PVDF resists feem ntau cov organic thiab inorganic tshuaj nrog rau cov kuab tshuaj chlorinated.Poly (vinyl fluoride) yog ib tug semicrystalline polymer nrog ib tug planar, zigzag conformation.Cov degree ntawm crystallinity tuaj yeem sib txawv ntawm 20 mus rau 60% thiab yog ib qho kev ua haujlwm ntawm cov qauv tsis xws luag.
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PVDF Properties
Polyvinylidene fluoride yog ib tug semicrystalline polymer (35e70% crystallinity) nrog ib tug txuas zigzag chain.Head-to-tail ntxiv ntawm VDF dominates tab sis muaj headto-head lossis tail-to-tail tsis xws luag uas cuam tshuam rau crystallinity thiab cov khoom ntawm PVDF.
PVDF muaj ntau qhov kev hloov pauv thiab nws qhov ceev hloov pauv rau txhua lub xeev polymorph.Muaj plaub lub xeev tau hais tseg, npe hu ua a, b, g, thiab d.Cov theem feem ntau yog a-PVDF uas nthuav tawm kev hloov pauv ntawm 70 C (g), 38 C (b), 50 C (a”), thiab 100 C (a').
PVDF resists feem ntau cov organic thiab inorganic tshuaj nrog rau cov kuab tshuaj chlorinated.Lub hauv paus muaj zog, amines, esters, thiab ketones tawm tsam cov khoom no.Qhov cuam tshuam yog los ntawm qhov o mus rau qhov ua tiav ntawm cov kuab tshuaj no nyob ntawm qhov xwm txheej.PVDF nthuav qhia kev sib raug zoo nrog ntau cov polymers.Kev lag luam muaj txiaj ntsig zoo sib xyaw nrog acrylics thiab methacrylics tau tsim.
PVDF, ib yam li ETFE, tau nkag crosslinks los ntawm kev raug hluav taws xob.Radiation (gamma rays) muaj qhov cuam tshuam me me rau cov khoom siv hluav taws xob ntawm PVDF.
PVF Properties
Poly (vinyl fluoride) yog ib tug semicrystalline polymer nrog ib tug planar, zigzag conformation.Cov degree ntawm crystallinity tuaj yeem sib txawv ntawm 20 mus rau 60% thiab yog ib qho kev ua haujlwm ntawm cov qauv tsis xws luag.Kev lag luam PVF yog atactic, muaj kwv yees li 12% kev sib txuas ntawm lub taub hau mus rau lub taub hau, thiab qhia txog qhov siab tshaj plaws melting point ntawm txog 190 C.
PVF qhia ntau qhov kev hloov pauv hauv qab qhov ntsuas kub.Tg qis tshwm sim ntawm 15 txog 20 C thiab sab sauv Tg yog nyob rau hauv 40e50 C ntau.Ob qhov kev hloov pauv ntawm 80 C thiab 150 C tau tshaj tawm.
PVF muaj tsawg solubility nyob rau hauv tag nrho cov kuab tshuaj hauv qab no hais txog 100 C. Polymers nrog ntau dua solubility tau npaj siv 0.1% 2-propanol polymerization modifier thiab tau characterized nyob rau hauv N, N-dimethylformamide tov muaj 0.1 N LiBr.Mn ranged ntawm 76,000 mus rau 234,000 (osmometry), thiab Ms los ntawm 143,000 mus rau 654,000 (sedimentation tshaj tawm).
Qhov hnyav molecular PVF tau tshaj tawm kom degrade nyob rau hauv ib qho chaw inert, nrog concurrent HF poob thiab qaum pob txha cleavage tshwm sim ntawm txog 450 C. Nyob rau hauv huab cua, HF poob tshwm sim ntawm txog 350 C, ua raws li cov pob txha cleavage nyob ib ncig ntawm 450 C.
PVF yog pob tshab rau hluav taws xob hauv UV, pom, thiab ze-infrared cheeb tsam, xa 90% ntawm cov hluav taws xob los ntawm 350 mus rau 2500 nm.PVF dhau los ua embrittled thaum raug hluav taws xob-beam hluav taws xob ntawm 1000 Mrad tab sis tiv thaiv kev tawg ntawm cov koob tshuaj qis dua.Nws khaws nws lub zog ntawm 32 Mrad thaum PTFE degraded ntawm 0.2 Mrad.
Qhov ntsuas kub ntawm tus kheej ntawm PVF zaj duab xis yog 390 C. Qhov limiting oxygen index (LOI) rau PVF yog 22.6%.HF thiab kev sib xyaw ntawm cov tshuaj tsw qab thiab aliphatic hydrocarbons yog tsim los ntawm thermal degradation ntawm PVF.
Post lub sij hawm: Apr-04-2018