Polyethylene terephthalate (PET) ndeye semi crystalline polymer ine yakanakisa makemikari kuramba, kunyungudika kufamba uye spinnability. Iyo polima inoumbwa nemayuniti anodzokorora sezvakaratidzwa muMufananidzo 1. Chikamu chimwe nechimwe chine hurefu hwemuviri hunosvika 1.09 nm uye molecular huremu hwe ~ 200. Kana inogadzirwa kubva mukuita kwe terephthalic acid uye ethylene glycol, inovharirwa kuruboshwe neH- uye kurudyi ne -OH. Polymerization nekudaro inoperekedzwa nekugadzirwa kwemvura iyo inobviswa pasi pe tembiricha yakakwira uye vacuum. Saizvozvo kuvepo kwemvura munzvimbo yakanyungudutswa inokurumidza kudzikisa chimiro kuitira kuti kunyatsoomeswa kwepolymer kusati kwanyunguduka kutenderera kwe fiber kunodiwa.

Mhete inonhuhwirira yakasanganiswa nepfupi aliphatic cheni inoita kuti polima riome morekuru kana zvichienzaniswa nemamwe mapolima ariphatic senge polyolefin kana polyamide. Kushaikwa kwesegmental mobility mumaketani epolymer kunokonzeresa kugadzikana kwakanyanya kwekushisa. Iyo textile giredhi polymer ichave neavhareji nhamba yezana inodzokororwa mayunitsi pamorekuru kuitira kuti kureba kweiyo yakajairwa polymer cheni ingangoita 100nm ine huremu hwemamorekuru hunosvika zviuru makumi maviri. Yepamusoro mazinga epolymerization anoburitsa yakakwirira simba fiber asi kunyunguduka viscosity uye kugadzikana kwekunyunguduka kusvika kunyange hudiki hunyoro hunokonzera kuderera kwehydrolytic. Kuyera kweavhareji dhigirii repolymerization kunoitwa kungave neyakanyungudutswa viscosity (nekuyera kudonha kwekumanikidza kuburikidza neyakagadziriswa orifice) kana viscosity yepolymer yakanyungudutswa mune yakakodzera solvent. Iyo yekupedzisira chiyero chepolymer cheni kureba inozivikanwa seIntrinsic viscosity kana IV uye kukosha kweiyo yakajairwa fiber giredhi polymer i0.6 dl/g mu 60/40 w/w musanganiswa we phenol uye tetrachloroethane solvent. Iyo IV mune yekupedzisira solvent ine hukama neMv (Viscosity average molecular weight) yepolymer naMark Howink equation (Equation 1).