PTFE vs LDPE

Low-density polyethylene (LDPE) ndi thermoplastic yopangidwa kuchokera ku monomer ethylene.Inali kalasi yoyamba ya polyethylene, yopangidwa mu 1933 ndi Imperial Chemical Industries (ICI) pogwiritsa ntchito njira yopondereza kwambiri kudzera pa polymerization yaulere.EPA ikuyerekeza 5.7% ya LDPE yogwiritsidwanso ntchito.Ngakhale kupikisana ndi ma polima amakono, LDPE ikupitilizabe kukhala kalasi yofunikira ya pulasitiki.

LDPE imatanthauzidwa ndi kachulukidwe osiyanasiyana a 0.910-0.940 g/cm3.Sizochita pa kutentha kwa chipinda, kupatulapo ndi oxidizing amphamvu, ndipo zosungunulira zina zimayambitsa kutupa.Imatha kupirira kutentha kwa 80 °C mosalekeza ndi 95 °C kwakanthawi kochepa.Zopangidwa mosiyanasiyana kapena zowoneka bwino, zimakhala zosinthika komanso zolimba.

LDPE ili ndi nthambi zambiri kuposa HDPE, kotero mphamvu zake za intermolecular zimakhala zofooka, mphamvu zake zowonongeka ndizochepa, ndipo kulimba kwake kumakhala kokwezeka.Komanso, chifukwa mamolekyu ake sakhala odzaza kwambiri komanso osawoneka bwino chifukwa cha nthambi zam'mbali, kachulukidwe kake ndi kocheperako.

PTFE ndi polima thermoplastic, amene ndi woyera olimba kutentha firiji, ndi kachulukidwe za 2200 makilogalamu/m3.Malinga ndi DuPont, malo ake osungunuka ndi 600 K (327 °C; 620 °F).[19]Imasunga mphamvu zambiri, kulimba ndi kudzipaka paokha kutentha kwa 5 K (−268.15 °C; -450.67 °F), komanso kusinthasintha kwabwino pa kutentha pamwamba pa 194 K (−79 °C; -110 °F).PTFE imapindula ndi mphamvu zake kuchokera kumagulu a carbon-fluorine bond, monganso ma fluorocarbons onse.Mankhwala okhawo omwe amadziwika kuti amakhudza zomangira za carbon-fluorine ndi zitsulo zogwira ntchito kwambiri monga zitsulo za alkali, komanso kutentha kwambiri komanso zitsulo monga aluminiyamu ndi magnesium, ndi fluorinating agents monga xenon difluoride ndi cobalt (III) fluoride.

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Ntchito Zofunika:

PTFE:Cabling mayankho; Non mafuta fani; O-mphete; Zisindikizo; Capacitors; Semiconductor kupanga; High kutentha mbali magetsi; Gaskets; Vavu zigawo.

LDPE:Mathireyi ndi zotengera zomwe zimagwiritsidwa ntchito nthawi zonse;Pamalo ogwirira ntchito kuti zisachite dzimbiri;Magawo a zida zamakompyuta, monga ma hard disk drive, makadi owonekera, ndi ma optical disc drive.

Zinthu Zakuthupi

PTFE:Zinthu zabwino kwambiri za dielectric; Kusakhazikika kwamankhwala ambiri; Kutentha kwakukulu ndi kukana kwamankhwala; Coeffiecient yotsika kwambiri ya mikangano; Kukaniza bwino kwa ma radiation; mayamwidwe a zero; Kusamva mphamvu pafupipafupi; Kuchita bwino.

LDPE:Zosasunthika pazipinda zotentha; Imatha kupirira kutentha kwa 80 °C mosalekeza;Kutheka.