Molecular Weight Dependency of Rheological Characteristics of Linear Low Density Polyethylene

1985 ◽  
Vol 29 (3) ◽  
pp. 323-334 ◽  
Author(s):  
D. Acierno ◽  
A. Brancaccio ◽  
D. Curto ◽  
F. P. La Mantia ◽  
A. Valenza
Keyword(s):  
Molecular Weight ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Rheological Characteristics ◽  
Linear Low Density Polyethylene

scholarly journals Different Dependence of Tear Strength on Film Orientation of LLDPE Made with Different Co-Monomer

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 434 ◽  
Author(s):  
Yi Ren ◽  
Ying Shi ◽  
Xuerong Yao ◽  
Yujing Tang ◽  
Li-Zhi Liu
Keyword(s):  
Molecular Weight ◽  
Crystal Orientation ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Machine Direction ◽  
Tear Strength ◽  
Similar Dependence ◽  
Similar Density ◽  
Shrinkage Property

Crystal orientations, tear strength and shrinkage of Linear Low-Density PolyEthylene (LLDPE) films made with different processes (compressed, cast and blown) were investigated. The films were made with three different LLDPE resins, respectively, which have similar density and molecular weight but are made with different comonomers (1-butene, 1-hexene and 1-octene), in order to investigate if tear strength in Machine Direction (MD) of the LLDPE films made with different comonomer has similar dependence on crystal orientation. Our study indicates that the films made of 1-hexene and 1-octene based LLDPE resins have significantly higher intrinsic tear strength and less decrease in MD tear strength for a given film orientation. That is, for a given orientation in MD, the MD tear drops dramatically for films made with butene-based resin but much less decrease for the films made with hexene and octene-based resins. The shrinkage property at high temperature shows a good correlation with crystal orientation and the fraction of the crystals melted at this temperature.

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