Izakhiwo ze-Polymer - PVDF & PVF Properties

I-PVDF imelana namakhemikhali amaningi e-organic kanye ne-inorganic kuhlanganise nezinyibilikisi ezine-chlorinated.I-Poly(vinyl fluoride) iyi-polymer e-semicrystalline ene-planar, i-zigzag conformation.Izinga le-crystallinity lingahluka kakhulu kusuka ku-20 kuya ku-60% futhi liwumsebenzi wezakhiwo ezinesici.

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Izakhiwo ze-PVDF

I-Polyvinylidene fluoride i-semicrystalline polymer (35e70% crystallinity) eneketango le-zigzag elinwetshiwe.Ukwengezwa kwekhanda kuya komsila kwe-VDF kuyabusa kodwa kukhona okungalungile kwekhanda lekhanda noma umsila kuya komsila okuthinta ukucwebezela kanye nezakhiwo ze-PVDF.

I-PVDF inenani loguquko futhi ukuminyana kuyashintsha kusimo se-polymorph ngasinye.Kunezifunda ezine ezaziwayo ezihlongozwayo, eziqanjwe ngokuthi a, b, g, kanye no-d.Isigaba esivame kakhulu i-a-PVDF ebonisa izinguquko ku-70 C (g), 38 C(b), 50 C (a”), kanye no-100 C (a').

I-PVDF imelana namakhemikhali amaningi e-organic kanye ne-inorganic kuhlanganise nezinyibilikisi ezine-chlorinated.Izisekelo ezinamandla, ama-amine, ama-ester, nama-ketones ahlasela le resin.Umthelela usukela ekuvuvukeni kuye ekuncibilikeni okuphelele kulezi zincibilikisi kuye ngezimo.I-PVDF ibonisa ukuhambisana nenani lama-polymer.Izingxube eziwusizo kwezohwebo nama-acrylics nama-methacrylics zenziwe.

I-PVDF, njenge-ETFE, ixhuma kalula ngenxa yokuchayeka emisebeni.Imisebe (imisebe ye-gamma) inomphumela onesizotha ezicini zemishini ze-PVDF.

Izakhiwo ze-PVF

I-Poly(vinyl fluoride) iyi-polymer e-semicrystalline ene-planar, i-zigzag conformation.Izinga le-crystallinity lingahluka kakhulu kusuka ku-20 kuya ku-60% futhi liwumsebenzi wezakhiwo ezinesici.I-PVF yezohwebo i-atactic, iqukethe cishe u-12% ukuxhumana phakathi kwekhanda nekhanda, futhi ibonisa indawo ephakeme yokuncibilika engaba ngu-190 C.

I-PVF ibonisa izinguquko ezimbalwa ngaphansi kwezinga lokushisa elincibilikayo.I-Tg ephansi ivela ku-15 kuya ku-20 C kanti i-Tg engenhla iba ku-40e50 C.Ezinye izinguquko ezimbili ku-80 C kanye ne-150 C zibikiwe.

I-PVF ine-solubility ephansi kuzo zonke izincibilikisi ezingezansi mayelana ne-100 C. Ama-Polymers ane-solubility enkulu alungiselelwe kusetshenziswa i-0.1% 2-propanol polymerization modifier futhi abonakaliswe kusixazululo se-N,N-dimethylformamide esiqukethe i-0.1 N LiBr.I-Mn isukela ku-76,000 kuya ku-234,000 (osmometry), kanti uNksz kusuka ku-143,000 kuya ku-654,000 (i-sedimentation velocity).

Isisindo samangqamuzana aphezulu i-PVF kubikwa ukuthi izokwehlisa isithunzi endaweni engasebenzi, ngokulahleka kwe-HF kanye nokuqhekeka komgogodla okwenzeka cishe ku-450 C. Emoyeni, ukulahlekelwa kwe-HF kwenzeka cishe ku-350 C, kulandelwa ukuqhekeka komgogodla cishe ku-450 C.

I-PVF ibonakala emisebeni ye-UV, ebonakalayo, neseduze ne-infrared, idlulisa u-90% wemisebe isuka ku-350 iye ku-2500 nm.I-PVF igxila ekuchayekeni emisebeni ye-electron-beam engu-1000 Mrad kodwa imelana nokuwohloka ngemithamo ephansi.Igcina amandla ayo ku-32 Mrad ngenkathi i-PTFE yehliswa ku-0.2 Mrad.

Izinga lokushisa lokuzishisa lefilimu ye-PVF lingu-390 C. I-limiting oxygen index (LOI) ye-PVF ingu-22.6%.I-HF kanye nengxube yama-hydrocarbon anephunga elimnandi ne-aliphatic kukhiqizwa ekonakalisweni okushisayo kwe-PVF.