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| Glossary |
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| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
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Thermoforming:
The process of heating a thermoplastic sheet to a working temperature and then forming it into a finished shape by means of heat or pressure. (Modern Plastics Encyclopedia 1995).
Thermoplastic:
- Capable of being repeatedly softened by heat and hardened by cooling.
- A material that will repeatedly soften when heated and harden when cooled. Typical of the thermoplastic family are the styrene polymers and copolymers, acrylics, cellulosics, polyethylenes, polypropylene, vinyls and nylons. (Plastics Engineering Handbook of The Society of the Plastics Industry, Inc., edited by Michael L. Berins, 1991).
Thermoset:
A material that will undergo or has undergone a chemical reaction through the application of heat and pressure, catalysts, ultraviolet light, etc., leading to a relatively infusible state. Typical of the plastics in the thermosetting family are the aminos (melamine and urea), most polyesters, alkyds, epoxies, and phenolics. (Plastics Engineering Handbook of The Society of the Plastics Industry, Inc., edited by Michael L. Berins, 1991).
Tacticity
The orderliness of the succession of configurational repeating units in the main chain of a regular macromolecule (or oligomer or block).
Tear Resistance
The force required to tear completely across a specifically nicked rubber test specimen, or right angle test specimen, by elongating at a specific rate. See ASTM Method D 624.
Tear strength
Film must have certain resistance to tear loading. Tear strength indicates the average force required to propagate tearing through a specified length of the film sample. This test is suitable for investigation of orientation balance of the film. Normally tear strength is measured in two directions, parallel and transverse to the extrusion direction of the film.
Telomer
A substance composed of macromolecules or oligomer molecules having few, usually terminal, reactive functional groups enabling, under appropriate conditions, the formation of larger macromolecules
Thermogravimetry (TG, TGA)
Thermogravimetry (TG, TGA) can be used to measure any reaction involving mass change. TG analysis is often complementary test to DSC, the weight loss curve giving a picture of the make-up of the material by showing the temperatures at which individual components volatilize.
Thermomechanical Analysis (TMA)
Thermomechanical Analysis (TMA) is is a technique for monitoring changes of physical dimensions (expansion, schrinkage, penetration) while the temperature of the sample is changed. |
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