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Dynamic Mechanical and Morphological Studies of Isotactic Polypropylene/fumed Silica Nanocomposites with Enhanced Gas Barrier Properties by V. Vladimirov; C. Betchev; A. Vassiliou; G. Papageorgiou; D. Bikiaris is a Engineering article available to read on EtoBox.

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Polypropylene/fumed silica nanocomposites were prepared via melt mixing using a twin-screw co-rotating extruder. To improve the dispersion degree of the nanoparticles, maleic anhydride grafted polypropylene (PP-g-MA) was used as a compatibilizer. From transmission electron microscopy it was found that agglomerations of silica particles into the PP matrix increased in average size with increasing silica contents whilst they decreased at higher PP-g-MA amounts. Storage modulus values of prepared nanocomposites measured by DMTA were sensitive to the microstructure of the nanocomposites. Higher silica contents resulted in higher storage modulus, evidence revealing that the material became stiffer. By adding the PP-g-MA copolymer a further increase of storage modulus was observed due to the finer dispersion of the filler in the matrix and the increased interfacial adhesion. Both permitted a much more efficient transfer of stresses from the polymer matrix to the SiO 2 nanoparticles. Crystallization rates were found to increase by increasing silica nanoparticles as well as PP-g-MA content. In fact for a given PP-g-MA content increasing the silica content up to 5-7.5 wt% accelerated the cr

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Author

V. Vladimirov; C. Betchev; A. Vassiliou; G. Papageorgiou; D. Bikiaris

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0266-3538)

Published

2006

Language

EN

Field

Engineering (Physical Sciences)