Muaj ob hom polypropylene tseem ceeb: homopolymers thiab copolymers. Cov copolymers kuj muab faib ua block copolymers thiab random copolymers.
Txhua pawg haum rau qee yam kev siv zoo dua li lwm pawg. Polypropylene feem ntau hu ua "hlau" ntawm kev lag luam yas vim muaj ntau txoj hauv kev uas nws tuaj yeem hloov kho lossis kho kom haum rau lub hom phiaj tshwj xeeb.
Feem ntau qhov no ua tiav los ntawm kev ntxiv cov khoom ntxiv tshwj xeeb rau nws lossis los ntawm kev tsim nws hauv txoj kev tshwj xeeb heev. Qhov kev hloov pauv no yog ib qho tseem ceeb heev.
Homopolymer polypropyleneyog qib siv dav dav. Koj tuaj yeem xav txog qhov no zoo li lub xeev qub ntawm cov khoom siv polypropylene.Cov tshuaj copolymer thaivpolypropylene muaj cov chav sib koom ua ke hauv cov blocks (uas yog, hauv tus qauv ib txwm muaj) thiab muaj qhov twg ntawm 5% txog 15% ethylene.
Ethylene txhim kho qee yam khoom, xws li kev tiv taus kev cuam tshuam thaum lwm cov khoom ntxiv txhim kho lwm yam khoom.
Cov tshuaj copolymer tsis sib xwspolypropylene - piv rau block copolymer polypropylene - muaj cov co-monomer units teeb tsa ua cov qauv tsis sib xws lossis random raws li polypropylene molecule.
Lawv feem ntau yog sib xyaw nrog txhua qhov chaw ntawm 1% txog 7% ethylene thiab raug xaiv rau cov ntawv thov uas xav tau cov khoom lag luam uas yooj yim dua thiab meej dua.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-05-2022