Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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thermoplastic resins

Resins composed of separate linear non-reactive macromolecules which, upon being heated, become plastic due to the reduction of intermolecular forces. Such resins can be made to flow under pressure in this state; upon cooling they regain their original physical properties. The heating-cooling cycle can be repeated as long as there is no thermal degradation of the polymer. Most thermoplastic resins are produced by forcing the heated material into a mold or through a die under pressure, followed by cooling. The important thermoplastic processing techniques include injection molding, extrusion, and calendering. Many such resins are also soluble in various organic solvents, with the same intermolecular cohesive forces being overcome in the process of solution. The more important thermoplastic resins include polyvinyl chloride, polyethylene, polystyrene, and cellulose acetate. (233 )




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