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作者在本文中并不想讨论塑料化学方面的问题,但是有必要概述一下各种塑料类型的一般概念,以便于着重讨论塑料各种特殊性能,因为这些性能对于机车车辆工程师的设计工作起着直接的影响. 应当了解,塑料性能所包括的范围比传统材料,如木料,有色金属以及黑色金属要广泛得多.为方便起见,可以把塑料分成两大类:即热塑性塑料和热固性塑料.它们的性能在某些程度上是有相似的地方,但是由于它们的化学性质基本不同,因而在性能方面也
The author does not want to discuss plastic chemistry in this article, but it is useful to outline the general concepts of various plastic types in order to focus on the specific properties of plastics as they are straightforward for rolling stock engineers’ design efforts It should be understood that plastic properties cover a much wider range than conventional materials such as wood, non-ferrous metals and ferrous metals.For convenience, plastics can be divided into two broad categories: thermoplastics and thermosets, whose properties To some extent there are similarities, but because of their basically different chemical properties, so in terms of performance