Qhov sib txawv tseem ceeb ntawm PVDF thiab PTFE yog tias PVDF muaj qhov sib piv qis, qhov PTFE muaj qhov sib piv siab.
Lub sij hawm PVDF sawv cev rau polyvinylidene fluoride, thaum lub sij hawm PTFE sawv cev rau polytetrafluoroethylene. Ob qho no yog cov ntaub ntawv tseem ceeb hauv kev lag luam polymer uas muaj ntau ntawm monomer units.
PVDF yog dab tsi?
Lo lus PVDF sawv cev rau polyvinylidene fluoride. Cov khoom no yog ib qho uas tsis yog-reactive thermoplastic fluoropolymer. Peb tuaj yeem tsim cov khoom no los ntawm polymerization ntawm vinylidene difluoride. PVDF yog cov yas tshwj xeeb uas muaj txiaj ntsig zoo hauv cov ntawv thov uas peb xav tau siab purity thiab siab tiv thaiv rau cov kuab tshuaj, acids thiab hydrocarbons.
Daim duab 01: Rov ua dua Chav ntawm PVDF
Peb tuaj yeem pom cov khoom siv no ua lag luam muaj ntau yam ntawm cov khoom siv yeeb nkab, ntawv, raj, zaj duab xis, phaj, thiab cov khoom siv hluav taws xob rau cov xaim hwm. Ntxiv mus, peb tuaj yeem siv cov khoom no rau kev txhaj tshuaj, molding, lossis vuam, thiab nws yog cov khoom siv hauv tshuaj lom neeg, semiconductor, kev kho mob thiab kev tiv thaiv kev lag luam thiab tseem nyob hauv lithium-ion roj teeb. Tsis tas li ntawd, PVDF muaj nyob rau hauv crosslinked ze cell ua npuas ncauj uas muaj txiaj ntsig zoo hauv kev siv dav hlau thiab aerospace.
Thaum xav txog cov khoom tseem ceeb tshaj plaws ntawm PVDF, nws muaj qhov hloov pauv iav qis thiab feem ntau yog li 50-60% crystallinity. Nws muaj piezoelectric zog, uas los ntawm txhua yam stretching thiab poling nyob rau hauv cov txheej txheem nro. Muaj ntau hom PVDF, suav nrog alpha, beta, thiab gamma theem. Ntxiv mus, zoo ib yam li lwm cov ntaub ntawv fluoropolymer feem ntau, PVDF qhia rhiab heev rau cov hauv paus muaj zog, caustics, esters, ketones, thiab lwm yam.
PTFE yog dab tsi?
Lo lus PTFE sawv rau polytetrafluoroethylene. Txawm li cas los xij, peb feem ntau hu cov tshuaj no Teflon. PTFE muaj fluorocarbon units raws li rov qab units, thiab nws yog ib tug hluavtaws fluoropolymer. Tus qauv ntawm cov khoom no yog (C2F4)n.
Daim duab 02: Rov ua dua Chav ntawm PTFE
PTFE yog ib qho polymer uas muaj qhov hnyav molecular, tsuas yog cov pa roj carbon thiab fluorine atoms. Cov khoom no muaj nyob rau hauv lub xeev khov ntawm chav tsev kub. PTFE yog hydrophobic; Yog li, dej tsis tuaj yeem ntub nws saum npoo. Tsis tas li ntawd, cov khoom no yog lub npe hu ua cov khoom siv tsis zoo thiab muaj txiaj ntsig zoo hauv cov txheej txheem uas tsis yog-stick. Qhov no tsis-reactive xwm ntawm PTFE los ntawm lub zog ntawm C-F daim ntawv cog lus. Qhov no ua rau nws muaj txiaj ntsig zoo hauv kev tsim cov ntim khoom thiab cov kav dej. Tsis tas li ntawd, peb tuaj yeem siv cov khoom siv no ua cov roj nplua nyeem uas nws tuaj yeem txo kev sib txhuam thiab kev siv lub zog ntawm cov tshuab. Tsis tas li ntawd, cov khoom no tsis zoo soluble nyob rau hauv yuav luag tag nrho cov kuab tshuaj.
Txoj kev ntawm Teflon ntau lawm yog dawb-radical polymerization. Peb tuaj yeem ua Teflon los ntawm polymerizing tetrafluoroethylene. Txawm li cas los xij, cov txheej txheem tsim khoom no yuav tsum muaj cov cuab yeej tshwj xeeb vim tias tetrafluoroethylene nyiam tawg mus rau hauv tetrafluoromethane. Nws yog ib qho kev phom sij txaus ntshai.
Thaum xav txog cov khoom siv polymer, PTFE yog cov thermoplastic polymer. Nws tshwm sim raws li cov khoom dawb ntawm chav tsev kub. Qhov ceev ntawm cov khoom no yog hais txog 2200 kg / m3 Thaum qhov kub thiab txias, Teflon qhia tau hais tias muaj zog thiab tawv heev nrog nws tus kheej lubrication zog. Ntawm qhov kub thiab txias, nws muaj qhov hloov tau zoo thiab. Txij li cov khoom siv no tsis zoo heev, cov tshuaj lom neeg uas tuaj yeem ua rau muaj txiaj ntsig zoo rau nws suav nrog cov tshuaj lom neeg muaj zog xws li alkali hlau.
Qhov txawv ntawm PVDF thiab PTFE yog dab tsi?
PVDF thiab PTFE yog cov lus luv luv rau polyvinylidene fluoride thiab polytetrafluoroethylene, feem. Qhov sib txawv tseem ceeb ntawm PVDF thiab PTFE yog tias PVDF muaj qhov sib piv qis, qhov PTFE muaj qhov sib piv siab. Ntxiv mus, PVDF yog tsim los ntawm polymerization ntawm vinylidene difluoride, thaum PVDF yog tsim los ntawm dawb-radical polymerization.
Cov duab hauv qab no qhia qhov sib txawv ntawm PVDF thiab PTFE hauv daim ntawv teev npe.
Summary – PVDF vs PTFE
PVDF thiab PTFE yog cov lus luv luv rau polyvinylidene fluoride thiab polytetrafluoroethylene, feem. Qhov sib txawv tseem ceeb ntawm PVDF thiab PTFE yog tias PVDF muaj qhov sib piv qis, qhov PTFE muaj qhov sib piv siab.
