Stay On The Fabrication And Performance Of Lignocelluloses/inorganic(Carbon) Nanomaterials Binderless Firdberboa

With the improvement of living standards,people pay more and more attention to the release of free formaldehyde in the board,and the requirements for the board are getting higher and higher.The preparation of the binderless fiberboard by the binderless technology can effectively avoid the release of free formaldehyde in the board,and the composite binderless fiberboard with multi-functionality can be prepared by adding nanoparticles and surface modification technique to meet people's various needs in life.Using lignocelluloses as raw material,the binderless fiberboard with layered structure and its functionality were prepared by nanoparticle composite and surface modification technique,endowing binderless fiberboard conductive and electromagnetic shielding;flame retardant and superhydrophobic performances.Improve the comprehensive utilization rate of wood,develop functional composite binderless fiberboard,and open up a new way and ideas for the efficient use of wood resources,in order to provide reference for the application of multi-functional binderless fiberboard.The morphology and structure of the composite were characterized by the scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR).The main conclusions are as follows:(1)A binderless fiberboard with a layered structure was prepared by grinding and hot pressing using lignocelluloses as raw material.During the hot pressing process,lignocellulose degraded a large amount of furfural,and the furfural content of the binderless fiberboard was 89.54 ?g/100g,which was significantly higher than that of lignocellulose 2.64 ?g/100g.furfurals and Hydrogen bonds are connected with lignocelluloses.The crystallinity of the binderless fiberboard was 47.9%,which was higher than 33.4%of lignocellulose.And layered structure is discovered in binderless fiberboard.Therefore,layered lignocelluloses material showed high strength mechanical properties which modulus of elasticity(MOE),modulus of rupture(MOR)and internal bonding strength(IB)reach to 2 669±218 MPa,15.6±2.7 MP and 0.60±0.11 MPa?(2)Lignocelluloses/carbon nanotube composite binderless fiberboard was prepared by grinding and hot pressing using lignocellulose as raw material and carbon nanotube as filler.Lignocelluloses are laminated by the grinding and the composite material appeared layered structure by hot pressing.The carbon nanotubes are successfully attached to the surface of lignocellulose and are connected by ester bonds and hydrogen bonds.The results of mechanical property tests show that the modulus of elasticity(MOE),modulus of rupture(MOR)and internal bonding strength(IB)of the composite material increased by about 20%,90%and 20%comparing with the binderless fiberboard.The results of electromagnetic absorption property show that the composite material has the lowest reflection loss peak at-7.3 dB in the range of 3.5-5.0 mm in thickness and 9.8-16.7 GHz in frequency.The results of the electrical conductivity test reveals that the carbon nanotubes impart good conductivity to the composite material and the conductivity is 0.715 S/m.(3)Lignocelluloses and AlOOH nanoparticles(NPs)are integrated to be layered AlOOH nanoparticles/lignocelluloses composite material(LALM)successfully using industrial wood fiber through the methods of grinding and hot pressing.And then,secondary soft lithography which the superhydrophobic structure on lotus leaf is grafted to LALM surface is used to fabricate modified LALM(MLALM).A layered structure is observed in MLALM,and AlOOH nanoparticles are successfully attached to the surface of lignocellulose and connected by ionic bonds and hydrogen bonds.Thus,the modulus of elasticity(MOE),modulus of rupture(MOR)and internal bonding strength(IB)of the composite material are increased by about 30%,90%and 25%comparing with the binderless fiberboard.AlOOH NPs improve the mechanical properties of MLALM and impart flame retardant performance to MLALM.The technology of secondary soft lithography gives MLALM superhydrophobic performance with the contact angle of 152°±1°.