PTFE muaj cov khoom zoo xws li tshuaj lom neeg inertness, tshav kub tsis kam (ob qho tib si siab thiab qis), hluav taws xob rwb thaiv tsev, tsis tshua muaj coefficient ntawm kev sib txhuam (static 0.08 thiab dynamic 0.01), thiab cov khoom tsis muaj zog tshaj qhov kub ntau (260 txog 260 C).Nws muaj qhov ntom ntom ntawm 2.1e2.3 g / cm3 thiab yaj viscosity hauv thaj tsam ntawm 1e10 GPa persecond.Molecular hnyav ntawm PTFE tsis tuaj yeem ntsuas los ntawm cov qauv txheej txheem.Hloov chaw, txoj hauv kev tsis ncaj yog siv los txiav txim qhov hnyav molecular.Standard specific gravity (SSG) yog qhov tshwj xeeb lub ntiajteb txawj nqus ntawm ib nti npaj raws li tus txheej txheem txheem.Lub hauv paus ntsiab lus yog tias qhov hnyav molecular PTFE crystallizes ntau dua, yog li yielding ntau dua SSG qhov tseem ceeb.
PTFE uas tsis tau melted yav tas los muaj ib tug crystallinity ntawm 92e98%, qhia ib tug linear thiab nonbranched molecular qauv.Thaum ncav cuag 342 C, nws yaj hloov los ntawm cov xim dawb chalky rau hauv pob tshab amorphous gel.Qhov thib ob melting point ntawm PTFE yog 327 C vim hais tias nws yeej tsis recrystallizes rau tib yam li ua ntej nws thawj melting.
Kev txiav txim thawj zaug thiab kev txiav txim thib ob tau tshaj tawm rau PTFE.Cov kev hloov pauv uas nyob ze rau ntawm chav tsev kub yog qhov kev txaus siab rau kev siv vim muaj kev cuam tshuam rau kev ua cov khoom siv.Hauv qab 19 C lub crystalline system ntawm PTFE yog ib qho yuav luag zoo meej triclinic.Tshaj 19 C, chav tsev cell hloov mus rau hexagonal.Nyob rau hauv qhov ntau ntawm 19e30 C, cov ntu ntu tau nce zuj zus thiab qhov kev xav tau crystallographic ploj mus, ua rau muaj kev nthuav dav loj hauv cov ntim tshwj xeeb ntawm PTFE (1.8%) uas yuav tsum tau txiav txim siab hauv kev ntsuas qhov ntev ntawm Marticles ua los ntawm cov yas no.
PTFE yog nyob deb ntawm cov tshuaj tiv thaiv zoo tshaj plaws ntawm cov thermoplastics.Cov kev zam suav nrog cov hlau alkali molten, gaseous fluorine ntawm qhov kub thiab txias, thiab ob peb cov organic halogenated tebchaw xws li chlorine trifluoride (ClF3) thiab oxygen difluoride (OF2).Ob peb lwm yam tshuaj tau tshaj tawm los tawm tsam PTFE ntawm lossis ze rau nws qhov kub thiab txias.PTFE reacts nrog 80% sodium los yog poov tshuaj hydroxide thiab qee qhov muaj zog Lewis hauv paus nrog rau cov hlau hydrides.
Cov khoom siv kho tshuab ntawm PTFE feem ntau tsis zoo rau engineering plastics ntawm chav tsev kub.Compounding nrog fillers yog lub tswv yim los kov yeej qhov tsis txaus no.PTFE muaj cov cuab yeej siv tau zoo hauv nws qhov kev siv kub ntau.
PTFE muaj cov khoom siv hluav taws xob zoo xws li kev rwb thaiv tsev siab, tsis tshua muaj hluav taws xob tsis tu ncua (2.1), thiab tsis tshua muaj qhov cuam tshuam.Dielectric tas li thiab dissipation yam tseem zoo li tsis hloov nyob rau hauv thaj tsam ntawm 40 mus rau 250 C thiab 5 Hz rau 10 GHz.Dielectric tawg zog (lub sij hawm luv luv) yog 47 kV / mm rau 0.25-mm-thick zaj duab xis.Dielectric tawg lub zog yog txhim kho nrog txo qis hauv voids hauv PTFE, uas cuam tshuam los ntawm cov txheej txheem fabrication.PTFE raug tawm tsam los ntawm hluav taws xob, thiab degradation hauv huab cua pib ntawm koob tshuaj 0.02 Mrad.
Post lub sij hawm: Apr-14-2018