The basic substance of the lanyard
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Polyester lanyard is composed of various substances, each of which constitutes the unique function of the lanyard, so what asubstancepainter快捷键re isubstance什么意思ts basic clanyard 翻译omponents?
The formation of the hanging belt is due to the growing development and expansion of the textile industry, mainly from the weaving of the belt, its role is also very extensive, the use of great, sometimes you can not imagibasic什么意思中文ne.
The basic composition of polyester is polyethylene terephthalate, so it ibasic语言s also called polyester fiber (PET). The chemical strubasically翻译cture formula of its long chain molecule is, and the relative molecular weight is about 18000~25000. In fact, a small number of monomersubstance怎么读音s and oligomers are present. These oligomers hasubstancepainterve low degree of polymerization anbasic语言d exlanyard 是什么意思ist in circular form. Polyethylene terephthalate can be synthesized by condensation ofbasic编程语言 ethyl terephthalate 9BHET from terephthalate (PTA蓝牙rdc) and ethylene glycol (EG) by direct esterification.
From the poibasic是高级语言吗nt of view of polyester molesubstancecular composition, it is composebasic编程语言d of short aliphatic hydsubstancepainter快捷键rocarbon chain, ester group, benzene ring, alcohol-terminated hydroxyl group. In addition to two alcohol-terminated hydroxyl groups, there are no other polar groups in the polyes蓝牙rdater molecule, so the hydrophilicity of polyester fiber is very poor. Polyester mobasic编程语言lecule consubstance什么意思tains about 46% ester group, ester group can be hydrolyzed at high temperature, thermal cracking, alkaline saponysis, so that the dbasic翻译egree of polymerization is reduced.
The polyestbasic语言入门教程er molecule also contains aliphatic hydrocarbon chains, which can make the polyester mobasic语言入门教程lecule flexible to a certain extent. However, because there are benzene rings in the polyester molecule that calanyard 是什么意思nnot rotate internally, the polyester macromolecules are basically rigid molecules, and the molecular chain is easy to keep linear. Therefore, dacron malanyard 是什么意思cromolanyard looplecsubstance什么意思ul蓝牙rdaes are easy to crystallize under this condition, so the crystallinity and orientation of dacrobasic是高级语言吗n are high.
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