Iipropati zePolymer-PVDF & PVF iiPropati

I-PVDF ixhathisa uninzi lweekhemikhali ze-organic kunye ne-inorganic kubandakanya izinyibilikisi ezineklorini.I-Poly(vinyl fluoride) yipolymer ene-semicrystalline eneplani, i-zigzag conformation.Iqondo le-crystallinity lingahluka kakhulu ukusuka kwi-20 ukuya kwi-60% kwaye ngumsebenzi wezakhiwo zesiphene.

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Iipropati zePVDF

I-Polyvinylidene fluoride yi-polymer ye-semicrystalline (35e70% crystallinity) kunye nekhonkco ye-zigzag eyandisiweyo.Ukongezwa kwentloko ukuya kumsila we-VDF kulawula kodwa kukho iziphene zentloko okanye umsila-umsila ochaphazela i-crystallinity kunye neempawu ze-PVDF.

I-PVDF inenani leenguqu kunye nokuxinana kwayo kuguqulo kwimeko nganye yepolymorph.Kukho iindawo ezine ezaziwayo ezicetywayo, ezibizwa ngokuba ngu-a, b, g, kunye no-d.Esona sigaba siqhelekileyo yi-a-PVDF ebonisa utshintsho kwi-70 C (g), 38 C(b), 50 C (a”), kunye ne-100 C (a').

I-PVDF ixhathisa uninzi lweekhemikhali ze-organic kunye ne-inorganic kubandakanya izinyibilikisi ezineklorini.Iziseko ezomeleleyo, ii-amines, ii-esters, kunye neeketoni zihlasela le resin.Impembelelo isukela ekudumbeni ukuya ekunyibilikeni ngokupheleleyo kwezi zinyibilikisi ngokuxhomekeke kwiimeko.I-PVDF ibonisa ukuhambelana nenani leepholima.Ukudibanisa okuluncedo kwezorhwebo kunye ne-acrylics kunye ne-methacrylics ziye zaphuhliswa.

I-PVDF, njenge-ETFE, idibanisa ngokukhawuleza ngenxa yokuvezwa kwimitha.Ukukhanya kwemitha (imitha ye-gamma) kunempembelelo ethobekileyo kwiipropati zomatshini wePVDF.

Iipropati zePVF

I-Poly(vinyl fluoride) yipolymer ene-semicrystalline eneplani, i-zigzag conformation.Iqondo le-crystallinity lingahluka kakhulu ukusuka kwi-20 ukuya kwi-60% kwaye ngumsebenzi wezakhiwo zesiphene.I-PVF yoRhwebo i-atactic, iqulethe malunga ne-12% yoqhagamshelwano olusuka kwintloko ukuya entloko, kwaye ibonisa indawo ekuyincopho yokunyibilika malunga ne-190 C.

I-PVF ibonisa iinguqulelo ezininzi ngaphantsi kobushushu obunyibilikayo.I-Tg ephantsi ivela kwi-15 ukuya kwi-20 C kunye ne-Tg ephezulu ikuluhlu lwe-40e50 C.Ezinye iinguqu ezimbini kwi-80 C kunye ne-150 C ziye zabikwa.

I-PVF ine-solubility ephantsi kuzo zonke i-solvents ezingezantsi malunga ne-100 C. Iipolymers ezine-solubility enkulu ziye zalungiswa ngokusebenzisa i-0.1% ye-2-propanol i-polymerization modifier kwaye ibonakaliswe kwi-N, N-dimethylformamide isisombululo esiqulethe i-0.1 N LiBr.Mn asusela kuma-76,000 ukuya kuma-234,000 (osmometry), kunye noNkskz ukusuka kwi-143,000 ukuya kuma-654,000 (i-sedimentation velocity).

Ubunzima obuphezulu be-molecular PVF bubikwa ukuba buhlazeke kwi-atmospheric engasebenzi, kunye nokulahleka kwe-HF kunye nokuqhekeka kwe-backbone okwenzeka malunga ne-450 C. Emoyeni, ukulahleka kwe-HF kwenzeka malunga ne-350 C, ilandelwa kukuqhekeka komqolo malunga ne-450 C.

I-PVF ibonakala ngokucacileyo kwimitha ye-UV, ebonakalayo, kunye nemimandla ekufutshane ne-infrared, ihambisa i-90% yemitha ukusuka kwi-350 ukuya kwi-2500 nm.I-PVF ichaphazeleka ekuvezweni kwimitha ye-electron-beam ye-1000 Mrad kodwa iyaxhathisa ukuqhekeka kwiidosi ezisezantsi.Igcina amandla ayo kwi-32 Mrad ngelixa i-PTFE iyancipha kwi-0.2 Mrad.

Ukushisa kwe-self-ignition yefilimu ye-PVF yi-390 C. Ukunciphisa i-oxygen index (LOI) ye-PVF yi-22.6%.I-HF kunye nomxube we-aromatics kunye ne-aliphatic hydrocarbons ziveliswa kwi-thermal degradation ye-PVF.