PE/Clay Nanocomposite with Bimodal Molecular Weight Distribution Produced Via In-Situ Polymerization

A Ti-based Ziegler–Natta catalyst supported on the clay was used for producing the polyethylene/clay nanocomposites through in situ polymerization. This catalyst showed high activity in the ethylene polymerization. The two-step polymerization approach, i.e. in the presence and absence of hydrogen, w...

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Bibliographic Details
Published in:Journal of inorganic and organometallic polymers and materials 2014-03, Vol.24 (2), p.416-423
Main Authors: Abedi, Sadegh, Abdouss, Majid, Daftari-Besheli, Majid, Moghimi, Ali, Ghafelehbashi, Seyed Mehdi, Pourian, Mohammad Ali
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Clay (material)
Ethylene
Gravimetric analysis
Inorganic Chemistry
Molecular weight distribution
Nanostructure
Organic Chemistry
Polyethylenes
Polymer Sciences
Polymerization
Thermal properties
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Summary:A Ti-based Ziegler–Natta catalyst supported on the clay was used for producing the polyethylene/clay nanocomposites through in situ polymerization. This catalyst showed high activity in the ethylene polymerization. The two-step polymerization approach, i.e. in the presence and absence of hydrogen, was laid out to broaden the molecular weight distribution of the polyethylene/clay nanocomposite. The molecular weights and molecular weight distribution of the nanocomposites were characterized by the gel permeation chromatography. It was found that the molecular weight distribution was remarkably widened towards bimodal distribution by using the above mentioned approach. The thermal properties of the produced nanocomposites were studied by differential scanning calorimetry and thermal gravimetric analysis. The microstructure of the resulting bimodal polyethylene/clay nanocomposite was investigated by X-ray diffraction and transmission electron microscopy. The thermal gravimetric analysis indicated an improved thermal stability of the produced nanocomposites. In addition, the studies proved the nanocomposite formation with the exfoliated structure of the clay in the polyethylene matrix.
ISSN:1574-1443
1574-1451
DOI:10.1007/s10904-013-9982-y