PET sheet is a kind of polymer material, the full name […]
PET sheet is a kind of polymer material, the full name is polyethylene terephthalate, and it is widely used. The bottle of Nongfu Spring is made of it, which belongs to degradable recycling materials. PET mainly includes polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). PET molecular structure is highly symmetrical and has a certain degree of crystal orientation, so it has high film-forming and flexibility. PET has good optical properties and weather resistance, and amorphous PET has good optical transparency. In addition, PET has excellent wear resistance and dimensional stability. The products made of PET have good transparency, non-toxic, anti-permeation, light weight, high production efficiency, etc. and are therefore widely used. The chemical name of PET sheet is polyethylene terephthalate. It is especially used in the packaging of carbonated drinks, fruit drinks and tea drinks! It grows at a double-digit rate every year. PET characteristics and performance PET is a kind of saturated thermoplastic polymer, PET has 3 key temperature points in the heating process. These three temperature points divide PET into 4 states. This state is represented by different arrangements of PET household chains, which also determines the different properties of PET.
(1) The glass transition temperature from the high elastic state to the amorphous glass state is called the glass transition, and the temperature at this time (PET is about 80 ℃) is called the glass transition temperature, which reflects the long segment r segment motion. (2) The temperature of the finished product continues to rise. When it reaches 160°C, multiple molecular chains with molecular interactions are rearranged locally, resulting in spherical crystals. Due to the separation of PET, the benzene ring is very slow, and the crystallization degree of PET sheet is about 55%. A f-order crystalline region can be produced. PET bottles of Shuanger 11 pull f, 11 after heating. The preform in the initial amorphous state becomes highly elastic, just like rubber. After biaxial stretching, the Oita chain is oriented along the pull-out direction to give birth to the clinic. After blowing the bottle, the material becomes hard.