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Study on Bonding Performance and Construct of Nanomaerial of Bamboo and Wood Treated by Cold Plasma

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Tutor: DuGuanBen
School: Nanjing Forestry University
Course: Wood Science and Technology
Keywords: Pinus yunnanensis,Dendrocalamus sinicus,cold plasma,wettability,magnetic
CLC: TS653
Type: PhD thesis
Year:  2013
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Abstract:
In this study, the Pinus yunnanensis; Dendrocalamus sinicus, the two representative speciesin Yunnan province, were treated by N2, O2, Ar radio frequency discharge and airdielectric barrier discharge cold plasma. This paper studied the optimum process ofevery kind of cold plasma and then the surface aging behavior and activation time ofthe optimum process were also studied; the surface morphology changes andchemical composition changes of the wood and bamboo were analyzed using SEM,XPS and FTIR. The bonding perfomance of the wood and banboo that treated by coldplasma was studied and the magntic performance of wood treated by DBD coldplasma was also studied.The results shown in this study can be summarized as follows:£¨1£© The improvement of the wettability of material surface treated by cold plasmais closely related to the process parameters. In this study, the optimumprocesses of every kind of cold plasma to improve the wettability of wood andbamboo are: N2-RF cold plasma,200W,2min for Pinus yunnanensi;300W,1min for Dendrocalamus sinicus; O2-RF cold plasma,300W,3min forPinus yunnanensi;200W,2min for Dendrocalamus sinicus; Ar-RF cold plasma,300W,3min for Pinus yunnanensi;300W,2min for Dendrocalamus sinicus; airDBD cold plasma,4KW,7times for Pinus yunnanensi;4KW,3times forDendrocalamus sinicus under the speed of12m/min..£¨2£© The contact angles of the Pinus yunnanens and Dendrocalamus sinicus decrease;the surface wettability of the materials have been improved when treated bycold plasma. But the effect of surface modification that treated by the coldplasma decrease gradually with the time going on, and it is related to the kindof the cold plasma and the material. In this study the aging behavior trends areconsistent that the modification effect almost disappears about2weeks. Inorder to ensure the modification effect of the cold plasma, the subsequentprocessing should be carried out immediatedly.£¨3£© The result of the SEM observation shows that the surface of the Pinusyunnanensis and Dendrocalamus sinicus become rough which have obvioustraces of plasma etching after cold plasma treatment. The plasma etching of thematerials treated by N2, O2cold plasma are more obvious than the others. Theresult of the XPS shows that the surface of the treated materials have N element, the atomic ratio O/C has increased which increasing most treated by O2coldplasma, the content of C1decreases while the content of C2and C3increasingwhich meant more groups are oxidized or more peroxides are formed on thesurface. The result of the FTIR shows that content of O-H and C-O increase ofthe material surface that treated by cold plasma.£¨4£© The bonding performance of the wood and bamboo can been improved by coldplasma treatment. In this study the bonding strength of the Pinus yunnanensincreases largely treated by N2-RF cold plasma, reaching to75.83%. For thesame adhesive, the ratio of bonding strength increasing for the four kinds ofcold plasma in this study is N2>O2>DBD>Ar, but for the same cold plasma, theincreasing for the different adhesives is UF>MUF>MF. The bondingperformance of the wood and bamboo can been improved after cold plasmatreatment is due to the the surface contact angle decreasing, the free energyincreasing, the wettability improving which is good for the formation of the¡°adhensive nail¡± and the diffusion and adsorption of adhensive on the materialsurface.£¨5£© The magnetic Fe3O4/Pinus yunnanensis composite was prepared successfullyusing the DBD cold plasma which is a method of simple process, low cost, nopollution. The amount of the nano-Fe3O4is related to the times of immersion.In this study, the optimum process is the5times for20minutes each time, andthe Fe3O4/Pinus yunnanensis composite have good electromagnetic shielding.
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