Additive interactions in the stabilization of film grade high-density polyethylene. Part I: Stabilization and influence of zinc stearate during melt processing

2002 ◽  
Vol 8 (2) ◽  
pp. 75-89 ◽  
Author(s):  
Aitor Parrondo ◽  
Norman S. Allen ◽  
Michele Edge ◽  
Christopher M. Liauw ◽  
Eusebio Fontán ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Zinc Stearate ◽  
Melt Processing ◽  
High Density ◽  
Additive Interactions

Additive interactions in the stabilization of film grade high-density polyethylene. Part II: Stabilization during long-term service

2002 ◽  
Vol 8 (2) ◽  
pp. 90-102 ◽  
Author(s):  
Aitor Parrondo ◽  
Norman S. Allen ◽  
Michele Edge ◽  
Christopher M. Liauw ◽  
Eusebio Fontán
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Additive Interactions

scholarly journals Homogeneously Dispersed Carbon Nanofiber/High-Density Polyethylene Nanocomposite Compatibilized by Dilakylimidazolium Tetrafluoroborate

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
J. Samuel ◽  
S. Al-Enezi ◽  
A. Al-Banna ◽  
G. Abraham
Keyword(s):  
Ionic Liquid ◽  
High Density Polyethylene ◽  
Carbon Nanofiber ◽  
Complex Viscosity ◽  
Melt Processing ◽  
High Density ◽  
Imidazolium Ionic Liquid ◽  
Rheological Analysis ◽  
Viscoelastic Parameters ◽  
Compatibilizing Agent

High-density polyethylene (HDPE) was used in this study as a matrix for accommodating carbon nanofiber (CNF) along with ionic liquid, to investigate the effect of nanofibers loading on the morphological thermal and rheological properties of the composites. The nanocomposite materials were prepared via melt processing using dilakylimidazolium tetrafluoroborate (ionic liquid) as a compatibilizing agent. The samples blended with imidazolium ionic liquid exhibited higher thermal stability, while DSC analysis showed the clear miscibility of ionic liquid in the HDPE matrix with a single endothermic peak. The influence of CNF (ranging from 0, 0.5, 1, and 2 wt.%) and ionic liquid concentration on the viscoelastic parameters was investigated. The rheological analysis showed the shear-thinning behavior of the composites. An improvement in the viscoelastic properties was observed as the nanofiber concentration increased. Composites blended with ionic liquid (HDPE/CNF/IL) exhibited slightly lower values of complex viscosity and modulus over the corresponding HDPE/CNF nanocomposites. Therefore, it is also significant that the reduction in melt viscosity is an additional benefit for polymer composite processing as a result of the wetting effect by polymer-ionic liquid combinations.

scholarly journals The Use of Solid State NMR to Characterize High Density Polyethylene/Organoclay Nanocomposites

2009 ◽  
Vol 3 (3) ◽  
pp. 187-190
Author(s):  
Tathiane Rodrigues ◽  
◽  
Maria Tavares ◽  
Igor Soares ◽  
Ana Moreira ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Relaxation Time ◽  
Solid State ◽  
Magnetic Resonance ◽  
High Density Polyethylene ◽  
Melt Processing ◽  
Proton Spin ◽  
High Density ◽  
Spin Lattice Relaxation ◽  
Nuclear Magnetic

Recently the development of new materials, in special polymeric nanocomposites, formed by polymer and layered silicates, have gained attention. In this work nanocomposites based on high-density polyethylene matrix (HDPE) and organically modified clay were prepared by melt processing and characterized by the determination of proton spin-lattice relaxation time through solid state nuclear magnetic resonance (NMR) spectroscopy. This work has a proposal to add one quantitative technique to help the researchers to better evaluate polymeric nanocomposite, because NMR is an important tool employed to study both molecular structure and dynamic molecular behavior. The nanocomposites were mixed in a twin-screw extruder, varying the shear rate parameter: 60 and 90 rpm at 463 K. Nanocomposites obtained were characterized through X-ray diffraction; thermal analysis; impact resistance and nuclear magnetic resonance. The T1H results showed that the samples present different molecular domains according to the clay dispersion, forming an intercalated and/or exfoliated nanocomposites. The measurement of relaxation time, using low field NMR, is a useful method to evaluate changes in the molecular mobility of nanocomposite and can infer whether the sample is exfoliated and/or intercalated, since lamellar filler is used.

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