• Guest, you're invited to help build our new TBT time capsule! It contains three parts, with some of its elements planned to open in 2029 and others not until the distant future of 2034. Get started in 2024 Community Time Capsule: Blueprints.

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Anna Wintour

Beyonce

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Lady Gaga

Simon Cowell

The cast of Glee

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The cast of Mad Men

Thanks for playing! 3/23/11 4:39pm
 
A thermoplastic, or thermosoftening plastic, is a polymer that becomes pliable or moldable above a specific temperature, and returns to a solid state upon cooling.[1][2] Most thermoplastics have a high molecular weight. The polymer chains associate through intermolecular forces, which permits thermoplastics to be remolded because the intermolecular interactions increase upon cooling and restore the bulk properties. In this way, thermoplastics differ from thermosetting polymers, which form irreversible chemical bonds during the curing process. Thermosets often do not melt, but break down and do not reform upon cooling. Stress strain graph of thermoplastic material.
Above it's glass transition temperature, Tg, and below its melting point, Tm, the physical properties of a thermoplastic change drastically without an associated phase change. Within this temperature range, most thermoplastics are rubbery due to alternating rigid crystalline and elastic amorphous regions, approximating random coils.[citation needed]
 
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