Txij li thaum nws muaj kev lag luam, kev tsim lub tswv yim ntawm Low-Density Polyethylene (LDPE) tau hloov pauv tsis tu ncua nyob ib puag ncig ntawm kev tswj hwm ntawm nws cov qauv molecular, kev ua tau zoo, thiab kev hloov pauv kom xaus- siv cov dej num, xav txog kev sib sib zog nqus los ntawm cov hauv paus ntsiab lus tshuaj mus rau engineering xyaum.Raws li thawj cov khoom siv polyolefin yuav tsum tau ua lag luam los ntawm kev siv hluav taws xob siab tshaj PE, tsis yog radical PE '{3} tsav los ntawm kev nrhiav cov neeg kho tshuab siab heev lossis kub ua haujlwm. Hloov chaw, nws tsom siv nws cov qauv tshwj xeeb ntawm cov qauv tsim los tsim cov yas ntau yam uas hloov tau yooj yim, pob tshab, yooj yim rau kev ua, thiab tus nqi- zoo, ua tau raws li qhov xav tau ceev ntawm ntim, kev ua liaj ua teb, kev tsim kho, thiab cov khoom siv niaj hnub rau cov khoom siv hnyav thiab hloov tau yooj yim.
Nyob rau theem tsim qauv molecular, lub ntsiab lus tseem ceeb ntawm LDPE yog ua kom cov saw hlau txuas ntxiv thiab cov kev cuam tshuam ntawm cov ethylene monomers thaum lub sij hawm cov saw loj hlob los ntawm kev siab -siab dawb radical polymerization, tsim ntau txoj hlua ntawm qhov ntev sib txawv. Qhov no random branching qauv cuam tshuam cov txheej txheem ntawm cov saw hlau molecular, txo cov crystallinity (kwv yees li 50% -60%), tso cai rau cov khoom kom muaj zog txaus thaum muaj qhov yooj yim thiab pob tshab. Nrog rau qhov ceev tswj nyob rau hauv qhov ntau ntawm 0.910-0.925 g / cm³, LDPE ua tiav ob qho tib si lub teeb yuag thiab zam qhov tsis muaj qhov tsis sib haum xeeb los ntawm kev muag muag ntau dhau. Qhov kev tsim no ntse sib npaug rigidity, toughness, thiab ua fluidity, muab qhov zoo tagnrho yaj tus cwj pwm rau cov txheej txheem tom ntej xws li tshuab tshuab, extrusion, thiab txhaj tshuaj molding.
Kev ua haujlwm -kev tsim qauv kev xav tau nthuav dav rau daim ntawv thov kev txhim kho ntawm LDPE. Nws cov ntsiab lus melting tsawg (kwv yees li 105-115 degree), qhov kub ua haujlwm dav dav, thiab lub zog yaj zoo ua kom siab - nrawm nrawm ntawm cov tshuab cua tshuab. Tsis tas li ntawd, cov yeeb yaj kiab nthuav tawm cov cua kub zoo heev- sealing thiab ductility, ua tau raws li qhov yuav tsum tau ua ntawm ob lub teeb yuag thiab kev ua haujlwm hauv kev ntim khoom noj, cov yeeb yaj kiab ua liaj ua teb, thiab lwm yam. Ib txhij, LDPE qhov tsis tshua muaj crystallinity ua kom muaj xim, luam ntawv, thiab lamination, tso cai rau cov neeg tsim qauv nthuav dav nws daim ntawv thov ciam teb hauv siab - kawg ntim thiab kho kom zoo nkauj los ntawm kev kho deg lossis lamination nrog lwm cov ntaub ntawv.
Kev tsim kho kom haum xeeb qhia txog kev sib sib zog nqus ntawm LDPE nrog qhov kawg -siv cov xwm txheej. Piv txwv li, nyob rau hauv kev ua liaj ua teb, los ntawm kev kho cov℃ntawm branching thiab molecular hnyav tis, lub teeb transmittance, tshav kub rwb thaiv tsev, thiab huab cua tsis kam ntawm zaj duab xis yuav optimized, ncaj qha mus rau cov kev xav tau ntawm cov qoob loo loj hlob. Nyob rau hauv kev lag luam cable, nws zoo heev hluav taws xob rwb thaiv tsev thiab yooj tso cai rau tsim ntawm nyias, yooj yim rwb thaiv tsev txheej los hloov mus rau complex thaiv ib puag ncig. Tsis tas li ntawd, lub tswv yim tsim kev rov ua dua tshiab ntawm LDPE tau hais ntxiv, txhim kho qhov muaj peev xwm ntawm kev rov ua dua tshiab los ntawm ib qho - xaiv cov khoom siv thiab cov qauv sib xyaw yooj yim, echoing cov hom phiaj kev txhim kho kom ruaj khov.
Zuag qhia tag nrho, lub tswv yim tsim ntawm tsawg- ntom polyethylene (LDPE) pib nrog cov qauv molecular innovation, tsom rau kev ua tau zoo thiab ua haujlwm tau zoo, thiab yog coj los ntawm kev lag luam xav tau thiab kev ruaj khov. Nws tau ua tiav zoo li cov khoom siv tseem ceeb ntawm kev lag luam ntau yam, thiab nws cov kev paub dhau los muab cov ntaub ntawv tseem ceeb rau cov phiaj xwm tsim thiab kev nthuav dav ntawm cov ntaub ntawv polyolefin tom ntej.