Analytical scale supercritical fluid fractionation of a low molecular weight, high density polyethylene wax with carbon dioxide

1993 ◽  
Vol 16 (5) ◽  
pp. 279-284 ◽  
Author(s):  
Jim Via ◽  
Cheryl Braue ◽  
Larry T. Taylor
Keyword(s):  
Carbon Dioxide ◽  
Molecular Weight ◽  
Supercritical Fluid ◽  
High Density Polyethylene ◽  
High Density ◽  
Low Molecular Weight ◽  
Supercritical Fluid Fractionation ◽  
Polyethylene Wax ◽  
Analytical Scale

Effect of Low Molecular Weight Ethylene Homopolymer on Structure and Properties of Bimodal High Density Polyethylene

2012 ◽  
Vol 217-219 ◽  
pp. 603-608
Author(s):  
Xing Bo Shi ◽  
Ju Lin Wang ◽  
Xiao Ping Cai
Keyword(s):  
Molecular Weight ◽  
High Density Polyethylene ◽  
Gel Permeation Chromatography ◽  
High Density ◽  
Low Molecular Weight ◽  
Structure And Properties ◽  
Scanning Calorimetry ◽  
Processing Properties ◽  
Positive Effect ◽  
Properties Of Composites

The effect of low molecular weight (LMW) ethylene homoploymer on the structure and properties of bimodal high density polyethylene (HDPE) was studied by blending two commercial bimodal HDPE resins (tandem reactor) with two types of LWM ethylene homopolymer. The molecule weight and molecule weight distribution, crystsallinity, rheological and mechanical properties of composites were characterized by high temperature gel permeation chromatography (HT-GPC), differential scanning calorimetry (DSC), capillary rheometer respectively. For composites of bimodal HDPE and LMW ethylene homopolymer, the polydispersity index (PDI) and crystallinity can be effectively increased when reduce the molecular weight of first reactor in tandem reactor. The viscosity of composites decreases at high shear rate. Increasing of LMW component has a positive effect on processing properties and tensile strength, while makes composites brittle.

Study of the Nature of the Influence of some Oligophosphonates on the Rheological Properties of High-Density Polyethylene

2021 ◽  
Vol 899 ◽  
pp. 606-612
Author(s):  
Abubekir Kh. Shaov ◽  
Asya N. Beslaneeva ◽  
Gennady B. Shustov ◽  
Albina M. Altueva
Keyword(s):  
Molecular Weight ◽  
Rheological Properties ◽  
High Molecular Weight ◽  
High Density Polyethylene ◽  
Functional Group ◽  
High Density ◽  
Low Molecular Weight ◽  
Phosphorus Containing ◽  
Cyclic Compounds

High molecular weight compounds with organophosphorus backbones are usually obtained by polycondensation of phosphorus-containing monomers, leading, most often, to products of low molecular weight at low yields. This fact is explained [1] by several reasons: a decrease in the reactivity of the second functional group of the monomer after the first one has reacted; the possibility of the formation of cyclic compounds; hydrolytic instability of the phosphorus-heteroatom bond (usually P-O, P-N), etc.

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