Many people think that polyester and polyester staple fiber are two different fibers. In fact, these two fibers refer to the same raw material. Polyester is a universal name in the world, first of all because of the product name produced earlier, and now it has become a common name; Polyester is the Chinese name, and polyester is generally named after polyester in China.
Polyethylene terephthalate (pet) is the basic component of Pet and has the molecular formula α-oc-ph-cooch2ch2co2o-αn, so it is also called pet. The chemical structure of long-chain molecules is h(ch2ccooo) noch2ch2oh, which is relatively The molecular weight is about 18000-25000. In fact, there are a small amount of monomers and oligomers, these oligomers have oligomerization degree and ring shape, polyethylene terephthalate (a) and ethylene glycol (eg) can pass It is formed by direct esterification of 9bet terephthalate.
From the perspective of the molecular composition of polyester, it is composed of short aliphatic hydrocarbon chains, ester groups, benzene rings and terminal alcoholic hydroxyl groups. In addition to the two alcohol-terminated hydroxyl groups in polyester fiber, there is no polar group, so the hydrophilicity of polyester fiber is extremely poor. The polyester molecule contains about 46% of ester groups, which can be hydrolyzed and pyrolyzed at high temperature, and soaped with alkali to reduce the degree of polymerization. The polyester molecule also contains aliphatic hydrocarbon chains, which can make the polyester molecule have a certain degree of flexibility. However, because polyester molecules also have benzene rings that cannot rotate internally, polyester macromolecules are basically rigid molecules, and the molecular chain is easy to maintain linearity. Therefore, polyester macromolecules are easy to form crystals under such conditions, so the crystallinity and orientation of polyester are relatively high.
Polyester is an important variety of synthetic fiber, and it is the trade name of polyester fiber in my country. It is a fiber-forming polymer, polyethylene terephthalate, made of purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification, Prepared by transesterification and polycondensation reactions. The fiber is made by spinning and post-processing.
Polyester is also called Terylene, and Americans also call it "Dacron". When it appeared in the Hong Kong market, people translated it as "Qingliang" or "Qingliang" [凉,良 Cantonese homophone] according to Cantonese, which means "Qingliangliang", which is a household name.
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