Qhov Tseem Ceeb Qhov txawv - Polyolefin vs Polyethylene
Ob leeg Polyolefin thiab Polyethylene yog cov khoom siv thermoplastic polymer. Qhov sib txawv tseem ceeb ntawm polyolefin thiab polyethylene yog polyolefin yog tsim los ntawm polymerization ntawm me me alkenes whereas polyethylene yog tsim los ntawm polymerization ntawm ethylene molecules. Polyethylene yog ib daim ntawv ntawm polyolefin. Qhov no yog vim polyethylene yog tsim los ntawm ethylene monomers; ethylene yog ib qho me me olefin compound.
YPolyolefin yog dab tsi?
Polyolefin yog cov khoom siv polymer ua los ntawm polymerization ntawm me me alkene compounds. Alkenes yog cov organic tebchaw uas muaj ib lossis ntau dua ob daim ntawv cog lus ntawm carbon atoms. Cov mis mos molecular ntawm alkene yog muab raws li CnH2n whereas n yog tus lej me, tag nrho. Thaum cov alkenes tsim cov polymers, lawv hu ua monomers.
Daim duab 01: Polypropylene yog ib qho piv txwv zoo rau Polyolefin
Piv txwv ntawm polyolefin tebchaw muaj xws li polyethylene (tsim los ntawm olefin ethylene), polypropylene (tsim los ntawm olefin propylene), polymethylpentane, thiab lwm yam. Nyob rau hauv industrial scale productions, cov polymers yog tsim nyob rau hauv lub xub ntiag ntawm catalyst xws li Ziegler-Natta catalyst.
YPolyethylene yog dab tsi?
Polyethylene yog ib qho khoom siv thermoplastic polymer uas tsim los ntawm ethylene monomers. Nws yog denoted los ntawm PE. Qhov rov ua dua ntawm PE yog (C2H4)n nrog qhov sib txawv "n" qhov tseem ceeb. Daim ntawv thov tseem ceeb tshaj plaws ntawm polyethylene yog raws li cov khoom ntim.
Daim duab 02: Rov Ua Haujlwm ntawm PE
YPolyethylene Grading
Muaj ntau qib ntawm polyethylene categorized raws li qhov ceev thiab lwm yam khoom ntawm cov khoom siv polymer.
- UHMW (ultra-high molecular weight PE)
- ULMW (ultra-low molecular weight PE)
- HDPE (siab ntom polyethylene)
- PEX (cross-linked polyethylene)
- LDPE (tsis tshua muaj polyethylene)
Khoom ntawm Polyethylene
Muaj ntau yam khoom tseem ceeb ntawm polyethylene; mechanical zog, thermal zog, tshuaj muaj zog, kho qhov muag khoom thiab hluav taws xob khoom.
- Cov khoom siv kho tshuab - tsis tshua muaj zog, tsis tshua muaj zog thiab nruj, siab ductility, siab cuam tshuam lub zog, tsis tshua muaj tseeb
- Cov khoom cua sov - lub ntsiab lus melting yog 80 ° Tab sis lub melting nws txawv nrog daim ntawv ntawm polyethylene
- Cov khoom siv tshuaj - PE yog nonpolar. Nws yog saturated hydrocarbon compound. Cov tshuaj tiv thaiv zoo heev, tsis muaj dej nqus, tsis muaj roj permeability, nkig thaum raug tshav ntuj ncaj qha
- Cov khoom kho qhov muag - feem ntau ntawm lub sijhawm, pob tshab. Yuav ua tau mis-opaque lossis opaque.
- Cov khoom hluav taws xob - hluav taws xob zoo hluav taws xob, taug qab ua haujlwm.
Daim ntawv thov ntawm polyethylene suav nrog feem ntau ua cov khoom ntim. Tsis tas li ntawd, HDPE yog siv rau tshuab moulding, txhaj molding, zaj duab xis ntau lawm, yeeb nkab ntau lawm, thiab lwm yam. LDPE yog siv tsuas yog rau zus tau tej cov films nyias, extrusion txheej, txhaj molding, hlau thiab cable productions, thiab lwm yam.
Dab tsi yog qhov Zoo sib xws ntawm Polyolefin thiab Polyethylene?
- Ob leeg Polyolefin thiab Polyethylene yog tsim los ntawm alkene monomers.
- Ob leeg yog cov khoom siv thermoplastic polymer.
- Ob leeg yog hydrocarbons.
Qhov txawv ntawm Polyolefin thiab Polyethylene yog dab tsi?
YPolyolefin vs Polyethylene |
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| Polyolefin yog cov khoom siv polymer ua los ntawm polymerization ntawm me me alkene compounds. | Polyethylene yog ib qho khoom siv thermoplastic polymer uas tsim los ntawm ethylene monomers. |
| Monomers | |
| Polyolefin yog tsim los siv me me alkenes li monomers. | Polyethylene yog tsim los siv ethylene ua monomers. |
| Qeb thiab piv txwv | |
| Polyethylene, polypropylene thiab polymethylpentane yog cov piv txwv zoo rau polyolefin. | High density PE, low density PE thiab ntau lwm pawg tuaj hauv qab polyethylene. |
Summary – Polyolefin vs Polyethylene
Polyolefin yog cov khoom siv polymer ua los ntawm me me alkene monomers. Polyethylene yog ib qho piv txwv zoo rau polyolefin. Qhov txawv ntawm polyolefin thiab polyethylene yog polyolefin yog tsim los ntawm polymerization ntawm alkenes whereas polyethylene yog tsim los ntawm cov polymerization ntawm ethylene molecules.
