Physicomechanical and thermal properties of moldings made from liquefied wood-based novolak PF resins under various hot-pressing conditions

Autor:	Yi-Chun Chen, Chiou-Chang Wu, Wen-Jau Lee, Yu-Mei Juan
Rok vydání:	2009
Předmět:	Materials science Polymers and Plastics Formaldehyde Wood flour General Chemistry Hot pressing Surfaces Coatings and Films Molding (decorative) chemistry.chemical_compound chemistry Materials Chemistry Zinc stearate Hexamethylenetetramine Composite material Thermal analysis Curing (chemistry)
Zdroj:	Journal of Applied Polymer Science. 113:1257-1263
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.30066
Popis:	The wood powder of Cryptomeria japonica (Japanese cedar) was liquefied in phenol, with H2SO4 and HCl as a catalyst. The liquefied wood was used to prepare the liquefied wood-based novolak phenol formaldehyde (PF) resins by reacting with formalin. Furthermore, novolak PF resins were mixed with wood flour, hexamethylenetetramine, zinc stearate as filler, curing agent, and lubricating agent, respectively, and hot-pressed under 180 or 200°C for 5 or 10 min to manufacture moldings. The results showed that physicomechanical properties of moldings were influenced by the hot-pressing condition. The molding made with hot-pressing temperature of 200°C for 10 min had a higher curing degree, dimensional stability, and internal bonding strength. The thermal analysis indicated that using a hot-pressing temperature of 180°C was not sufficient for the liquefied wood-based novolak PF resins to completely cure. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Databáze:	OpenAIRE
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