Influence of the silane grafting of polyethylene on the morphology, barrier, thermal, and rheological properties of high-density polyethylene/organoclay nanocomposites

In this work, silane‐grafted high‐density polyethylene was prepared by reactive extrusion. This product and neat high‐density polyethylene were then melt‐compounded with organically modified montmorillonite to form nanocomposites. A series of tests, including Fourier transform infrared spectroscopy,...

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Bibliographic Details
Published in:Journal of applied polymer science 2012-07, Vol.125 (S1), p.E305-E313
Main Authors: Sharif-Pakdaman, Ali, Morshedian, Jalil, Jahani, Yousef
Format: Article
Language:English
Subjects:
barrier
compatibilization
Crosslinking
Crystallization
Degree of crystallinity
Density
Differential scanning calorimetry
Extrusion
Fourier series
Fourier transforms
Grafting
Materials science
Melt temperature
Montmorillonite
Morphology
Nanocomposites
Oxygen transfer
Polyethylene
polyethylene (PE)
Polyethylenes
Polymers
Rheological properties
Rheology
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Summary:In this work, silane‐grafted high‐density polyethylene was prepared by reactive extrusion. This product and neat high‐density polyethylene were then melt‐compounded with organically modified montmorillonite to form nanocomposites. A series of tests, including Fourier transform infrared spectroscopy, small‐angle X‐ray diffraction, and transmission electron microscopy, were done on the specimens to investigate the grafting efficiency and its compatibilizing effect and the microstructure of the samples. In addition, the thermal, rheological, and barrier properties were examined to study of the grafting effects and nanocomposite characteristics. The results indicate that an intercalated structure could be easily obtained in the nanocomposites with a grafted matrix. A significant reduction in the degree of crystallinity and an increased crystallization temperature with grafting and the incorporation of nanoclay were proven by thermal analysis (differential scanning calorimetry), whereas the melting temperature did not change noticeably. Dynamic rheological testing indicated the disappearance of the Newtonian plateau and solidlike behavior of the nanocomposites based on grafted polyethylene in lower frequencies. Furthermore, the oxygen transfer rate of the samples decreased significantly with the incorporation of nanoclay in the grafted matrix and the moisture crosslinking of the samples. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
ISSN:0021-8995
1097-4628
DOI:10.1002/app.36367