热塑性塑料通常分为两类：即结晶质的和非结晶质的。
Thermoplastics are generally divided into two classes: namely crystalline and amorphous.
结晶度：聚合物可以是晶体状的或非结晶质的，但它们通常是晶体状和非结晶质结构的结合物(半晶体)。
Crystallinity. Polymers can be crystalline or amorphous, but they usually have a combination of crystalline and amorphous structures (semi-crystalline).
根据各自的结构不同，聚合物可以是亲水的或憎水的（喜欢或 讨厌水）、硬的或软的、晶体状的或非结晶质的、易起反应的或不易起反应的。
Depending on the structure the polymer may be hydrophilic or hydrophobic (likes or hates water), stiff or flexible, crystalline or amorphous, reactive or unreactive.
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