| 简 介： |
In order to prepare a wood-based composite material which, as a type of
multifunctional and natural bio-based material, possesses satisfactory mechanical
properties, excellent durability (i.e., decay resistance and dimensional stability), and
environmental characteristic, the study presents a new method which is based on the
cellular structure of wood by initiating polymerizable monomers for in situ
polymerization. Glycidyl methacrylate (GMA) as a multifunctional and polymerizable
monomer was chosen, and impregnated into the porous structure of wood. After a
thermal-catalyst process, the wood-based composite, PGMA/Wood, was prepared.
The structure of this material was analyzed by SEM, FTIR and XRD; and its
performance was also determined. The analyzing results show that GMA not only
polymerized in the cellular structure in a solid form and amorphous form, which fully
and uniformly filled in wood cell lumen, but also sufficiently grafted onto wood cell
walls in a chemical level, resulting in tight contact between wood cell walls and
resultant polymers (PGMA) without any obvious cracks. The test results of
mechanical properties show that the modulus of rupture (MOR), modulus of elasticity
(MOE), compression strength, and hardness of PGMA/Wood increased by 82%,
122%, 139%, and 348% over those of untreated wood, respectively. The test results of
durability show that the dimensional stability and decay resistance of PGMA/Wood
improved 44% and 91% than those of untreated wood, respectively. Such composite
could be widely applied in the fields of construction, furniture and traffic. |
