Ua like nā waiwai kemika o FEP me ka PTFE a me ka PFA.
PFA Waiwai
PFA polymers ua piha fluorinated a hehee-hana.Loaʻa iā lākou ke kūpaʻa kemika a me ke kūpaʻa wela e like me PTFE.Aia ka umekaumaha kiko'ī o nā resins perfluoroalkoxy ma ka laulā o 2.12e2.17.Loaʻa i ka PFA kahi wela hoʻohana mau o 260 C.
E emi ana ka crystallinity a me ka umekaumaha kiko'ī o nā ʻāpana PFA i ka wā e hoʻonui ʻia ai ka helu hoʻoluʻu o ka polymer hoʻoheheʻe.ʻO ka crystallinity haʻahaʻa loa i loaʻa ma ke kinai ʻana i ka PFA hoʻoheheʻe ʻia i ka hau he 48% (kaumaha kikoʻī 2.123).
E like me PTFE, ʻaʻole hiki ke ana ʻia ke kaumaha molekala o PFA e nā ʻenehana maʻamau.Hoʻohana ʻia kahi mea i kapa ʻia ʻo melt flow rate (MFR) i kapa ʻia ʻo melt flow index (MFI) ʻo ia ka nui o ka polymer melt e kahe ana ma kahi rheometer capillary ma kahi mahana i hāʻawi ʻia ma lalo o kahi haʻawe i wehewehe ʻia (maʻa mau i ka grams i 10 mau minuke). .Hoʻohālikelike ʻia ka MFR me ka viscosity;pili pono ka viscosity i ke kaumaha mole o ka polymer.
Hōʻike ka PFA i hoʻokahi hoʻololi kauoha mua ma 5 C me ka hoʻohālikelike ʻana me ʻelua mau wela no PTFE ma 19 a me 30 C. He ʻekolu kāna mau hoʻololi kauoha lua ma 100, 30 a me 90 C.
Loaʻa i ka PFA nā waiwai uila maikaʻi loa e like me ke kūpaʻa insulation kiʻekiʻe, haʻahaʻa dielectric mau (2.1), a me ka mea haʻahaʻa dissipation.ʻAʻole hoʻololi ka Dielectric mau a me ka dissipation kumu ma ka laulā o 40 a 250 C a me 102 Hz a 2.4 1010 Hz.ʻO ka ikaika dielectric breakdown (manawa pōkole) he 80 kV/mm no kahi kiʻiʻoniʻoni 0.25-mm-mānoanoa.
Kemika waiwai o PFA ua like me ka PTFE.PFA ua hooukaia e ka hahau, a me ka degradation i loko o ka lewa hoʻomaka ma kekahi ano kiekie ae ma mua o ka PTFE e hoomaka ana e degrade ma 0.02 Mrad.
Na Waiwai FEP
Fluorinated ethylene-propylene copolymers ua piha fluorinated a hehee-hana.Loaʻa iā lākou ke kūpaʻa kemika maikaʻi a me ke kūpaʻa wela.ʻO ka gravity kiko'ī o nā resins FEP aia ma ka laulā o 2.13e2.15.Loaʻa i ka FEP ka wela hoʻohana mau ʻana o 200 C.
E like me PTFE, ʻaʻole hiki ke ana ʻia ke kaumaha molekala o FEP e nā ʻenehana maʻamau.E like me PFA, hoʻohana ʻia ka MFR e hōʻike i ke kaumaha molekala o FEP.ʻO ka MFR a me ka paona molekala pili ʻole.
Hoʻoholo ʻia ka hāʻawi ʻana i ke kaumaha molekala ma ke ana ʻana i ka module dynamic o ka polymer melt me ka hoʻohana ʻana i nā loiloi rheological.ʻO ka crystallinity o ka puʻupaʻa (ʻaʻole i hoʻoheheʻe ʻia) FEP he 65e75%.
Hōʻike ʻo FEP i hoʻokahi hoʻololi kauoha mua ʻo ia kona wahi heheʻe.Piʻi ka mahana hoʻomaha o FEP me ka ʻike HFP o ka copolymer.Loaʻa i ka FEP kahi hoʻololi dielectric ma 150 C ʻaʻole i hoʻopilikia ʻia e ka haku mele monomer a i ʻole crystallinity (kaumaha kikoʻī).
Ua like nā waiwai kemika o FEP me ka PTFE a me ka PFA.
Hoʻouka ʻia ʻo FEP e ka radiation, a hoʻomaka kona hoʻohaʻahaʻa ʻana i ka ea ma kahi o 0.2 Mrad (10 mau manawa kiʻekiʻe ma mua o ka PTFE).
Ka manawa hoʻouna: Mar-04-2018