Both the glass transition temperature and the melting point of poly(vinyl chloride have been found to increase as the temperature at which the ample is polymerized is decreased). The glass transition temperature changes from about 70°C. for polymer prepared at 125°C. to about 100°C. for ...
The ratio Tg/Tm is equal to 0.66, in accordance with the so-called -rule between the glass transition temperature (Tg) and the melting point (Tm) of many polymers. The coefficients of linear thermal expansion, below and above Tg... Y Araki - 《Journal of Applied Polymer Science》 被引...
b Transition of crystalline ZW-UiO-67·HA to glassy agZW-UiO-67·HA, then back to crystalline agrZW-UiO-67·HA through melting, quenching and solvent stimulation processes. The purple sphere and gray bond denote the Zr6O4(OH)4 node and BPDC-MIMS linker (BPDC = biphenyl-4,4’-...
the glass transition occurs at around –160°C. As the temperature is raised aboveTg, theamorphousregions within the polymer gain increased mobility. When the temperature of UHMWPE rises above 60–90°C, the smaller crystalline lamellae begin to melt. Themelting behaviourofsemicrystalline polymers, ...
Fig. 1.74.Determination of the glass transition temperature: (A) by dilatometry as the point of intersection of the temperature dependences of the glass and the melt; (B) by DSC on heating as the temperature of half unfreezing. Points 1, 2, 3, 4, 5, and 6 show the position of the ...
The Glass Transition • On cooling, some polymer melts don't crystallize rather they form a glass; Vitrify Tg Force Temperature Soft -- above Tg Hard -- below Tg F α g Specific Vol. Tg Temperature α l α g 2 ≈ Total Volume Occupied Volume • Coefficient of expansion of the ...
Recent publications demonstrate that the maximum homogeneous nucleation rates, I-max of silicate glasses strongly diminish with the reduced glass transition temperature, T-gr (= T-g/T-m/L), where T-g is the glass transition temperature and T-m/L is the melting point or liquidus temperature)...
2, No. 4, 1971 Thermodynamic Studies on the Glass Transition and the Glassy State of Polymers. I. the following quatities a'=V-s=!a(T~g ) ( 3) where Vs is the volume at a certain temperature under atmospheric pressure of the glass formed at Tg and Pg. In this study a'=3.25 ...
radiations monomers/radioinduced polymerization of, effects of melting point and glass transition temperature on formation of glassy phase inorganic compounds/radioinduced polymerization of, effects of melting point and glass transition temperature on formation of glassy phase in...
a) a hydrophobic agent that does not cause any significant color change, nor impart any discoloration to a fabric, characterized as having a melting point or glass transition temperature of less than 100° C.; b) a fluoropolymer; and c) an effective amount of a zeta potential modifier; such...