siab ceev polyethylene molecular hnyav
Jan 05, 2024| Qhov hnyav dua molecular ua rau muaj viscosity ntawm polymer ntau dua, txawm hais tias viscosity kuj tseem cuam tshuam rau qhov ntsuas kub thiab shear tus nqi siv hauv qhov ntsuas. Qhia qhov hnyav molecular ntawm cov khoom siv rheological lossis molecular hnyav ntsuas. Cov qib HDPE feem ntau muaj qhov hnyav molecular ntau ntawm 40,000 txog 300,000, thiab qhov hnyav nruab nrab molecular hnyav hnyav sib haum rau qhov ntsuas qhov ntsuas kub, uas yog, los ntawm 100 mus rau 0.029g / 10min (230 degree, 2.16kg). Feem ntau, siab dua Mw (qis melt index MI) txhim khu lub zog yaj, zoo dua toughness thiab ESCR, tab sis siab dua Mw ua rau kev ua.
Cov txheej txheem nyuaj dua los yog xav tau siab dua lossis kub.
Molecular Weight Distribution (MWD): Lub WD ntawm PE txawv ntawm nqaim mus rau dav nyob ntawm cov catalyst siv thiab ua.
Qhov feem ntau siv MWD ntsuas ntsuas yog qhov ntsuas qhov tsis sib xws (HI), uas yog sib npaug rau qhov hnyav nruab nrab molecular hnyav (Mw) muab faib los ntawm tus lej nruab nrab molecular hnyav (Mn). Qhov ntsuas qhov ntsuas no rau txhua qib HDPE yog 4-30. Narrow MWD muab kev ua tsov rog tsawg thiab muaj kev cuam tshuam loj thaum lub sij hawm molding. Nruab nrab mus rau dav MWD muab cov txheej txheem rau feem ntau cov txheej txheem extrusion. Broad MWD kuj tseem txhim kho lub zog yaj thiab nkag siab tsis kam.