题目内容

Condensation polymerization involves ______ intermolecular chemical reactions that may include more than a single molecular species.

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Fabrication of plastic polymers is usually accomplished by shaping the material in ______ form at an elevated temperature, using at least one of several different molding techniques—compression, transfer, injection and blow. Extrusion and casting are also possible.

Some fibers are ______ from a viscous melt or solution, after which they are plastically elongated during a drawing operation, which improves the mechanical strength.

Films are formed by extrusion and ______ or by calendering.

The properties of many polymers make them especially amenable to fabrication by 3D printing—e.g., photosensitivity, flexibility, and ______ melting/softening temperatures.