Izinto zePolyester

I-Polyester iyisigaba se-ama-polymereziqukethei-ester iqembu elisebenzayokuyo yonke iyunithi ephindaphindayo yeketanga labo eliyinhloko. Njengento ethileizinto, ngokuvamile kubhekisela ohlotsheni olubizwa ngokuthii-polyethylene terephthalate(PET). Ama-polyester ahlanganisa amakhemikhali atholakala ngokwemvelo, njengaku-izitshalofuthiizinambuzane, kanye nezinto zokwenziwa ezifanai-polybutyrateAma-polyester emvelo kanye nambalwa okwenziwa ngawookubolayo, kodwa iningi lama-polyester okwenziwa alinjalo. Ama-polyester okwenziwa asetshenziswa kakhulu ezingutsheni.

Imicu ye-polyester ngezinye izikhathi iphothwa ndawonye nemicu yemvelo ukuze kukhiqizweindwanguenezakhiwo ezihlanganisiwe.Ukotini-izingxube ze-polyester zingaba namandla, zimelane nemibimbi nokudabuka, futhi zinciphise ukuncipha.Imicu yokwenziwaUkusebenzisa i-polyester kunokumelana okuphezulu kwamanzi, umoya kanye nemvelo uma kuqhathaniswa nemicu etholakala ezitshalweni.ukumelana nomlilofuthi ingancibilika uma ivutha.

Ama-polyester ekristalu ewuketshezi aphakathi kokuqala okusetshenziswa ezimboniniama-polymer ekristalu eliwuketsheziZisetshenziswa ngenxa yezakhiwo zazo zemishini kanye nokumelana nokushisa. Lezi zici zibalulekile nasekusetshenzisweni kwazo njengesiciko esingaguquki ezinjinini zejethi.

Ama-polyester atholakala emvelweni afaka phakathii-cutiningxenye yei-cuticle yezitshalo, equketheama-omega hydroxy acidskanye nemikhiqizo yazo, exhunywe ngei-esterizibopho, zakha ama-polymer e-polyester anobukhulu obungacaci. Ama-polyester nawo akhiqizwa yi-izinyosikuhloboAma-Colletes, okuvezai-cellophane-ulwelwesi olufana ne-polyester lwamaseli abo angaphansi komhlaba olubatholela igama lesidlaliso elithi “izinyosi ze-polyester”.

Kuye ngesakhiwo samakhemikhali, i-polyester ingabai-thermoplasticnomai-thermosetKukhona futhiama-resin e-polyesterilashwe ngama-hardener; nokho, ama-polyester avame kakhulu ama-thermoplastics.[11]Iqembu le-OH lisabela ngendlelaI-IsocyanateInhlanganisela esebenzayo ohlelweni lwezingxenye ezimbili ekhiqiza izembozo ezingase zifakwe umbala ngokuzithandela. Ama-polyester njenge-thermoplastics angashintsha isimo ngemva kokusetshenziswa kokushisa. Nakuba evutha emazingeni okushisa aphezulu, ama-polyester avame ukuncibilika emalangabini futhi azicime ngokwawo lapho evutha. Imicu ye-polyester inezinga eliphezuluukuqinafuthiI-E-moduluskanye nokumuncwa kwamanzi okuphansi kanye nokuncaneukuncishiswauma kuqhathaniswa nezinye izintambo zezimboni.

Ukwandisa izingxenye ezinuka kamnandi ze-polyester kwandisaizinga lokushisa lokushintsha kwengilazi, izinga lokushisa lokuncibilika,ukuzinza kokushisa, ukuqina kwamakhemikhali, kanye nokumelana nezinyibilikisi.

Ama-polyester nawo angabai-telechelic ama-oligomersnjenge-polycaprolactone diol (PCL) kanye ne-polyethylene adipate diol (PEA). Bese zisetshenziswa njengeama-prepolymer.