PET and PETE are short for polyethylene terephthalate. It may also be referred to simply as PETP or PET-P.
APET and PETG are PETde copolymers, also known as non-crystalline polybutyl terephthalates, which are heat shrinkable polyester films.
Ordinary polyester is generally obtained by esterification and polycondensation of terephthalic acid (PTA) and ethylene glycol (EG), and is a crystalline polymer (strictly speaking, a polymer in which a crystalline region and an amorphous region coexist). . It is generally milky white or light yellow, highly crystalline polymer, the surface is smooth and shiny, the product is processed even at lower temperatures, and it can remain transparent without adding filler. Excellent physical and mechanical properties can be maintained over a wide temperature range, with long-term use temperatures up to 120 degrees. Electrical insulation performance is good. Resistance to creep, friction and fatigue. Has good dimensional stability. However, due to its high glass transition temperature, low crystallization rate, difficult processing, high molding temperature, long production cycle and poor impact resistance. Therefore, it is necessary to improve the processing performance by means of reinforcement, filling, blending and the like. The use of PET can be divided into fibers (early used for synthetic fiber consumption of 70%) and non-fibres. The latter include well-known packaging materials (food and beverage containers, vacuum packaging, etc.), insulating materials, tape bases, movies and photographic film.
The so-called copolymerization modification is to introduce the third or even the fourth component to participate in copolymerization in addition to the main components of terephthalic acid (PTA) and ethylene glycol (EG), in order to produce an asymmetric molecular structure. An amorphous PET copolymer is formed. When copolymerized with a dicarboxylic acid (Acidic), the resulting PET copolymer is called APET. APET's low temperature toughness (impact resistance and tear resistance) and heat resistance are improved compared to PET. The appearance of the product is higher in transparency; when copolymerized with glycol (Glycolic), the obtained PET copolymer is called PETG. PETG has better hardness, stiffness and toughness than PET homopolymer and maintains its toughness at low temperatures. The product is more transparent and can even be colorless. In actual processing, PET is provided in the form of grains, while both APET and PETG are available in the form of amorphous materials.
