Cov Khoom Siv Polyester

Polyester yog ib pawg ntawmcov polymersuas muaj covester pawg ua haujlwmhauv txhua chav rov ua dua ntawm lawv cov saw hlau tseem ceeb. Raws li qhov tshwj xeebcov khoom siv, nws feem ntau yog hais txog ib hom hu uapolyethylene terephthalate(PET). Polyesters suav nrog cov tshuaj lom neeg uas tshwm sim hauv ntuj, xws li hauvcov nroj tsuagthiabkabthiab cov khoom siv hluavtaws xws lipolybutyrateCov polyesters ntuj thiab ob peb yam khoom siv hluavtaws yoguas lwj tau, tab sis feem ntau cov polyesters ua los ntawm cov khoom siv tsis yog. Cov polyesters ua los ntawm cov khoom siv feem ntau siv rau hauv khaub ncaws.

Cov xov polyester qee zaum raug sib xyaw ua ke nrog cov xov ntuj los tsim ib qhodaim ntaubnrog cov khoom sib xyaw.Paj rwb-Cov polyester sib xyaw ua ke tuaj yeem muaj zog, tiv taus wrinkle thiab kua muag, thiab txo qhov ntsws.Cov xov paj ua los ntawm cov khoom siv hluavtawssiv polyester muaj dej siab, cua thiab kev tiv thaiv ib puag ncig piv rau cov fibers cog los ntawm cov nroj tsuag. Lawv tsawg duativ taus hluav tawsthiab tuaj yeem yaj thaum raug hluav taws.

Cov polyesters crystalline ua kua yog cov thawj coj siv hauv kev lag luamcov kua siv lead ua kua polymersLawv siv rau lawv cov khoom siv kho tshuab thiab tiv taus cua sov. Cov yam ntxwv no kuj tseem ceeb hauv lawv daim ntawv thov ua lub foob abradable hauv cov cav dav hlau.

Polyesters uas tshwm sim hauv xwm muaj xws litxiavib feem ntawmcov tawv nqaij ntawm cov nroj tsuag, uas muaj covomega hydroxy acidsthiab lawv cov derivatives, interlinked los ntawmestercov ntawv cog lus, tsim cov polyester polymers ntawm qhov loj me tsis paub meej. Polyesters kuj tseem tsim los ntawmcov muvnyob rau hauv lub neejCov Colletes, uas tso tawm ib qhocellophane-zoo li polyester sab hauv rau lawv cov qe menyuam hauv av ua rau lawv tau lub npe menyuam yaus "polyester bees".

Nyob ntawm cov qauv tshuaj lom neeg, polyester tuaj yeem yog ib qhothermoplasticlos yogthermoset. Kuj tseem muajcov tshuaj polyesterkho los ntawm cov khoom siv tawv; txawm li cas los xij, cov polyesters feem ntau yog thermoplastics.[11]Pawg OH raug tshuaj nrog ib qhoIsocyanatecov tshuaj sib xyaw ua haujlwm hauv 2 lub tshuab tsim cov txheej uas tej zaum yuav xaiv tau xim. Polyesters ua cov thermoplastics yuav hloov pauv cov duab tom qab siv cua sov. Txawm hais tias kub hnyiab tau ntawm qhov kub siab, polyesters feem ntau yuav ntsws ntawm cov nplaim taws thiab tua nws tus kheej thaum hluav taws. Polyester fibers muaj siabkev ua siab ntevthiabE-modulusnrog rau kev nqus dej tsawg thiab tsawg heevkev ntsws me mepiv rau lwm cov fibers industrial.

Kev ua kom cov khoom muaj ntxhiab ntawm polyesters nce lawv covkub hloov iav, kub yaj,kev ruaj khov ntawm thermal, kev ruaj khov tshuaj lom neeg, thiab kev tiv taus cov kuab tshuaj.

Cov polyester kuj tseem tuaj yeem ua tautelechelic cov oligomerszoo li cov polycaprolactone diol (PCL) thiab cov polyethylene adipate diol (PEA). Tom qab ntawd lawv siv uacov prepolymers.