The chemical name of PET is polyethylene terephthalate, also known as polyester, with the chemical formula COC6H4COOCH2CH2O.
The chemical name of PET is polyethylene terephthalate, also known as polyester, with the chemical formula COC6H4COOCH2CH2O.Polyethylene terephthalate (PET) is produced through the transesterification of dimethyl terephthalate with ethylene glycol or the esterification of terephthalic acid with ethylene glycol, followed by the synthesis of dihydroxyethyl terephthalate and then by polycondensation.It belongs to the crystalline saturated polyester, which is a milky white or light yellow high-crystalline polymer with a smooth and glossy surface.It is a common type of resin in daily life and can be divided into APET, RPET and PETG.
PET is a milky white or light yellow, highly crystalline polymer with a smooth and glossy surface.It has excellent physical and mechanical properties in a wide temperature range, with a long-term use temperature of up to 120°C. It has excellent electrical insulation properties, and even at high temperatures and high frequencies, its electrical properties are still good, but its corona resistance is poor, creep resistance, fatigue resistance, friction resistance, and dimensional stability are all very good.PET has ester bonds and can be decomposed under the action of strong acids, strong alkalis, and water vapor. It is resistant to organic solvents and has good weather resistance.
The disadvantages are slow crystallization rate, difficult molding processing, high molding temperature, long production cycle, and poor impact performance.Generally, the processability and physical properties are improved by means of reinforcement, filling, and blending. The reinforcement effect of glass fiber is particularly noticeable, enhancing the rigidity, heat resistance, chemical resistance, electrical properties, and weather resistance of the resin.However, the slow crystallization rate still needs to be improved, and measures such as adding nucleating agents and crystallization promoters can be taken.Adding flame retardant and anti-dripping agent can improve the flame retardancy and self-extinguishing property of PET.