Izici zamakhemikhali ze-FEP zifana nalezo ze-PTFE ne-PFA.
Izakhiwo ze-PFA
Ama-polymer e-PFA agcwele i-fluorinated futhi ayancibilika.Banokumelana kwamakhemikhali nokuzinza kokushisa okuqhathaniswa ne-PTFE.Amandla adonsela phansi athile ama-perfluoroalkoxy resins akububanzi obungu-2.12e2.17.I-PFA inezinga lokushisa eliphezulu lokusebenzisa okuqhubekayo elingu-260 C.
I-Crystallinity kanye namandla athile adonsela phansi ezingxenye ze-PFA kuncipha lapho izinga lokupholisa le-polymer encibilikisiwe lenyuka.I-crystallinity ephansi kakhulu etholwe ngokucisha i-PFA encibilikisiwe eqhweni yayingu-48% (amandla adonsela phansi athize 2.123).
Ngokufanayo ne-PTFE, isisindo samangqamuzana e-PFA asinakulinganiswa ngamasu avamile.Kusetshenziswa isici esingaqondile esibizwa ngokuthi i-melt flow rate (MFR) ebizwa nangokuthi inkomba yokugeleza kwe-melt (MFI) okuyinani lokuncibilika kwe-polymer elizogeleza ku-capillary rheometer ezingeni lokushisa elinikeziwe ngaphansi komthwalo ochaziwe (imvamisa ngamagremu emizuzwini eyi-10) .I-MFR ilingana ngokuphambene ne-viscosity;i-viscosity ilingana ngokuqondile nesisindo samangqamuzana e-polymer.
I-PFA ibonisa uguquko olulodwa lwe-oda lokuqala ku-5 C ngokungafani namazinga okushisa amabili e-PTFE ku-19 no-30 C. Inezinguquko ezintathu ze-second order ku-100, 30 kanye ne-90 C.
I-PFA inezinto zikagesi ezinhle kakhulu ezifana nokumelana nokushisa okuphezulu, ukungaguquki kwe-dielectric ephansi (2.1), kanye nesici esiphansi sokulahla.I-Dielectric constant and dissipation factor ihlala ingashintshile kububanzi obungu-40 kuya ku-250 C kanye no-102 Hz kuya ku-2.4 1010 Hz.Amandla okuqhekeka kwe-Dielectric (isikhathi esifushane) ngu-80 kV/mm ngefilimu enogqinsi ongu-0.25-mm.
Izakhiwo zamakhemikhali ze-PFA zifana nalezo ze-PTFE.PFA ihlaselwa imisebe, futhi ukuwohloka emoyeni kuqala ngethamo elithe xaxa kunalelo le-PTFE eliqala ukwehla ku-0.02 Mrad.
Izakhiwo ze-FEP
Ama-copolymers e-ethylene-propylene ane-fluorinated agcwele fluorinated futhi ayancibilika.Banokumelana okuhle kakhulu kwamakhemikhali kanye nokuzinza kokushisa.Amandla adonsela phansi aqondile ama-FEP resins akububanzi obungu-2.13e2.15.I-FEP inezinga lokushisa eliphezulu eliqhubekayo lokusebenzisa elingu-200 C.
Ngokufanayo ne-PTFE, isisindo samangqamuzana e-FEP asinakulinganiswa ngamasu avamile.Njenge-PFA, i-MFR isetshenziselwa ukukhombisa isisindo samangqamuzana e-FEP.I-MFR kanye nesisindo samangqamuzana kuhlobene ngokuphambene.
Ukusatshalaliswa kwesisindo samangqamuzana kunqunywa ngokulinganisa imojula eguquguqukayo yokuncibilika kwe-polymer kusetshenziswa ukuhlaziya kwe-rheological.I-Crystallinity ye-virgin (engancibiliki) FEP ingama-65e75%.
I-FEP ikhombisa inguquko ye-oda lokuqala okuyindawo yayo yokuncibilika.Izinga lokushisa lokuphumula le-FEP liyakhuphuka ngokuqukethwe kwe-HFP kwe-copolymer.I-FEP inoshintsho lwe-dielectric ku-150 C olungathintwa ukwakheka kwe-monomer noma i-crystallinity (i-gravity ethize).
Izici zamakhemikhali ze-FEP zifana nalezo ze-PTFE ne-PFA.
I-FEP ihlaselwa ngemisebe, futhi ukuwohloka kwayo emoyeni kuqala ngethamo lika-0.2 Mrad (izikhathi eziyi-10 eziphakeme kunezo ze-PTFE).
Isikhathi sokuthumela: Mar-04-2018