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Thermoplastic nanocomposites filled with wheat straw cellulose whiskers. Part II: Effect of processing and modeling
Author(s) -
Dufresne Alain,
Cavaillé JeanYves,
Helbert William
Publication year - 1997
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10274
Subject(s) - materials science , composite material , whiskers , whisker , composite number , thermoplastic , cellulose , scanning electron microscope , nanocomposite , chemical engineering , engineering
Abstract The reinforcing effect of cellulose microcrystals, or whiskers, dispersed in a thermoplastic matrix is analyzed. In Part I [ Polym. Compos. , 17, 604 (1996)], the preparation and the characterization of cellulose whiskers obtained from wheat straw were detailed. Composite films were processed by freeze‐drying and molding a mixture of aqueous suspension of these microcrystals and a film forming latex of poly(Styrene‐co‐ButylAcrylate). Using the same filler and latex, materials were processed by casting and evaporating the mixture of aqueous suspensions. It was found that the reinforcing effect is greater in the latter case. This behavior is ascribed to the sedimentation of the filler during evaporation, evidenced by scanning electron microscopy, wide angle X‐ray scattering, and dynamic mechanical analysis, and to the formation of a network of whiskers governed by a percolation mechanism. The behavior of the composite is modeled by subdividing the sample into layers with different whisker contents lying parallel to the film surface.