Preparation of multifunctional supported metallocene catalyst using organic multifunctional modifier for synthesizing polyethylene/clay nanocomposites viaaain situ intercalative polymerization

A new type of multifunctional ammonium modifier with carbonyl group and vinyl group was synthesized to prepare multifunctional montmorillonites (F-MMTs), which were used as multifunctional catalyst supports for in situ ethylene polymerization. High loading of metallocene catalyst in the galleries of...

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Bibliographic Details
Published in:Polymer (Guilford) 2010-07, Vol.51 (15), p.3416-3424
Main Authors: Ren, Changyi, Du, Xiaohua, Ma, Li, Wang, Yanhui, Zheng, Jun, Tang, Tao
Format: Article
Language:English
Subjects:
Carbonyl groups
Catalysts
Ethylene
Montmorillonite
Nanocomposites
Polyethylenes
Polymerization
Resultants
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Summary:A new type of multifunctional ammonium modifier with carbonyl group and vinyl group was synthesized to prepare multifunctional montmorillonites (F-MMTs), which were used as multifunctional catalyst supports for in situ ethylene polymerization. High loading of metallocene catalyst in the galleries of F-MMT had been achieved due to the presence of carbonyl group in the multifunctional modifier. XRD profiles and TEM images showed that polyethylene/montmorillonite (PE/F-MMT) nanocomposites with exfoliated structure could be synthesized using the intercalated catalyst described above, even when the content of MMT was very high (more than 15.1aawt%). The as-produced PE/F-MMTs nanocomposites were composed of flower-like particles with a diameter of about 5aaI14m. A thermal stable monoclinic phase was observed in PE/F-MMT nanocomposites. Comparatively, the resultant PE/F-MMT nanocomposites showed low gas permeability. Interfacial interaction between PE matrix and F-MMT was enhanced due to the chemical linking between the two components via copolymerization of ethylene with vinyl group of F-MMT. Thus the resultant PE/F-MMT nanocomposites showed good structural stability. Display Omitted
ISSN:0032-3861
DOI:10.1016/j.polymer.2010.05.041