Iipropati zeMichiza ye-FEP ziyafana nezo ze-PTFE kunye ne-PFA.
Iipropati zePFA
Iipolymers zePFA zigcwele ngokupheleleyo kwaye ziyanyibilika.Banokumelana neekhemikhali kunye nokuzinza kwe-thermal kuthelekiswa ne-PTFE.Ubunzima obuthile be-perfluoroalkoxy resins kuluhlu lwe-2.12e2.17.I-PFA inobushushu bokusebenzisa obuphezulu obungama-260 C.
ICrystallinity kunye nobunzima obuthile bamalungu ePFA ayancipha xa isantya sokupholisa sepolymer etyhidiweyo yonyuswa.Eyona crystallinity ephantsi efunyenwe ngokucima i-PFA etyhidiweyo kwiqhwa yayiyi-48% (umxhuzulane okhethekileyo we-2.123).
Ngokufana ne-PTFE, ubunzima bemolekyuli yePFA ayinakulinganiswa ngeendlela eziqhelekileyo.Into engathanga ngqo ebizwa ngokuba yi-melt flow rate (MFR) ekwabizwa ngokuba yi-melt flow index (MFI) isetyenziswa isixa se-polymer enyibilikayo esiya kuhamba nge-capillary rheometer kwiqondo lobushushu elinikiweyo phantsi komthwalo ochaziweyo (ngokuqhelekileyo kwiigram kwimizuzu eyi-10) .I-MFR ihambelana ngokungafaniyo ne-viscosity;i-viscosity ihambelana ngokuthe ngqo nobunzima bemolekyuli yepolymer.
I-PFA ibonisa ukutshintshwa kwe-oda lokuqala kwi-5 C ngokungafani namaqondo okushisa amabini kwi-PTFE kwi-19 kunye ne-30 C. Ineenguqu ezintathu zesibini kwi-100, i-30 kunye ne-90 C.
I-PFA ineempawu ezigqwesileyo zombane ezifana nokumelana nokugquma okuphezulu, ukungaguquguquki kwe-dielectric ephantsi (2.1), kunye ne-low dissipation factor.I-Dielectric rhoqo kunye ne-dissipation factor ihlala ingatshintshi kwi-40 ukuya kwi-250 C kunye ne-102 Hz ukuya kwi-2.4 1010 Hz.Amandla okuqhekeka kwe-dielectric (ixesha elifutshane) yi-80 kV/mm kwifilimu engqindilili ye-0.25 mm.
Iipropathi zeMichiza ye-PFA ziyafana nezo ze-PTFE.PFA zihlaselwa yimitha, kwaye ukuthotywa emoyeni kuqala ngedosi ethile ephezulu kunaleyo ye-PTFE eqala ukuthotywa kwi-0.02 Mrad.
Iipropati ze-FEP
I-ethylene-propylene copolymers ene-fluorinated i-fluorinated ngokupheleleyo kwaye iyanyibilika.Banokumelana okugqwesileyo kweekhemikhali kunye nokuzinza kwe-thermal.Ubunzima obucacileyo be-FEP resins kuluhlu lwe-2.13e2.15.I-FEP inobushushu obuphezulu bokusebenzisa obuqhubekayo be-200 C.
Ngokufana ne-PTFE, ubunzima bemolekyuli ye-FEP ayinakulinganiswa ngobuchule obuqhelekileyo.NjengePFA, i-MFR isetyenziselwa ukubonakalisa ubunzima be-molecular ye-FEP.I-MFR kunye nobunzima bemolekyuli bunxulumene ngokungafaniyo.
Ukuhanjiswa kobunzima bemolekyuli kumiselwe ngokulinganisa imodyuli eguquguqukayo yepolymer enyibilikayo kusetyenziswa uhlalutyo lwe-rheological.ICrystallinity yentombi enyulu (enganyibilikiyo) FEP yi 65e75%.
I-FEP ibonisa inguqu ye-oda yokuqala enye eyindawo yayo yokunyibilika.Ukufudumala kweqondo lokushisa kwe-FEP kwanda ngomxholo we-HFP we-copolymer.I-FEP inenguqu ye-dielectric kwi-150 C engathintekiyo ngokubunjwa kwe-monomer okanye i-crystallinity (i-gravity ethile).
Iipropati zeMichiza ye-FEP ziyafana nezo ze-PTFE kunye ne-PFA.
I-FEP ihlaselwa yi-radiation, kwaye ukuthotywa kwayo emoyeni kuqala kwi-dose ye-0.2 Mrad (i-10 amaxesha aphezulu kune-PTFE).
Ixesha lokuposa: Mar-04-2018