Reference : Polyethylene-layered silicate nanocomposites prepared by the polymerization-filling t...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/4507
Polyethylene-layered silicate nanocomposites prepared by the polymerization-filling technique: synthesis and mechanical properties
English
Alexandre, Michaël mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Dubois, Philippe [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Sun, Tao [The Dow Chemical Company, Midland, USA > > > >]
Garces, Juan M. [The Dow Chemical Company, Midland, USA > > > >]
Jérôme, Robert mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Apr-2002
Polymer
Elsevier Sci Ltd
43
8
2123-2132
Yes (verified by ORBi)
International
0032-3861
Oxford
[en] nanostructured material ; nanocomposite ; clay
[en] Polyethylene-layered silicate nanocomposites were prepared by the in situ intercalative polymerization of ethylene by the so-called polymerization-filling technique and analyzed by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), differential scanning calorimetry, dynamic mechanical analysis and tensile testing. Non-modified montmorillonite and hectorite were first treated by trimethylaluminum-depleted methylaluminoxane before being contacted by a Ti-based constrained geometry catalyst. The nanocomposite was formed by addition and polymerization of ethylene. In the absence of a chain transfer agent, ultra high molecular weight polyethylene was produced. The tensile properties of these nanocomposites were poor and essentially independent of the nature and content of the silicate. Upon hydrogen addition, the molecular weight of the polyethylene was decreased with parallel improvement of the tensile and shear moduli, in relation to the filler content. The exfoliation of the layered silicates was confirmed by XRD analysis and TEM observation. The mechanical kneading of the molten nanocomposites resulted in the partial collapse of the exfoliated structure driven by the thermodynamic stability of the layered filler.
Center for Education and Research on Macromolecules (CERM)
Dow Chemical ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; The US Department of Commerce, National Institute of Standards and Technology, Advanced Technology Program, Cooperative Agreement Number 70NANB7H3028
Researchers
http://hdl.handle.net/2268/4507
10.1016/S0032-3861(02)00036-8
http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TXW-44XTMY7-3-2H&_cdi=5601&_user=532038&_orig=browse&_coverDate=04%2F30%2F2002&_sk=999569991&view=c&wchp=dGLzVlz-zSkWA&md5=2e5dc7160fc29eec613cc51d61941563&ie=/sdarticle.pdf
http://www.elsevier.com/wps/find/journaldescription.cws_home/30466/description#description
The authors acknowledge Polymer (Elsevier) for allowing them to archive this paper.

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