I-Polyester luhlobo lweiipolimaeziqulathei-ester iqela elisebenzayokwiyunithi nganye ephindaphindwayo yekhonkco labo eliphambili. Njengento ethileizinto, idla ngokubhekisa kuhlobo olubizwa ngokubai-polyethylene terephthalate(PET). Iipolyester ziquka iikhemikhali zendalo, ezifanaizityalokwayeizinambuzanekunye nezinto zokwenziwa ezifanai-polybutyrateIipolyester zendalo kunye nezinye ezimbalwa ezenziwe ngokwenziwaiyabola, kodwa uninzi lweepolyester zokwenziwa azinjalo. Iipolyester zokwenziwa zisetyenziswa kakhulu kwiimpahla.
Iifayibha zepolyester ngamanye amaxesha zisontwa kunye neefayibha zendalo ukuvelisailaphueneempawu ezixutyiweyo.Umqhaphu-imixube yepolyester inokuba namandla, imelane nemibimbi nokukrazuka, kwaye inciphise ukuncipha.Iifayibha ezenziweyoUkusebenzisa i-polyester kunokumelana okuphezulu kwamanzi, umoya kunye nokusingqongileyo xa kuthelekiswa neefayibha ezivela kwizityalo.ayitshisikwaye inokunyibilika xa ivutha.
Iipolyester zekristale ezingamanzi ziphakathi kwezokuqala ezisetyenziswa kwimizi-mvelisoiipolymers zekristale yolweloZisetyenziselwa iimpawu zazo zoomatshini kunye nokumelana nobushushu. Ezi mpawu zibalulekile nasekusetyenzisweni kwazo njengesitywino esingenakugungqiswa kwiinjini zejethi.
Iipolyester ezifumaneka kwindalo ziqukai-cutininxalenye yei-cuticle yezityalo, equkaii-omega hydroxy acidskunye neziphumo zazo, ezidityaniswe ngei-esteriibhondi, zenza iipolymers zepolyester ezinobukhulu obungacacanga. Iipolyester nazo ziveliswaiinyosikwi-genusIiColletes, evelisai-cellophane-i-polyester layer ye-brood cells zabo ezingaphantsi komhlaba ezizinika igama lesidlaliso elithi "ii-polyester beees".
Ngokuxhomekeke kwisakhiwo seekhemikhali, i-polyester ingaba yi-i-thermoplasticokanyei-thermosetKukwakhoiiresini zepolyesterzinyangwa zizixhobo zokuqinisa; nangona kunjalo, iipolyester ezixhaphakileyo ziithermoplastics.[11]Iqela le-OH lisabela ngendlelaI-IsocyanateIkhompawundi esebenzayo kwinkqubo enamacandelo amabini evelisa iingubo ezinokuthi zifakwe umbala. Iipolyester njenge-thermoplastics zinokutshintsha imo emva kokusetyenziswa kobushushu. Nangona zinokutsha kumaqondo obushushu aphezulu, iipolyester zihlala zincipha zingabi namalangatye kwaye zizicime xa zitsha. Iifayibha zepolyester zinomlinganiselo ophezuluukuqinakwayeI-E-moduluskunye nokufunxwa kwamanzi okuncinci kunye nokuncinciukuncitshiswaxa kuthelekiswa nezinye iifayibha zoshishino.
Ukwandisa iindawo ezinevumba elimnandi ze-polyester kwandisaubushushu bokutshintsha kweglasi, ubushushu bokunyibilika,uzinzo lobushushu, uzinzo lweekhemikhali, kunye nokumelana nesinyibilikisi.
Iipolyester nazo zinokubai-telechelic ii-oligomersnjenge-polycaprolactone diol (PCL) kunye ne-polyethylene adipate diol (PEA). Emva koko zisetyenziswa njengeiiprepolymers.
Ixesha lokuthumela: Disemba-06-2022