UC知道模具专业英语翻译............
来源：百度知道 编辑：UC知道 时间：2024/06/07 17:58:30
Classification and Application of Plasstics
Plastics are generally divided into the categories of thermoplastics and thermosets plastics.
Thermoplastics
We noted earlier that,in the amorphous structure of a polymer,the bonds between adjacent long-chain molecules(secondary bonds)are much weaker than the covalent bonds(primary bonds)within each molecule.Hence it is the strength of the seondary bonds that determines the overall strength of the polymer.Linear and branched polymers have weak secondary bonds.
If we now raise the temperature of this polymer above the glass-transition temperature,we find that it becomes softer and easier to form or to mold into a shape.The mobility of the long molecules (thermal vibrations)increases at "Tg"and above.If this polymer is now cooled,it returns to its original hardness and strength.In other words,the process is reversible.
Pllymers that exhibit this behavior are known
Plastics are generally divided into the categories of thermoplastics and thermosets plastics.
Thermoplastics
We noted earlier that,in the amorphous structure of a polymer,the bonds between adjacent long-chain molecules(secondary bonds)are much weaker than the covalent bonds(primary bonds)within each molecule.Hence it is the strength of the seondary bonds that determines the overall strength of the polymer.Linear and branched polymers have weak secondary bonds.
If we now raise the temperature of this polymer above the glass-transition temperature,we find that it becomes softer and easier to form or to mold into a shape.The mobility of the long molecules (thermal vibrations)increases at "Tg"and above.If this polymer is now cooled,it returns to its original hardness and strength.In other words,the process is reversible.
Pllymers that exhibit this behavior are known
塑料分类及应用
塑料一般可分为热塑性塑料和热固性塑料。
热塑性塑料
我们以前曾提到过，在无定形聚合物结构中，每一个分子的相邻长链分子作用力（次级作用力） 远远小于其共价键作用力（初级作用力）。因此，聚合物的强度是由次级作用力的强度决定的。线性和分支状的聚合物一般具有较弱的次级作用力。
当这种聚合物的温度被加热到高于玻璃熔点时，我们就会发现它将变得更柔软，更具可塑性或更易浇铸成型。长分子的流动性（热振动）在"甘油三酯"的作用下将进一步加剧。当聚合物冷却下来后，它将恢复到其原来的硬度和强度。换句话说：这一过程是可逆的。
pllymers表现出的这种特性就被称之为热塑性塑料。像丙烯酸树脂、尼龙、聚乙烯和聚氯乙烯都是这方面的典型例子。
(有些专业名词我也不太懂，你尽量理解吧，不知能否有所帮助？)