Such polymers, unless of extremely high molecular weight (1,000,000), can usually be dissolved and, when heated, they soften or melt so that they can be extruded into fibers or moulded into desired shapes. These polymers are said to be thermoplastic.

• 这样的聚合物,除分子量特别高的(1,000,000以上)外,通常都能被溶解。当被加热时,它们就会软化或者熔化,以致于它们能被挤压成纤维或者注塑成所需的形状,这类聚合物被称为热塑型聚合物。