Lub crystallinity ntawm raw khoom siv yog 90 ~ 95 feem pua, thiab melting kub yog 327 ~ 342 degree.
Lub npe tshuaj ntawm cov khoom siv raw khoom yog polytetrafluoroethylene, thiab cov siv PTFE dawb zoo tib yam feem ntau siv hauv HVAC thiab cov dej xa dej thiab cov kav dej, thiab cov kav dej thiab lwm yam tshwj xeeb PTFE txoj siv sia, qhov tseeb, cov khoom siv tseem ceeb yog PTFE, tab sis qee cov txheej txheem. txawv.
Cov txheeb ze molecular pawg ntawm polytetrafluoroethylene loj, qis yog ntau pua txhiab, siab yog ntau tshaj kaum lab, feem ntau lab (polymerization degree nyob rau hauv qhov kev txiav txim ntawm 104, thaum polyethylene tsuas yog 103).
Feem ntau, cov crystallinity yog 90 ~ 95 feem pua , thiab lub melting kub yog 327 ~ 342 degree. CF2 chav tsev nyob rau hauv PTFE molecule yog teem nyob rau hauv ib tug zigzag duab, vim hais tias lub vojvoog ntawm lub fluorine atom yog me ntsis loj dua li ntawm hydrogen, yog li ntawd lub CF2 chav tsev nyob ib sab yuav tsis tau tag nrho oriented raws li trans cross-orientation, tab sis tsim ib tug kauv. -shaped twisted saw, thiab cov fluorine atom yuav luag npog tag nrho cov saw hlau polymer.
Cov qauv molecular no piav qhia ntau yam khoom ntawm PTFE. Thaum qhov kub thiab txias qis dua 19 degree, 13/6 kauv yog tsim; Ib theem hloov tshwm sim ntawm 19 degree thiab cov molecules unravel me ntsis, tsim ib tug 15/7 helix.