Dab tsi PTFE

Polytetrafluoroethylene (PTFE), muaj lub zog, tawv, tsis muaj rog, tsis hloovhluavtawscobtsim los ntawm covpolymerizationntawmtetrafluoroethyleneCov. Paub los ntawm cov cim lag luam xws li Teflon, Fluon, Hostaflon, thiab Polyflon, PTFE tau qhov txawv ntawm nws cov nplaim qhov muag, qhov chaw siab, thiab tiv thaiv kom tua los ntawm yuav luag txhua yam tshuaj lom neeg. Cov peev txheej no tau ua rau nws paub txog cov neeg siv khoom raws li cov xim ntawm nonstick cookware; nws kuj yog tsim rau hauv cov khoom lag luam, suav nrog cov kabmob, cov kab hluav taws xob, thiab qhov chaw rau cov li qub thiab twj.

PTFE tau nrhiav tau serendipitously hauv 1938 los ntawmRoy Plunkett, tus kws tshuaj Asmeskas rau EI du Pont de Nemours& Tuam Txhab (tam sim noDuPont Lub Tuam Txhab), uas pom tias lub tank ntawm cov roj tetrafluoroethylene tub yees muaj cov polymerized rau cov hmoov dawb. Lub sijhawm WarWorld War IIit tau thov los ua cov tshuaj tiv thaiv kev tiv thaiv kom tiv thaiv cov khoom siv hlau siv hauv kev tuav cov khoom siv hluav taws xob rau Kev Npaj Manthattan Rau ntau tshaj kaum tawm xyoo tom qab kev ua tsov ua rog, PTFE pom kev siv kev lag luam me me, vim kev nyuaj los ntsib hauv kev tsim qauv rau kev ua cov khoom nplua, cov khoom ua kom siab. DuPont tso nws lub npe ua lag luam Teflon-coatedtshuab tsis siv ntxuav muag hauv xyoo 1960.

Tetrafluoroethylene (C2F4), cov roj tsis muaj kob, tsis muaj ntxhiab, yog tsim los ntawm cua sov chlorodifluoromethane (CHClF2) hauv thaj tsam ntawm 600–700°C(1,100–1,300 ° F). Chlorodifluoromethane nyeg yog tau los ntawm reacting hydrogen fluoride (HF) withchloroform (CHCl3)). Tetrafluoroethylene monomers (me me, ib leeg-ib pawg lwg me me) raug tshem tawm lossis emulsified hauv dej thiab tom qab ntawd polymerized (txuas rau hauv loj heev, ntau pawg-lwg me me) nyob rau hauv siab siab nyob rau hauv qhov pib ntawm dawb-tshaj dhau pib. Thepolymerconsists ntawm cov saw hlau sib kab nrog cov twofluorineatoms sib khi rau txhua cov pa roj carbon:

Cov tshuaj fluorine atoms puag ncig cov pa roj carbon fiber zoo ib yam li kev thaiv lub hnab, tsim kom muaj cov thev naus laus zis sib xyaws thiab nrawm nrog cov roj carbon-fluorine ntau cov ntawv cog lus. Lub polymer yog qhov inert rau feem ntau cov tshuaj, tsis yaj hauv qab 327 ° C (620 ° F), thiab muaj qis tshaj qhov ua kom sib tshooj ntawm txhua yam kev paub. Cov cuab yeej no tso cai rau nws siv rau hav zoov thiab cov kabmob uas tsis tas yuav muaj cov roj nplua nyeem, raws li cov kab nrig rau cov khoom siv hauv kev khaws cia thiab kev thauj mus los ntawm cov kua qaub muaj zog thiab cov kuab tshuaj organic, raws li hluav taws xob rwb thaiv tsev nyob rau hauv qhov kub thiab txias, thiab hauv nws cov ntawv thov zoo li kev ua noj nto uas tsis tas yuav siv cov roj lossis roj.