Kemikari zvimiro zveFEP zvakafanana neiyo yePTFE nePFA.
PFA Properties
PFA polymers yakazara fluorinated uye inonyunguduka-inogadziriswa.Vane makemikari kuramba uye kugadzikana kwekupisa kunofananidzwa nePTFE.Yakananga gravity ye perfluoroalkoxy resins iri muhuwandu hwe 2.12e2.17.PFA ine tembiricha yekuenderera mberi kwekushandisa kwe260 C.
Crystallinity uye chaiyo inokwevera yezvikamu zvePFA inodzikira kana kutonhora kwepolymer yakanyungudutswa kuchiwedzerwa.Iyo yakaderera crystallinity yakawanikwa nekudzima PFA yakanyungudutswa muaizi yaive 48% (chaiyo giravhiti 2.123).
Zvakafanana nePTFE, molecular huremu hwePFA haugone kuyerwa nemaitiro akajairwa.Chinhu chisina kunanga chinonzi melt flow rate (MFR) inonziwo melt flow index (MFI) inoshandiswa inova huwandu hwepolymer kunyunguduka kwaizoyerera nemucapillary rheometer pane imwe tembiricha pasi pemutoro wakatsanangurwa (kazhinji mumagiramu mumaminitsi gumi) .MFR inopindirana zvakanyanya kune viscosity;viscosity yakaenzana zvakananga kune molecular huremu hwepolymer.
PFA inoratidzira imwe yekutanga-odha shanduko pa5 C mukupesana nematembiricha maviri ePTFE pa19 uye 30 C. Iine matatu echipiri-yekurongeka shanduko pa100, 30 uye 90 C.
PFA ine yakanakisa magetsi emagetsi senge yakakwira insulation kuramba, yakaderera dielectric kugara (2.1), uye yakaderera dissipation chinhu.Dielectric constant uye dissipation factor inoramba isina kushanduka muhuwandu hwe40 kusvika 250 C uye 102 Hz kusvika 2.4 1010 Hz.Dielectric breakdown simba (nguva pfupi) ndeye 80 kV/mm yefirimu 0.25-mm-gobvu.
Mishonga yemakemikari yePFA yakafanana neiyo yePTFE.PFA inorwiswa nemwaranzi, uye kuora kwemhepo kunotanga pamwero wakakwirira kudarika wePTFE unotanga kuderera pa 0.02 Mrad.
FEP Properties
Fluorinated ethylene-propylene copolymers yakazara fluorinated uye inonyunguduka-inogadziriswa.Ivo vane yakanakisa makemikari kuramba uye kupisa kugadzikana.Yakananga gravity yeFEP resins iri muhuwandu hwe2.13e2.15.FEP ine tembiricha yepamusoro inoenderera mberi ye200 C.
Zvakafanana nePTFE, kurema kwema molecular eFEP hakugone kuyerwa nemaitiro akajairika.Kufanana nePFA, MFR inoshandiswa kuratidza huremu hwema molecular eFEP.MFR uye uremu hwemamorekuru hwakasiyana.
Kugovera huremu hwemamorekuru kunotemerwa nekuyera iyo dynamic module yepolymer melt uchishandisa rheological analyses.Crystallinity yemhandara (isina kunyungudutswa) FEP ndeye 65e75%.
FEP inoratidzira imwe yekutanga-odha shanduko inova nzvimbo yayo yekunyungudika.Relaxation tembiricha yeFEP inowedzera neHFP yemukati yecopolymer.FEP ine dielectric transition pa150 C iyo isingabatwe nemonomer composition kana crystallinity (specific gravity).
Kemikari zvimiro zveFEP zvakafanana neiyo yePTFE nePFA.
FEP inorwiswa nemwaranzi, uye kuora kwayo mumhepo kunotanga pachiyero che 0.2 Mrad (10 nguva dzakakwirira kupfuura yePTFE).
Nguva yekutumira: Mar-04-2018