Nyob rau hauv cov nqe lus ntawm tshav kub tsis kam, polypropylene (PP) outperforms polyethylene (PE). Feem ntau, qhov melting point ntawm polypropylene yog li ntawm 40-50% siab dua li ntawm polyethylene -xws li ntawm 160℃mus rau 170℃- tso cai rau cov khoom kom tsis muaj menyuam ntawm qhov kub siab tshaj 100℃thiab nyob twj ywm undeformed ntawm 150℃nyob rau hauv tsis muaj lwm yam quab yuam. Hauv lub neej niaj hnub, "Tsis yog{10}}" cov thawv polypropylene feem ntau yog siv los ua cua sov zaub mov hauv microwave ncu (qhov kub feem ntau ncav cuag 100-140 degree), hos polyethylene tsis haum rau kev siv microwave-txawm yog rau cov thawv los yog cling film-vim nws cov cua sov tsis zoo. Ib yam li ntawd, hais txog cov txheej txheem ntim cov yeeb yaj kiab, cov hnab polyethylene yog qhov zoo tshaj plaws rau qhov kub hauv qab 90 degree, thaum lub hnab polypropylene tuaj yeem tiv taus qhov kub thiab txias.
Hais txog rigidity thiab tensile lub zog, polypropylene yog tus cwj pwm los ntawm tsawg ntom thiab superior txhua yam khoom piv rau polyethylene, tshwj xeeb tshaj yog nws tshwj xeeb rigidity. Polypropylene tau sib tw nrog engineering plastics (xws li PA thiab PC) thiab tau siv dav hauv cov khoom siv hluav taws xob, khoom siv hluav taws xob, thiab tsheb. Tsis tas li ntawd, nws lub zog tensile siab thiab zoo heev flexural kuj tau txais nws lub npe menyuam yaus "fold-cov yas resistant"; nws muaj peev xwm tiv taus ib lab dabtsi yog khoov voj voog yam tsis muaj kev ntxhov siab whitening ntawm lub quav. Cov yam ntxwv no yog ib qho kev qhia rau kev txheeb xyuas cov khoom siv polypropylene thiab ua raws li cov cim qhia rau kev txheeb xyuas lawv thaum rov ua dua.
Nyob rau hauv cov nqe lus ntawm qis -kub tsis kam, polypropylene yog qis dua polyethylene. Nws qhov cuam tshuam lub zog ntawm 0℃tsuas yog ib nrab ntawm qhov ntawm 20 degree, hos polyethylene tseem nyob ntawm qhov kub qis dua; nws qhov brittleness kub feem ntau yog qis dua -50℃thiab tuaj yeem poob qis li -140℃nyob ntawm qhov txheeb ze molecular mass. Yog li ntawd, yog hais tias ib yam khoom yog npaj rau siv nyob rau hauv ib tug tsawg-kub ib puag ncig, polyethylene yog cov nyiam raw khoom. Cov tais uas siv rau cov khoom noj hauv tub yees, piv txwv li, feem ntau yog ua los ntawm polyethylene.
Hais txog kev laus tiv thaiv, polypropylene yog qis dua polyethylene. Txawm hais tias lawv cov qauv molecular zoo sib xws, muaj cov methyl sab saw hauv polypropylene ua rau nws yooj yim rau oxidative degradation los ntawm ultraviolet lub teeb thiab tshav kub. Ib qho piv txwv ntawm cov khoom siv polypropylene ua rau muaj kev laus yog lub hnab woven; Kev raug tshav ntuj ntev ua rau cov hnab no tawg yooj yim. Qhov tseeb, thaum polyethylene muaj kev tiv thaiv kev laus zoo dua li polypropylene, nws qhov kev ua tau zoo hauv qhov no tsis zoo tshaj piv rau lwm cov ntaub ntawv; Lub xub ntiag ntawm kab ob daim ntawv cog lus thiab ether linkages nyob rau hauv polyethylene molecules ua rau huab cua tsis zoo, ua rau nws raug kev laus los ntawm lub hnub thiab los nag.
Nyob rau hauv cov nqe lus ntawm kev yooj yim, polypropylene muaj lub zog siab tab sis tsis yooj yim dua -los yog, technically hais, tsis zoo cuam tshuam. Yog li ntawd, nws daim ntawv thov txawv ntawm cov polyethylene, tshwj xeeb tshaj yog nyob rau hauv cov khoom ua yeeb yaj kiab; polypropylene zaj duab xis yog feem ntau siv rau ntim ntim thiab luam ntawv. Hais txog cov kav dej, tus qauv polypropylene tsis tshua siv ntawm nws tus kheej; Hloov chaw, hla - txuas polypropylene-feem ntau hu ua PPR- yog yuav tsum tau. Vim tias cov polypropylene zoo tib yam muaj kev cuam tshuam tsis zoo thiab ua rau tawg, cov khoom hloov pauv yuav tsum tau ntxiv rau cov kev siv tswv yim; Piv txwv li, cov khoom siv ntxiv yog siv los txhim kho kev cuam tshuam rau hauv cov khoom xws li tsheb bumpers.