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|標題:||Preparation and characterization of PP/clay nanocomposites based on modified polypropylene and clay||作者:||Wu, J.Y.
|關鍵字:||adsorption;clay;crystallization;nanocomposites;polypropylene;mechanical-properties;organophilic clay;layered silicate;crystallization;intercalation;behavior;morphology;kinetics;hybrids||Project:||Journal of Polymer Science Part B-Polymer Physics||期刊/報告no：:||Journal of Polymer Science Part B-Polymer Physics, Volume 43, Issue 22, Page(s) 3242-3254.||摘要:||
X-ray diffraction and differential scanning calorimeter (DSC) methods have been used to investigate the crystallization behavior and crystalline structure of hexamethylenediamine (HMDA)-modified maleic-anhydride-grafted polypropylene/clay (PP-g-MA/clay) nanocomposites. These nanocomposites have been prepared by using HMDA to graft the PP-g-MA (designated as PP-g-HMA) and then mixing the PP-g-HMA polymer in hot xylene solution, with the organically modified montmorillonite. Both X-ray diffraction data and transmission electron microscopy images of PP-g-HMA/clay nanocomposites indicate that most of the swellable silicate layers are exfoliated and randomly dispersed into PP-g-HMA matrix. DSC isothermal results revealed that introducing 5 wt % of clay into the PP-g-HMA structure causes strongly heterogeneous nucleation, which induced a change of the crystal growth process from a three-dimensional crystal growth to a two-dimensional spherulitic growth. Mechanical properties of PP-g-HMA/clay nanocomposites performed by dynamic mechanical analysis show significant improvements in the storage modulus when compared to neat PP-g-HMA. (c) 2005 Wiley Periodicals, Inc.
|Appears in Collections:||化學工程學系所|
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