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The glass transition of a liquid to a solid-like state may occur with either cooling or compression. [10] The transition comprises a smooth increase in the viscosity of a material by as much as 17 orders of magnitude within a temperature range of 500 K without any pronounced change in material structure. [11]
FR-4 (or FR4) is a NEMA grade designation for glass-reinforced epoxy laminate material. ... Glass transition temperature: Can vary, but is over 120 °C
The Flory–Fox equation relates the number-average molecular weight, M n, to the glass transition temperature, T g, as shown below: =, where T g,∞ is the maximum glass transition temperature that can be achieved at a theoretical infinite molecular weight and K is an empirical parameter that is related to the free volume present in the polymer sample.
Besides epoxy resins based on diglycidyl ether of bisphenol A, ... amorphous polymer is cooled down, it solidifies at the glass-transition temperature T g.
The onset temperature of the transition zone, moving from glassy to rubbery, is known as the glass transition temperature, or T g. In the 1940s Andrews and Tobolsky [ 6 ] showed that there was a simple relationship between temperature and time for the mechanical response of a polymer.
Ethylene-acrylate copolymers have lower glass transition temperature and higher adhesion even to difficult substrates than EVA. Better thermal resistance, increased adhesion to metals and glass. Suitable for low temperature use. Ethylene-vinylacetate-maleic anhydride and ethylene-acrylate-maleic anhydride terpolymers offer very high performance ...
Cure temperature should typically attain the glass transition temperature (T g) of the fully cured network in order to achieve maximum properties. Temperature is sometimes increased in a step-wise fashion to control the rate of curing and prevent excessive heat build-up from the exothermic reaction.
[8] [1] The glass transition temperature typically varies from below room-temperature for high off-stoichiometric ratios to 75 °C for a stoichiometric blend of tetrathiol and triallyl. [9] They are typically transparent in the visible range.
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