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Reinforcing effect of carboxymethylated nanofibrillated cellulose powder on hydroxypropyl cellulose

Eyholzer, Ch ; Lopez-Suevos, F. ; Tingaut, P. ; Zimmermann, T. ; Oksman, K.

In: Cellulose, 2010, vol. 17, no. 4, p. 793-802

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    Titel
    • Reinforcing effect of carboxymethylated nanofibrillated cellulose powder on hydroxypropyl cellulose
    Autor
    • Eyholzer, Ch. Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland
    • Lopez-Suevos, F.. Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland
    • Tingaut, P.. Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland
    • Zimmermann, T.. Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland
    • Oksman, K.. Division of Manufacturing and Design of Wood and Bionanocomposites, Luleå University of Technology (LTU), Luleå, Sweden
    Dokumententyp
    • Postprint
    OAI-PMH-ID
    • oai:doc.rero.ch:313143
    Summary
    Bionanocomposites of hydroxypropyl cellulose (HPC) and nanofibrillated cellulose (NFC) were prepared by solution casting. The various NFC were in form of powders and were prepared from refined, bleached beech pulp (RBP) by mechanical disintegration, optionally combined with a pre- or post mechanical carboxymethylation. Dynamic mechanical analysis (DMA) and tensile tests were performed to compare the reinforcing effects of the NFC powders to those of their never-dried analogues. For unmodified NFC powders an inferior reinforcing potential in HPC was observed that was ascribed to severe hornification and reagglomeration of NFC. In contrast, the composites with carboxymethylated NFC showed similar behaviors, regardless of the NFC suspensions being dried or not prior to composite preparation. SEM characterization confirmed a homogeneous dispersion of dried, carboxymethylated NFC within the HPC matrix. These results clearly demonstrate that drying of carboxymethylated NFC to a powder does not decrease its reinforcing potential in (bio)nanocomposites