Polyester ndi gulu lama polimazomwe zili ndiester gulu logwira ntchitomu gawo lililonse lobwerezabwereza la unyolo wawo waukulu. Monga chinthu chapaderazinthu, nthawi zambiri limatanthauza mtundu wotchedwapolyethylene terephthalate(PET). Ma polyester amaphatikizapo mankhwala achilengedwe, mongazomeranditizilombokomanso zinthu zopangidwa mongapolybutyrateMa polyester achilengedwe ndi ena ochepa opangidwa ndichowola, koma ma polyester ambiri opangidwa si opangidwa. Ma polyester opangidwa amagwiritsidwa ntchito kwambiri mu zovala.
Ulusi wa polyester nthawi zina umapota pamodzi ndi ulusi wachilengedwe kuti apangensaluyokhala ndi zinthu zosakanikirana.Thonje-Zosakaniza za poliyesitala zimatha kukhala zolimba, zolimba makwinya ndi kung'ambika, komanso zimachepetsa kuchepa.Ulusi wopangidwaKugwiritsa ntchito polyester kumakhala ndi mphamvu zambiri zoteteza madzi, mphepo komanso chilengedwe poyerekeza ndi ulusi wochokera ku zomera.chosagwira motondipo imatha kusungunuka ikayaka.
Ma polyester amadzimadzi opangidwa ndi kristalo ndi ena mwa oyamba kugwiritsidwa ntchito m'mafakitalema polima amadzimadzi a kristaloAmagwiritsidwa ntchito chifukwa cha mphamvu zawo zamakaniko komanso kukana kutentha. Makhalidwe amenewa ndi ofunikiranso pakugwiritsa ntchito ngati chisindikizo chosatha mu injini za jet.
Ma polyester omwe amapezeka m'chilengedwe akuphatikizapocutingawo lacuticle ya zomera, chomwe chili ndiomega hydroxy acidsndi zotumphukira zawo, zogwirizana kudzeraesterzomangira, zomwe zimapangitsa ma polima a polyester a kukula kosatsimikizika. Ma polima amapangidwanso ndinjuchimu mtunduMa Colletes, zomwe zimatulutsacellophane- ngati nsalu ya polyester ya maselo awo a ana a pansi pa nthaka omwe amawapangitsa kutchedwa dzina loti "njuchi za polyester".
Kutengera kapangidwe ka mankhwala, polyester ikhoza kukhalathermoplastickapenathermosetPalinsoutomoni wa polyesteramachiritsidwa ndi zinthu zolimbitsa; komabe, ma polyester odziwika kwambiri ndi ma thermoplastics.[11]Gulu la OH layankhidwa ndiIsocyanateChogwirira ntchito chomwe chili mu dongosolo la zigawo ziwiri chimapanga zokutira zomwe zingasinthidwe kukhala utoto. Ma polyester monga ma thermoplastics amatha kusintha mawonekedwe akagwiritsidwa ntchito kutentha. Ngakhale kuti amatha kuyaka kutentha kwambiri, ma polyester amakonda kufooka ku malawi ndikudzizimitsa okha akayatsidwa. Ulusi wa polyester uli ndi mphamvu zambirikulimba mtimandiE-moduluskomanso kuyamwa madzi pang'ono komanso kuchepa kwa madzikuchepapoyerekeza ndi ulusi wina wa mafakitale.
Kuonjezera magawo onunkhira a polyester kumawonjezerakutentha kwa kusintha kwa galasikutentha kwa kusungunuka,kukhazikika kwa kutentha, kukhazikika kwa mankhwala, komanso kukana zosungunulira.
Ma polyester amathanso kukhalatelechelic oligomersmonga polycaprolactone diol (PCL) ndi polyethylene adipate diol (PEA). Kenako amagwiritsidwa ntchito ngatiprepolymers.
Nthawi yotumizira: Dec-06-2022