Katundu wa Polymer - PVDF & PVF Properties

PVDF imalimbana ndi mankhwala ambiri achilengedwe komanso osakhazikika kuphatikiza zosungunulira za chlorinated.Poly(vinyl fluoride) ndi polima wa semicrystalline wokhala ndi planar, zigzag conformation.Mlingo wa crystallinity ukhoza kusiyana kwambiri kuchokera ku 20 mpaka 60% ndipo ndi ntchito ya zowonongeka.

pa

Zithunzi za PVDF

Polyvinylidene fluoride ndi semicrystalline polima (35e70% crystallinity) yokhala ndi unyolo wa zigzag wotalikirapo.Kuwonjezera kwa mutu ndi mchira wa VDF kumalamulira koma pali zolakwika zamutu kapena mchira ndi mchira zomwe zimakhudza crystallinity ndi katundu wa PVDF.

PVDF ili ndi masinthidwe angapo ndipo kachulukidwe kake kamasintha pamtundu uliwonse wa polymorph.Pali zigawo zinayi zodziwika, zotchedwa a, b, g, ndi d.Gawo lodziwika bwino ndi a-PVDF yomwe imawonetsa kusintha kwa 70 C (g), 38 C(b), 50 C (a”), ndi 100 C (a').

PVDF imalimbana ndi mankhwala ambiri achilengedwe komanso osakhazikika kuphatikiza zosungunulira za chlorinated.Maziko amphamvu, ma amine, esters, ndi ketoni amaukira utomoni uwu.Zotsatirazi zimachokera ku kutupa mpaka kusungunuka kwathunthu mu zosungunulirazi kutengera momwe zinthu zilili.PVDF imawonetsa kuyanjana ndi ma polima angapo.Zosakaniza zothandiza zamalonda ndi ma acrylics ndi methacrylics zapangidwa.

PVDF, monga ETFE, imadutsana mosavuta chifukwa chokhudzidwa ndi ma radiation.Radiation (gamma ray) imakhala ndi mphamvu zochepa pamakina a PVDF.

Zithunzi za PVF

Poly(vinyl fluoride) ndi polima wa semicrystalline wokhala ndi planar, zigzag conformation.Mlingo wa crystallinity ukhoza kusiyana kwambiri kuchokera ku 20 mpaka 60% ndipo ndi ntchito ya zowonongeka.Commercial PVF ndi atactic, imakhala ndi pafupifupi 12% yolumikizana ndi mutu ndi mutu, ndipo imawonetsa nsonga yosungunuka pafupifupi 190 C.

PVF imawonetsa masinthidwe angapo pansi pa kutentha kosungunuka.Tg yotsika imapezeka pa 15 mpaka 20 C ndipo Tg yapamwamba imakhala mu 40e50 C.Zosintha zina ziwiri pa 80 C ndi 150 C zanenedwa.

PVF ili ndi kusungunuka kochepa muzitsulo zonse zomwe zili pansipa za 100 C. Ma polima okhala ndi kusungunuka kwakukulu akonzedwa pogwiritsa ntchito 0.1% 2-propanol polymerization modifier ndipo amadziwika mu N, N-dimethylformamide njira yomwe ili ndi 0.1 N LiBr.Mn adachokera ku 76,000 mpaka 234,000 (osmometry), ndi Ms kuchokera 143,000 mpaka 654,000 (sedimentation velocity).

High molecular weight PVF imanenedwa kuti iwonongeke mumlengalenga, ndi kutayika kwa HF nthawi yomweyo ndi kuphulika kwa msana kunachitika pafupifupi 450 C. Mumlengalenga, kutaya kwa HF kumachitika pafupifupi 350 C, kutsatiridwa ndi kuphulika kwa msana kuzungulira 450 C.

PVF imawonekera ku radiation ya UV, yowoneka, komanso pafupi ndi infrared, imatumiza 90% ya ma radiation kuchokera ku 350 mpaka 2500 nm.PVF imakhazikika ikakhudzidwa ndi radiation ya electron-beam ya 1000 Mrad koma imakana kuwonongeka pamilingo yocheperako.Imakhalabe ndi mphamvu pa 32 Mrad pomwe PTFE idawonongeka pa 0.2 Mrad.

Kutentha kodziwotcha kwa filimu ya PVF ndi 390 C. The limiting oxygen index (LOI) ya PVF ndi 22.6%.HF ndi kusakaniza kwa ma hydrocarbon onunkhira ndi aliphatic amapangidwa kuchokera ku kuwonongeka kwa kutentha kwa PVF.