Rheological behavior of metallocene catalyzed PE and LDPE blends
Liu, CY; Li, YY; Wang, J; He, JS; Zhang, L
AbstractThe rheological behavior was studied for blends of metallocene catalyzed ethylene/1-butene copolymer(mPE) and low density polyethylene(LDPE). Steady-state viscosity and dynamic viscoelasticity were measured by using a DSR-200 rheometer with parallel plate geometry. Non-linear fitting with the modified cross model was conducted successfully. Due to lower molecular weight and narrower molecular weight distribution ((M) over bar (w)/(M) over bar (n) = 2.1), mPE has a lower sensitivity to shear, shown by a lower zero shear viscosity, higher values of shear rate and shear stress at the transition from Newtonian to non-Newtonian behavior, higher viscosities in shear rate range from 10(0) s(-1) to 10(2) s(-1). Zero shear viscosities of mPE/LDPE 50/50 and 25/75 (mass ratio) blends have a large positive deviation from log-additivity rule, due to a decrease of the free volume fraction in these blends, The transition stress and non-Newtonian index decrease with increasing LDPE fraction in blends, which indicate that the blends have high sensitivity to shear and improved processability, The single correlation between G' and G " corresponds to the behavior expected for a miscible blend.
KeywordMetallocene Catalyzed Polyethylene Low Density Polyethylene(Ldpe) Rheological Behavior Blend
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WOS IDWOS:000167220600033
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLiu, CY
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Engn Plast, Beijing 100080, Peoples R China
2.Beijing Yanshan Petrochem Co Ltd, Resin Applicat Res Inst, Beijing 102500, Peoples R China
Recommended Citation
GB/T 7714
Liu, CY,Li, YY,Wang, J,et al. Rheological behavior of metallocene catalyzed PE and LDPE blends[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2001,22(2):298-302.
APA Liu, CY,Li, YY,Wang, J,He, JS,&Zhang, L.(2001).Rheological behavior of metallocene catalyzed PE and LDPE blends.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,22(2),298-302.
MLA Liu, CY,et al."Rheological behavior of metallocene catalyzed PE and LDPE blends".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 22.2(2001):298-302.
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