From today, we will popularize knowledge related to plastics in an easy-to-understand manner, mainly so that friends who do industrial design and appearance modeling have a preliminary understanding of plastics, of course, do structural design and related materials. Friends can also serve as snacks and propose. The Atlas will be a series, I hope everyone will continue to pay attention to it.
What is plastic? Speaking of plastics, first of all we need to talk about polymers. What are polymers? The English word Polymers for polymers means "many" in Greek, and we can also understand it as "long chain molecules with many repeating combinations". High molecular weight polymers are divided into two categories, one of which is polymers in nature, such as protein, starch, cellulose, etc.
Another class of human-synthesized polymers: mainly plastics, which are synthetic polymeric materials usually derived from hydrocarbons or crude oil. In US, plastic accounts for 6-10% of US fuel consumption, approximately 2 million barrels per day.
Plastics are divided into thermoplastic and thermosetting materials. Thermoplastics deform and melt when heated, as shown in figure on left. Thermosetting materials do not deform when heated, such as eggshells
This image shows a thermoset plastic that is typically used in high temperature environments, high resistance situations, or in some compounds. Not recyclable. For example, bananas, phenol, melamine, etc.
For thermoplastics, molecular chain is easily deformed and can easily change shape under action of various processes. Most of them can be recycled. Most often used for plastic toys. Plastics commonly used in toys include ABS\PVC\PP\PE
Commonly used transparent plastics: PS\PMMA\PC\PET
This figure shows eight most commonly used thermoplastics. This is end of content and each thermoplastic material will be explained separately in next issue. Welcome to follow us. Questions are also welcome.