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This relationship is true only up to a certain point, however. The non-linear dependence of the glass transition temperature of molecular weight is described by the Flory-Fox equation: Tg = Tg(∞) − K Mn (4.4.1) (4.4.1) T g = T g ( ∞) − K M n. Here, Tg (∞) refers to the glass transition temperature of an infinitely long chain of the ...
Definition SiO 2 als Kristall: Quarz-Kristall SiO 2 als Glas: Quarzglas. Glas ist eine amorphe Substanz, die durch Schmelzen erzeugt wird. Die Herstellung von Glas ist auch durch Sol-Gel-Prozesse und durch Stoßwellen möglich. Thermodynamisch wird Glas als gefrorene, unterkühlte Flüssigkeit bezeichnet. Diese Definition gilt für alle Substanzen, die geschmolzen und entsprechend schnell ...
glass. From Longman Dictionary of Contemporary English Related topics: Household, Glass, Drink, Food glass1 /ɡlɑːs $ ɡlæs/ S1 W1 noun 1 transparent material [ uncountable] a transparent solid substance used for making windows, bottles etc a glass bowl a piece of broken glass pane/sheet of glass (=a flat piece of glass with straight edges ...
11 de ene. de 2018 · Most definitions tend to call glass an amorphous solid — a solid without crystal-like order — that has a ‘glass transition’. Other definitions focus on how glass is made, such as an ‘amorphous solid achieved by fast cooling of a molten mass’. What these definitions have in common is that glass is considered a solid.
glass objects [uncountable] objects made of glass. We keep all our glass and china in this cupboard. She has a fine collection of Bohemian glass. see also bell glass [singular] a protecting cover made of glass on a watch, picture or photograph frame, fire alarm, etc. In case of emergency, break the glass and press the button. mirror
The glass transition is a property of only the amorphous portion of a semi-crystalline solid. The crystalline portion remains crystalline during the glass transition. At a low temperature the amorphous regions of a polymer are in the glassy state. In this state the molecules are frozen on place. They may be able to vibrate slightly, but do not ...
12 de feb. de 2023 · Believe it or not, glass is made from liquid sand. You can make glass by heating ordinary sand (which is mostly made of silicon dioxide) until it melts and turns into a liquid. You won't find that happening on your local beach: sand melts at the incredibly high temperature of 1700°C (3090°F).
