Structure And Rheology Properties Of Montmorillonite(MMT)/Wood Composite

In order to clarify structure of montmorillonite(MMT)/wood composite (WMC) and the interaction between wood and MMT at a molecular level, in this research, wood samples were firstly pretreated by different ways to increase penetrability, and afterwards WMC was compounded by medium of phenol formaldehyde resin (PF), then microstructure and some physical properties, such as crystallinity, stress relaxation, dielectric relaxation, viscoelastic properties, thermal stability and so on, were analyzed and some parameters, such as crystal parameters of WMC, thermodynamic quantities of static stress relaxation and thermodynamic relaxation processes, dielectric parameters of dielectric relaxation, were calculated. Using these parameters, the crystal structure and of composite was reasearched, and mechanism of bonding between wood and MMT at moluculer was developed.These main research results achieved are as follows,(1) The X-ray diffraction intensity of wood, which were treated respectively by sodium hydroxide(NaOH),microwave(MW), sodium hydroxide / microwave (NaOH /MW) and sodium hydroxide / ultrasonic (NaOH/US), decreased and some linkages were broke in crystal regions and the crystal density in wood crystal regions decreased accordingly. However, it was opposite for ultrasonic treated wood.(2) The organic modification of MMT had a great effect on the preparation of WMC. After organic modification, the interval between MMT layers expanded evidently, and the longer the length of organic compound molecular chains, the lager the interval of layers. At the same time, the organic compounds with side chains had also an evident effect on the expanding of interval. According to the analysis on the crystalinity of composite and control wood, it was concluded that MMT was divided in MMT/wood with US pretreatment composite, and MMT exist within the composite with other pretreatments in the form of insert. The crystal structures of all composites prepared by using different organic MMT hardly changed, but the relative crystallinities decreased.(3) Relative stress relaxation of wood which was treated by US and MW is smaller than that of...