Low-density polyethylene (LDPE) ndeye thermoplastic yakagadzirwa kubva kumonomer ethylene.Yakanga iri giredhi rekutanga re polyethylene, rakagadzirwa muna 1933 neImperial Chemical Industries (ICI) vachishandisa yakakwira kudzvanywa maitiro kuburikidza nemahara radical polymerization.EPA inofungidzira 5.7% yeLDPE inoshandiswa patsva.Kunyangwe kukwikwidza kubva kune mamwe mazuvano mapolymers, LDPE inoramba iri yakakosha giredhi repurasitiki.
LDPE inotsanangurwa nehuwandu hwehuwandu hwe0.910-0.940 g/cm3.Haisi reactive pane tembiricha yemumba, kunze kwekunge yakasimba oxidizing agents, uye zvimwe zvinonyungudutsa zvinokonzera kuzvimba.Inogona kumira tembiricha ye80 °C nguva dzose uye 95 °C kwenguva pfupi.Yakagadzirwa mu translucent kana opaque misiyano, inoshanduka uye yakaoma.
LDPE ine branching yakawanda kupfuura HDPE, saka masimba ayo e-intermolecular haana simba, simba rayo rekusimba rakaderera, uye kusimba kwayo kwakakwirira.Zvakare, nekuti mamorekuru ayo haanyanyi kurongedzerwa uye kushoma crystalline nekuda kwematavi eparutivi, kuwanda kwayo kwakadzikira.
PTFE inonzi thermoplastic polymer, iri chena yakasimba patembiricha yemumba, ine density inoita 2200 kg/m3.Maererano neDuPont, kunyungudika kwayo i600 K (327 °C; 620 °F).[19]Inochengetedza simba repamusoro, kuomarara uye kuzvigadzika patembiricha yakaderera kusvika pa5 K (−268.15 °C; -450.67 °F), uye kuchinjika zvakanaka patembiricha iri pamusoro pe194 K (-79 °C; -110 °F).PTFE inowana zvivakwa zvayo kubva paaggregate mhedzisiro yecarbon-fluorine bond, sezvinoita ese mafluorocarbons.Iwo ega makemikoro anozivikanwa kukanganisa aya kabhoni-fluorine zvisungo simbi dzinoshanda zvakanyanya senge alkali simbi, uye pakupisa kwepamusoro zvakare simbi sealuminium nemagnesium, uye fluorinating agents senge xenon difluoride uye cobalt (III) fluoride.
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Material Applications:
PTFE:Cabling mhinduro; Mabhengi asina kuzorwa; O-mhete; Zvisimbiso; Capacitors; Semiconductor kugadzira; Tembiricha yepamusoro yemagetsi zvikamu; Gaskets; Valve components.
LDPE:Matireyi nemidziyo yezvinangwa zvakajairika;Nzvimbo yebasa isingadziviriri; Zvikamu zvemakombuta, senge hard disk drive, makadhi esikirini, uye optical disc madhiraivha.
Material Properties
PTFE:Yakanakisa dielectric zvivakwa; Kusagadzikana kune akawanda makemikari; Kupisa kwakanyanya uye makemikari kuramba; Yakanyanya kuderera coeffiecient yekukweshana; Yakanakisa nemwaranzi kuramba; Zero mwando kutorwa; Zvishoma kusanzwa kune simba frequency; Machinability.
LDPE:Isingadzokeri patembiricha yemumba;Inokwanisa kushingirira tembiricha ye80 °C nguva dzose;Machinability.
Nguva yekutumira: Nov-01-2017