of the systems studied show changes in the position of tan δ, corresponding to the α-relaxations of the phases, which are attributed to a partial miscibility of the
shown that the extent of crosslinking of a polymer may be assessed by measurements of the glass transition temperature ( T g ). T g is an important parameter for polymer characterization as it marks a region of dramatic changes in the physical
