I-polyethylene yoxinaniso oluphantsi (LDPE) yi-thermoplastic eyenziwe kwi-ethylene ye-monomer.Yayiyinqanaba lokuqala le-polyethylene, eveliswe kwi-1933 yi-Imperial Chemical Industries (ICI) isebenzisa inkqubo yoxinzelelo oluphezulu nge-polymerization yamahhala.I-EPA iqikelela i-5.7% ye-LDPE iyarisayikilishwa.Ngaphandle kokhuphiswano oluvela kwiipholima zala maxesha, i-LDPE isaqhubeka ukuba libakala elibalulekileyo leplastiki.
I-LDPE ichazwa ngoluhlu loxinaniso lwe-0.910-0.940 g/cm3.Ayisebenzi kumaqondo obushushu begumbi, ngaphandle kwama-agent anamandla e-oxidizing, kwaye ezinye izinyibilikisi zibangela ukudumba.Iyakwazi ukumelana namaqondo obushushu angama-80 °C ngokuqhubekayo kunye nama-95 °C ixesha elifutshane.Yenziwe ngokuguquguqukayo okanye ukwahluka kwe-opaque, ibhetyebhetye kwaye yomelele.
I-LDPE ine-branching engaphezulu kune-HDPE, ngoko ke amandla ayo e-intermolecular abuthathaka, amandla ayo okuqina aphantsi, kwaye ukomelela kwayo kuphezulu.Kwakhona, ngenxa yokuba iamolekyuli zayo zincinci zipakishwe kwaye zingaphantsi kwekristale ngenxa yamasebe asecaleni, ubuninzi bayo buphantsi.
I-PTFE yipolymer ye-thermoplastic, eqinileyo emhlophe kwiqondo lobushushu begumbi, kunye noxinano malunga ne-2200 kg/m3.Ngokutsho kweDuPont, indawo yayo yokunyibilika ngama-600 K (327 °C; 620 °F).[19]Igcina amandla aphezulu, ukuqina kunye nokuzithambisa kumaqondo obushushu asezantsi ukuya kutsho ku-5 K (−268.15 °C; -450.67 °F), kunye nokuguquguquka okulungileyo kumaqondo obushushu angaphezu kwe-194 K (−79 °C; -110 °F).I-PTFE izuza iipropati zayo kwisiphumo esidityanisiweyo sebhondi ye-carbon-fluorine, njengazo zonke ii-fluorocarbons.Ekuphela kweekhemikhali ezaziwa ukuba zichaphazela ezi bhondi zekhabhoni-fluorine zizinyithi ezisebenza kakhulu njengeentsimbi zealkali, kwaye kumaqondo obushushu aphezulu ngokunjalo nezinyithi ezifana nealuminiyam nemagnesium, kunye neearhente zokuthambisa ezifana nexenon difluoride kunye necobalt(III) fluoride.
Izinto ezisetyenziswayo:
I-PTFE:Izisombululo zekhewubhuli;Iibheringi ezingathanjiswanga;Izangqa ze-O;Izitywina;IiCapacitors;Ukwenziwa kweSemiconductor;Amalungu ombane obushushu obuphezulu;Iigesi;amacandelo eValve.
I-LDPE:Iitreyi kunye nezikhongozeli zenjongo jikelele;Indawo yokusebenza ekwaziyo ukumelana nokubola;Iinxenye zehardware yekhompyutha, ezifana nehard disk drives, amakhadi esikrini, kunye needrive zediski zamehlo.
Iimpahla zeMathiriyeli
I-PTFE:Iipropathi ezigqwesileyo ze-dielectric; Ukungangeni kwiikhemikhali ezininzi; Ubushushu obuphezulu kunye nokumelana neekhemikhali; I-coefffiecient ephantsi kakhulu yokukhuhlana; Ukuchasana nemitha okugqwesileyo; Ukufunxa ukufuma kwe-Zero; Ngokuthelekiswa nokungakhathali kumaxesha ombane;Ubuchule.
I-LDPE:Ayisebenzi kumaqondo obushushu egumbi;Inokumelana namaqondo obushushu angama-80 °C ngokuqhubekayo;Ubuchule bokuchaneka.
Ixesha lokuposa: Nov-01-2017