Mankhwala a FEP ndi ofanana ndi a PTFE ndi PFA.
PFA Properties
Ma polima a PFA ali ndi fluorinated kwathunthu ndipo amatha kusungunuka.Amakhala ndi kukana kwamankhwala komanso kukhazikika kwamafuta ofanana ndi PTFE.Mphamvu yokoka ya perfluoroalkoxy resins ili mumitundu ya 2.12e2.17.PFA ili ndi kutentha kosalekeza kosalekeza kwa 260 C.
Crystallinity ndi mphamvu yokoka ya magawo a PFA imatsika pamene kuzizira kwa polima wosungunuka kumawonjezeka.Kuwala kotsika kwambiri komwe kumapezeka pozimitsa PFA yosungunuka mu ayezi kunali 48% (kukokera kwapadera 2.123).
Mofanana ndi PTFE, kulemera kwa maselo a PFA sikungayesedwe ndi njira wamba.Chinthu chosalunjika chotchedwa melt flow rate (MFR) chomwe chimatchedwanso melt flow index (MFI) chimagwiritsidwa ntchito chomwe ndi kuchuluka kwa polima kusungunuka komwe kumadutsa mu capillary rheometer pa kutentha komwe kumaperekedwa pansi pa katundu wodziwika (nthawi zambiri mu magalamu mu mphindi 10). .MFR imagwirizana mosagwirizana ndi kukhuthala;mamasukidwe akayendedwe mwachindunji molingana ndi molecular kulemera kwa polima.
PFA ikuwonetsa kusintha koyambirira koyamba pa 5 C mosiyana ndi kutentha kuwiri kwa PTFE pa 19 ndi 30 C. Ili ndi maulendo atatu achiwiri pa 100, 30 ndi 90 C.
PFA ili ndi magetsi abwino kwambiri monga kukana kwamphamvu kwambiri, kutsika kwa dielectric (2.1), komanso kutsika kwapang'onopang'ono.Dielectric constant and dissipation factor imakhalabe yosasinthika mumitundu ya 40 mpaka 250 C ndi 102 Hz mpaka 2.4 1010 Hz.Mphamvu yakuwonongeka kwa dielectric (nthawi yochepa) ndi 80 kV/mm kwa filimu yokhuthala 0.25-mm.
Mankhwala a PFA amafanana ndi a PTFE.PFA amawukiridwa ndi ma radiation, ndipo kuwonongeka kwa mpweya kumayambira pa mlingo wapamwamba kwambiri kuposa wa PTFE womwe umayamba kutsika pa 0.02 Mrad.
Malipoti a malipoti a ndalama FEP Properties
Fluorinated ethylene-propylene copolymers ndi fluorinated kwathunthu ndi kusungunuka-processible.Iwo ali kwambiri kukana mankhwala ndi matenthedwe bata.Mphamvu yokoka ya FEP resins ili mumtundu wa 2.13e2.15.FEP ili ndi kutentha kosalekeza kwapamwamba kwa 200 C.
Mofanana ndi PTFE, kulemera kwa maselo a FEP sikungayesedwe ndi njira zamakono.Monga PFA, MFR imagwiritsidwa ntchito kusonyeza kulemera kwa maselo a FEP.MFR ndi kulemera kwa maselo ndizogwirizana.
Kugawa kwamphamvu kwa ma cell kumatsimikiziridwa ndikuyesa gawo losinthika la polima kusungunula pogwiritsa ntchito kusanthula kwa rheological.Crystallinity wa namwali (osasungunuka) FEP ndi 65e75%.
FEP ikuwonetsa kusintha kumodzi koyamba komwe ndi malo ake osungunuka.Kutentha kwa kupuma kwa FEP kumawonjezeka ndi HFP zomwe zili mu copolymer.FEP ili ndi kusintha kwa dielectric pa 150 C komwe sikumakhudzidwa ndi mawonekedwe a monomer kapena crystallinity (kukoka kwapadera).
Mankhwala a FEP ndi ofanana ndi a PTFE ndi PFA.
FEP imakhudzidwa ndi ma radiation, ndipo kuwonongeka kwake mumlengalenga kumayambira pa mlingo wa 0.2 Mrad (nthawi 10 kuposa PTFE).
Nthawi yotumiza: Mar-04-2018