Ole Fluoropolymer e masani lava ole olefinic polymer lea e aofia ai vaega ole fluorinated monomers olefinic e pei ole vinylidene fluoride (CH2¼CF2) ma le tetrafluoroethylene (TFE) (CF2¼CF2).O nei polymers ua faʻamatalaina auiliili i le tele o faʻamatalaga.E tele polymers fa'apitoa fa'apitoa e aofia ai per-fluoroethers, fluoroacrylates, ma fluorosilicones lea e fa'aaogaina i le la'ititi tele nai lo olefinic fluoropolymers.
Fluoropolymers pisinisi e aofia ai homopolymers ma copolymers.O Homopolymers e aofia ai le 99% pe sili atu i le mamafa o le tasi monomer ma le 1% pe itiiti ifo i le mamafa o le isi monomer e tusa ai ma le feagaiga a le American Society for Testing Materials (ASTM).Copolymers e sili atu i le 1% pe sili atu i le mamafa o le tasi pe sili atu comonomers.Ole tele ole fluoropolymers fa'apisinisi e fa'avae ile tolu monomers:
TFE, vinylidene fluoride (VF2), ma i se tulaga maualalo ole chlorotrifluoroethylene (CTFE).O faʻataʻitaʻiga o comonomers e aofia ai perfluoromethyl vinyl ether (PMVE), perfluoroethyl vinyl ether (PEVE), perfluoropropyl vinyl ether (PPVE), hexafluoropropylene (HFP), CTFE, perfluorobutyl ethylene (PFBE), ma monomers mai fafo e pei ole 2,2-bistri-fluoromethyl. -4,5-difluoro-1,3-dioxole.
O se tulafono lelei o le lima matua e manatua o le faʻateleina o le fluorine o loʻo i totonu o se mole polymer e faʻateleina ai lona vailaʻau ma solvent teteʻe, mumu mumu, ma le photostability;fa'aleleia ana mea tau eletise e pei o le maualalo o le dielectric tumau;fa'aitiitiga fa'atasi o fe'ese'esea'iga;siitia ai le liusuavai;faateleina lona mautu vevela;ma fa'avaivaia ona uiga fa'ainisinia.Solubility o polymers i solvents e masani lava ona faaitiitia e ala i le faateleina o le fluorine i totonu o le mole.
Fa'avasegaga Fluoropolymer
Le maua serendipitous o PTFE i 1938 e Roy Plunkett o DuPont Kamupani amata le vaitaimi o fluoropolymers.PTFE ua maua afe o talosaga ona o lona tulaga tulaga ese.Eseese fluoroplastics ua atiae talu mai le mauaina o le PTFE.O le tele o kamupani e gaosia nei palasitika i le lalolagi atoa.Fluoropolymers ua vaevaeina i ni vasega se lua o polymers perfluorinated ma vaega fluorinated polymers.O fluoropolymers fa'apipi'i o lo'o tu'u fa'atasi ma copolymers o le TFE.O nisi o comonomers e mafai ona i ai sina vaega itiiti o elemene e ese mai le C poʻo le F.
Polymer Development History
O le PTFE e le mafai ona faʻapipiʻiina e auala faʻafefeteina ona o le maualuga o le viscosity.O fluoropolymers e mafai ona liusuavai ua atiaʻe e ala i le kopiina o le TFE.FEP, o le copolymer o le TFE ma le HFP, e maualalo le maualuga o le faʻaaogaina o le vevela nai lo le PTFE (200 C vs. 260 C) ona o le faʻaleagaina o mea tau masini.PFA, o le copolymer o le TFE ma le PPVE poʻo le PEVE, e ofoina atu le faʻamautuina o le vevela, faʻafefeteina ma le maualuga o le faʻaogaina pea o le vevela 260 C. O le FEP ma le PFA e taʻua o perfluoropolymers.
Copolymers o le ethylene faatasi ai ma le tetrafluoroethylene (ETFE) ma le chlorotrifluoroethylene (ECTFE) e sili atu le malosi o le masini nai lo perfluoropolymers, faʻatasi ma fefaʻatauaʻiga o le faʻaitiitia o lo latou tetee faʻamaʻi ma faʻaauau le faʻaaogaina o le vevela ma le faʻateleina o le faʻasologa o feteʻenaʻiga.
Amorphous copolymers o le TFE e solu i solvents halogenated faapitoa ma e mafai ona faʻaoga i luga o se vaifofo polymer e fausia ai ni paʻu manifinifi.O le faʻamago faʻamago e faʻasaʻo i le toetoe lava o le tele o vailaʻau e pei o le PTFE.
Taimi meli: Iul-22-2017