Crystalline polymers have an ordered molecular arrangement, with a sharp melting point.
结晶质聚合物具有规则的分子排列及明显的熔点。
2
Any type of solid or semi solid organic material of natural or synthetic origin, generally of high molecular weight with no defined melting point. Most resins are polymers.
一类固体或半固体的天然的或合成的有机材料，一般为无清晰熔点的高分子量材料，多数树脂为聚合物。
3
Some important characteristics of polymers include their size (or molecular weight), softening and melting points, crystallinity, and structure.