This observation can be interpreted by a massive change of the phonon spectra of the melting solids in addition to the decomposition into mixing units. Upon cooling the melt below the glass transition temperature, Tg, the mixed decomposition products of the melt are frozen in. This frozen-in ...
the extrapolation of the DSC curve to lower temperature from the melt (above 70 °C) was used as the baseline for the melting peak. This curve also corresponds to the tangent for the glass transition evaluation.
Between 240 K and the glass transition temperature T g (419-430 K depending on crystallization conditions) the amorphous solid has a slightly higher C p. Above T g poorly crystallized samples show a rigid-amorphous fraction that does not contribute to the increase in C p at T g. ...
The glass transition temperature of PTMMS is -52 掳C, but no melting temperature was detected by DSC. TGA measurements revealed excellent high-temperature properties under nitrogen or air. Random copolymers of tetramethyl-p-silphenylene-... R Zhang 被引量: 0发表: 1999年 EFFECT OF ACID AND AL...
Thermal expansion and the glass transition Melting is well understood in terms of the Lindemann criterion, essentially stating that crystalline materials melt when the thermal vibrations of their atoms become such vigorous that they shake themselves free of the binding forces. Ho... P Lunkenheimer,A...
1). On the other hand, both components exhibit high structural degrees of freedom which substantially increases the configurational entropy and hence reduce the glass transition (Tg) and melting temperatures (Tm)27. UiO-67, UiO-68 and DUT-5 are exemplified because they are prototypical MOFs ...
12.6 GLASS TRANSITION TEMPERATURE Metal acrylic acid complexes were grafted, in the presence of dicumyl peroxide used as a free radical initiator, onto polypropylene. The glass transition temperature, Tg, and the melting temperature, Tm, were affected by the metal used.1 Only copper causes a decre...
“rubbery” state as the temperature increases. The corresponding transition temperature from “glassy” to “rubbery” or vice versa is called theglass transition temperature(Tg), which is always lower than the melting temperature (Tm) of thecrystalline stateof the material (if the material has ...
The glass transition temperature (Tg) is a key property that dictates the applicability of conjugated polymers. The Tg demarks the transition into a brittle glassy state, making its accurate prediction for conjugated polymers crucial for the design of so
An adhesive structure used to join the cap on the substrate includes a high-glass-transition-point adhesive partially coated on the cap bonded portion of the substrate, and a low-glass-transition-point adhesive coated over an entire periphery of the opening of the cap. The opening of the cap...