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 The Effect of Pretreatment on Thermal, Mechanical Properties and Moisture Absorption Behavior Ultrasound-Assisted Modification of Wood for Wood/Plastic Composites.
Наименование:

The Effect of Pretreatment on Thermal, Mechanical Properties and Moisture Absorption Behavior Ultrasound-Assisted Modification of Wood for Wood/Plastic Composites.

автор WEIPING C. издательство Книга по Требованию Прочие виды транспорта
Cтраниц 84        мягкая обложка       
Аннотация:The combined effects of alkali and ultrasound treatment of wood flour on the mechanical properties of polypropylene-based wood/plastic composites (WPCs) were examined. It is conclusively demonstrated that the combination of chemical treatment and ultrasound assistance is more effective in improving the mechanical properties of the composites. 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. 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. 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. 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.
Автор: WEIPING C.
Издательство: Книга по Требованию
Год:2009
Цена:
2007 руб
Нет в наличии
Поиск: The Effect of Pretreatment on Thermal, Mechanical Properties and Moisture Absorption Behavior Ultrasound-Assisted Modification of Wood for Wood/Plastic Composites.
НОВЫЙ ГОД СИМВОЛ 2013 ГОДАУКРАШЕНИЯ
КАРНАВАЛ НА НОВЫЙ ГОД РАСПРОДАЖА
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