Transition Glasses Meaning
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T g occurs in a temperature range over which the mobility of the polymer chains increases significantly. Thermoplastics like polystyrene (PS) and poly(methyl methacrylate) (PMMA) are usually used below their glass transition temperature, i. e., in their glassy state. Elastomers like polyisoprene and butadiene rubber (BR) are used above their T g, where they are soft and supple. Determination of the glass transition temperature is a tool for material identification. The glass transition temperature (T g) also determines the application field of a material. For example, a rubber tire (car) is soft and ductile because at normal operating temperatures it is well above its glass transition temperature. If its glass transition temperature were higher than its operating temperature, it would not have the flexibility needed to grip the pavement. Other polymers operate below their glass transition temperature, e. g., a stiff plastic handle. If the plastic handle had a glass transition temperature below its operating temperature, it would be too flexible.
Transition glasses meaning in computer
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Transition glasses meaning of
Transition glasses meanings
Transition glasses meaning definition
the sample length amounted to 2 mm. The extrapolated onset temperature of -62°C corresponds to the glass transition (Tg). In amorphous materials such as rubber, it is a reversible transition. The material changes from a hard and relatively brittle state into a soft or rubbery state. Determination of the Glass Transition by means of Dilatometry Cookie settings We use cookies in order to design our websites optimally for you. Some of them are technically necessary, while others help us to improve this website and your experience. You are free to decide which categories you would like to permit. Please note that depending on the settings you choose, the full functionality of the website may no longer be available. Further information can be found under Cookie Details. Manage cookie settings Contact Local Contact
Transition glasses were formulated to take the hassle out of changing glasses for outdoor and indoor tasks. Transition lenses may not react, however, when driving a car. This is due to the fact that most windscreens come fitted with some UV protection in the glass. If the windscreen inhibits UV levels sufficiently, there may not be enough UV to activate the tint in the glasses. Many people who use Transitions lenses keep a cheap pair of sunglasses in the car due to this lack of reaction. Previous Entry: Memory plastic glasses Next Entry: About Full frame glasses