Fluoropolymer Monomer Synthesis: Tetrafluoroethylene; Hexafluoropropylene; Perfluoroalkyl Vinyl Ethers; Chlorotrifluoroethylene; Vinylidene Fluoride; Vinyl Fluoride.
Cov khoom ntawm Tetrafluoroethylene
Tetrafluoroethylene yog cov xim tsis muaj xim, tsis muaj ntxhiab, tsis muaj ntxhiab, tsis muaj tshuaj lom uas kub hnyiab ntawm 76.3 C thiab melts ntawm 142.5 C. Qhov kub thiab txias ntawm TFE yog 33.3 C thiab 3.92 MPa.TFE khaws cia ua kua;vapor siab ntawm 20 C yog 1 MPa.Nws cov cua sov ntawm kev tsim tau tshaj tawm tias yog 151.9 kcal / mole.Polymerization ntawm TFE yog exothermic heev thiab generates 41.12 kcal / mole heatd qhov uas yuav muab piv nrog cov heats ntawm polymerization ntawm vinyl chloride thiab styrene, ntawm 23-26 kcal / mole thiab 16.7 kcal / mole, feem.
Kev nyab xeeb cia ntawm TFE xav kom nws cov ntsiab lus oxygen tsawg dua 20 ppm.Kub thiab siab yuav tsum tau tswj thaum nws cia.Ua kom qhov kub thiab txias, tshwj xeeb tshaj yog thaum muaj kev kub ntxhov, tuaj yeem pib deflagration thaum tsis muaj cua (TFE degrades rau carbon tetrafluoride).Nyob rau hauv lub xub ntiag ntawm huab cua los yog oxygen, TFE tsim explosive sib tov nyob rau hauv lub molar feem pua ntawm 14-43%.Detonation ntawm kev sib xyaw ntawm TFE thiab oxygen tuaj yeem ua rau siab tshaj plaws rau 100 npaug ntawm qhov pib siab.
Cov khoom ntawm Hexafluoropropylene
Hexafluoropropylene yog cov tsis muaj xim, tsis muaj ntxhiab, tsis qab, thiab tsis tshua muaj toxicity gas, uas boils ntawm 29.4 C thiab khov ntawm 156.2 C. Hauv 4-teev raug, qhov concentration ntawm 3000 ppm sib haum rau LC50 hauv nas.Qhov kub thiab txias tseem ceeb ntawm HFP yog 85 C thiab 3254 MPa.Tsis zoo li TFE, HFP yog qhov ruaj khov heev nrog kev hwm rau autopolymerization thiab tuaj yeem khaws cia hauv cov kua hauv lub xeev yam tsis muaj kev sib ntxiv ntawm telogen.HFP yog thermally ruaj khov mus txog 400e500 C. Thaum txog 600 C nyob rau hauv lub tshuab nqus tsev, nws decomposes thiab tsim octafluoro-2-butene (CF3CF¼CFCF3) thiab octa-fluoroisobutylene.
Cov khoom ntawm Perfluoroalkyl Vinyl Ethers
Perfluoroalkyl vinyl ethers (PAVE) tsim cov chav kawm tseem ceeb ntawm cov monomers uas lawv yog cov comonomers xaiv rau "kev hloov kho" ntawm cov khoom ntawm homofluoropolymers ntxiv rau kev siv dav hauv cov qauv ntawm copolymer ntawm TFE.Qhov madvantage ntawm PAVEs li modifiers tshaj HFP yog lawv cov thermal stability zoo kawg li.Ib qho piv txwv tseem ceeb ntawm kev lag luam yog per-fluoropropyl vinyl ether (PPVE).PPVE yog cov kua uas tsis muaj ntxhiab, tsis muaj xim ntawm chav tsev kub.Nws yog heev flammable thiab burns nrog ib tug tsis muaj kob nplaim taws.Nws muaj tshuaj lom tsawg dua li HFP.
Cov khoom ntawm Chlorotrifluoroethylene
Chlorotrifluoroethylene yog cov roj tsis muaj xim ntawm chav tsev kub thiab siab.Nws yog qhov muaj kuab heev nrog LC50 (rat) ntawm 4-teev raug thiab qhov concentration ntawm 4000 ppm.Nws muaj qhov kub thiab txias ntawm 105.8 C thiab 4.03 MPa.Oxygen thiab kua CTFE teb thiab tsim peroxides ntawm qhov kub thiab txias.Ntau cov khoom siv oxygenated, xws li chlorodifluoroacetylfluoride, yog tsim los ntawm oxidation ntawm CTFE.Tib cov tshuaj tiv thaiv tuaj yeem tshwm sim photochemically nyob rau theem vapor.Chlorotrifluoroethylene oxide yog cov khoom siv los ntawm cov tshuaj tiv thaiv no.Cov peroxides ua raws li cov thawj coj rau lub polymerization ntawm CTFE, uas tuaj yeem tshwm sim hnyav.
Cov khoom ntawm Vinylidene Fluoride
Vinylidene fluoride, (CH2¼CF2), yog [49] flammable thiab yog ib qho roj ntawm chav tsev kub.Nws yog xim tsis muaj xim thiab yuav luag tsis muaj ntxhiab thiab boils ntawm 84 C. VDF tuaj yeem tsim cov khoom tawg nrog cua.Polymerization ntawm cov roj no yog exothermic heev thiab yuav siv qhov chaw siab tshaj nws qhov kub thiab txias.
Cov khoom ntawm Vinyl Fluoride
Vinyl fluoride (75-02-5) (fluoroethene) yog cov roj tsis muaj xim ntawm qhov chaw ib puag ncig.Nws yog flammable nyob rau hauv huab cua ntawm qhov txwv ntawm 2.6 thiab 22% los ntawm ntim.Qhov ntsuas kub tsawg kawg nkaus rau VF thiab huab cua sib tov yog 400 C. Ntxiv cov kab (<0.2%) ntawm terpenes yog qhov zoo los tiv thaiv kev ua haujlwm ntawm VF spontaneous polymerization.Inhibited VF tau raug cais raws li cov pa hluav taws xob los ntawm US Department of Transportation.
Post lub sij hawm: May-10-2018