Abubuwan sinadarai na FEP sun yi kama da na PTFE da PFA.
PFA Properties
PFA polymers suna da cikakken fluorinated kuma suna narkewa.Suna da juriya na sinadarai da kwanciyar hankali na thermal kwatankwacin PTFE.Musamman nauyi na perfluoroalkoxy resins yana cikin kewayon 2.12e2.17.PFA yana da zazzabi mai ci gaba da amfani da sama na 260 C.
Crystallinity da takamaiman nauyi na sassan PFA suna raguwa lokacin da aka ƙãra adadin sanyaya na narkakkar polymer.Mafi ƙarancin crystallinity da aka samu ta hanyar kashe narkakkar PFA a cikin kankara shine 48% (ƙayyadaddun nauyi 2.123).
Kama da PTFE, ba za a iya auna nauyin kwayoyin PFA ta hanyar fasaha na al'ada ba.Ana amfani da wani abu na kai tsaye mai suna melt flow rate (MFR) wanda ake kira melt flow index (MFI) wanda shine adadin narkewar polymer wanda zai gudana ta cikin rheometer capillary a wani zafin da aka ba da shi a ƙarƙashin nauyin da aka ƙayyade (yawanci a cikin grams a cikin minti 10). .MFR ya bambanta da danko;danko kai tsaye yayi daidai da nauyin kwayoyin polymer.
PFA yana nuna sauyi na oda guda ɗaya a 5 C sabanin yanayin zafi biyu don PTFE a 19 da 30 C. Yana da sauyi uku na oda na biyu a 100, 30 da 90 C.
PFA yana da kyawawan kaddarorin lantarki kamar babban juriya mai ƙarfi, ƙarancin dielectric akai-akai (2.1), da ƙarancin ɓarna.Dielectric m da dissipation factor sun kasance kusan ba su canzawa a cikin kewayon 40 zuwa 250 C da 102 Hz zuwa 2.4 1010 Hz.Ƙarfin rushewar dielectric (gajeren lokaci) shine 80 kV / mm don fim mai kauri na 0.25-mm.
Abubuwan sinadarai na PFA sun yi kama da na PTFE. PFA ana kaiwa hari ta hanyar radiation, kuma lalacewa a cikin iska yana farawa da ɗan ƙaramin kashi fiye da na PTFE wanda ya fara raguwa a 0.02 Mrad.
Abubuwan da aka bayar na FEP
Fluorinated ethylene-propylene copolymers suna da cikakken fluorinated da narkewa-mai aiki.Suna da kyakkyawan juriya na sinadarai da kwanciyar hankali na thermal.Takamaiman nauyi na resin FEP yana cikin kewayon 2.13e2.15.FEP yana da babban ci gaba da amfani da zafin jiki na 200 C.
Kama da PTFE, ba za a iya auna nauyin kwayoyin FEP ta hanyar fasaha na al'ada ba.Kamar PFA, ana amfani da MFR don kwatanta nauyin kwayoyin FEP.MFR da nauyin kwayoyin suna da alaƙa da juna.
Ana ƙaddara rarraba nauyin kwayoyin halitta ta hanyar auna ma'auni mai ƙarfi na narke polymer ta amfani da nazarin rheological.Crystallinity na budurwa (ba a narke) FEP shine 65e75%.
FEP yana nuna sauyi guda ɗaya na oda na farko wanda shine wurin narkewa.Yanayin shakatawa na FEP yana ƙaruwa tare da abun ciki na HFP na copolymer.FEP yana da canjin dielectric a 150 C wanda ba shi da tasiri ta hanyar haɗin monomer ko crystallinity (ƙayyadaddun nauyi).
Abubuwan sinadarai na FEP sun yi kama da na PTFE da PFA.
FEP yana kaiwa hari ta hanyar radiation, kuma lalatarsa a cikin iska yana farawa a kashi 0.2 Mrad (sau 10 sama da na PTFE).
Lokacin aikawa: Maris-04-2018