Fluoropolymer na-abụkarị olefinic polymer nke nwere akụkụ olefinic monomers ma ọ bụ nke zuru ezu dị ka vinylidene fluoride (CH2¼CF2) na tetrafluoroethylene (TFE) (CF2¼CF2).A na-ekpuchi polymer ndị a n'ụzọ zuru ezu n'ọtụtụ ntụaka.Ọpụrụiche fluorinated polymers gụnyere per-fluorothers, fluoroacrylates, na fluorosilicones nke a na-eji na obere olu karịa olefinic fluoropolymers.
Fluoropolymers azụmahịa gụnyere homopolymers na copolymers.Homopolymers nwere 99% ma ọ bụ karịa site n'ịdị arọ otu monomer na 1% ma ọ bụ obere site na ịdị arọ nke monomer ọzọ dịka nkwekọrịta nke American Society for Testing Materials (ASTM).Copolymers nwere ihe karịrị 1% ma ọ bụ karịa site n'ịdị arọ nke otu ma ọ bụ karịa comonomers.Ndị isi fluoropolymers azụmahịa na-adabere na monomers atọ:
TFE, vinylidene fluoride (VF2), na n'ókè dị nta chlorotrifluoroethylene (CTFE).Ihe atụ nke comonomers gụnyere perfluoromethyl vinyl ether (PMVE), perfluoroethyl vinyl ether (PEVE), perfluoropropyl vinyl ether (PPVE), hexafluoropropylene (HFP), CTFE, perfluorobutyl ethylene (PFBE), na exotic monomers dị ka 2,2-bistri-fluoromethyl. -4,5-difluoro-1,3-dioxole.
Ezi iwu nke isi mkpịsị aka icheta bụ na ịba ụba nke fluorine nke molekul polymer na-abawanye nguzogide kemịkalụ na ihe mgbaze, ọkụ ọkụ, na fototability;na-eme ka ihe ndị eletrik ya dịkwuo mma dị ka ala dielectric mgbe niile;na-ebelata ọnụọgụ nke esemokwu;na-ebuli ebe mgbaze;na-abawanye nkwụsi ike nke thermal;na-ebelata ya n'ibu Njirimara.Solubility nke polymers na ihe mgbaze na-ebelatakarị site n'ịbawanye ọdịnaya fluorine nke molekul.
Nhazi fluoropolymer
Nchọpụta serendipitous nke PTFE na 1938 nke Roy Plunkett nke ụlọ ọrụ DuPont malitere oge fluoropolymers.PTFE achọtala ọtụtụ puku ngwa n'ihi ihe pụrụ iche ya.E mepụtala fluoroplastics dị iche iche kemgbe achọpụtara PTFE.Ọtụtụ ụlọ ọrụ na-emepụta plastik ndị a gburugburu ụwa.A na-ekewa Fluoropolymers ụzọ abụọ nke polymers perfluorinated na akụkụ ụfọdụ fluorinated.Fluoropolymers perfluorinated bụ homopolymers na copolymers nke TFE.Ụfọdụ n'ime comonomers nwere ike ịnwe obere ihe ndị ọzọ karịa C ma ọ bụ F.
Akụkọ mmepe polymer
Enweghị ike ịmepụta PTFE site na usoro nhazi agbaze n'ihi nnukwu viscosity ya.Emepụtala fluoropolymers nwere ike ịgbaze site na copolymerization nke TFE.FEP, copolymer nke TFE na HFP, nwere oke okpomọkụ na-aga n'ihu na-aga n'ihu karịa PTFE (200 C vs. 260 C) n'ihi mmebi nke ihe eji arụ ọrụ.PFA, a copolymer nke TFE na PPVE ma ọ bụ PEVE, na-enye thermal nkwụsi ike, gbazee-processibility na kacha na-aga n'ihu ojiji okpomọkụ 260 C. Ma FEP na PFA na-ewere perfluoropolymers.
Copolymers nke ethylene nwere tetrafluoroethylene (ETFE) na chlorotrifluoroethylene (ECTFE) dị ike karịa perfluoropolymers, na-esonyere ya na mbelata nke nguzogide kemịkalụ ha na ọnọdụ okpomọkụ na-aga n'ihu na mmụba na ọnụọgụ nke esemokwu.
Amorphous copolymers nke TFE bụ soluble na pụrụ iche halogenated solvents na ike tinye n'elu dị ka polymer ngwọta na-etolite mkpa mkpuchi.Ihe mkpuchi a mịrị amị na-eguzogide ihe fọrọ nke nta ka ọ bụrụ ọtụtụ kemịkalụ dị ka PTFE.
Oge nzipu: Jul-22-2017