Copertina di Ultrasound-Assisted Modification of Wood for Wood/Plastic Composites
Titolo del libro:

Ultrasound-Assisted Modification of Wood for Wood/Plastic Composites

The Effect of Pretreatment on Thermal, Mechanical Properties and Moisture Absorption Behavior

VDM Verlag Dr. Müller (19.02.2009 )

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ISBN-13:

978-3-639-11971-8

ISBN-10:
3639119711
EAN:
9783639119718
Lingua del libro:
Inglese
Risvolto di copertina:
The combined effects of alkali and ultrasound treatment of wood flour on the mechanical properties of polypropylene-based wood/plastic composites (WPCs) were examined. FTIR measurements confirmed that the alkali treatment removed both hemicellulose and lignin from the wood, and there was an increase in the number of hydroxyl groups on the cellulose surface. This process was promoted by the application of ultrasound. Mechanical testing of WPC samples revealed that alkali treatment improved both composite strength and modulus when polypropylene grafted with maleic acid was used as a coupling agent. The strength increase is due to improved adhesion between the fiber and matrix, while improved modulus is due to the removal of lignin and hemicellulose that are not as stiff as cellulose. Polarized optical microscopy showed the presence of well-defined polymer crystals on the surface of the modified wood, and this is also responsible for the improved mechanical properties. It is conclusively demonstrated that the combination of chemical treatment and ultrasound assistance is more effective in improving the mechanical properties of the composites.
Casa editrice:
VDM Verlag Dr. Müller
Sito Web:
http://www.vdm-verlag.de
Da (autore):
WEIPING CHANG
Numero di pagine:
84
Pubblicato il:
19.02.2009
Giacenza di magazzino:
Disponibile
categoria:
Tecnica
Prezzo:
49,00 €
Parole chiave:
Alkali treatment, coupling agents, mechanical properties, moisture absorption, surface modification, ultrasound, wood/plastic composites, WPC

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