Study On The Composite Modifications Of Fumaropimaric Acid Based Watcrborne Polvurethane

In this paper, Fumaropimaric acid based waterborne polyurethane (FWPU) was modifiedby acrylates and cellulose nanocrystals. Modified FWPU with improved comprehensiveproperties was prepared through a combination of the advantages of WPU, Fumaropimaric acid,acrylates and cellulose nanocrystals composite materials. It was showed that thesolvent-resistance, gloss and strength of composite could be increased by addition of acrylates.What is more, the tensile strength and heat resistance were increased by addition of cellulose.The butyl acrylate modified FWPU emulsion was synthesized from Fumaropimaric acidbased waterborne polyurethane and butyl acrylate. Effects of initiator type and content,temperature, time and the amount of butyl acrylate on properties of emulsions were studied.The products were characterized by FI-IR spectra. FWPUA with excellent comprehensiveproperties was obtained on the conditions of using azo-bis-isobutyronitrile and ammoniumpersulfate as composite initiator,0.8wt%content of initiator, temperature at80℃andreaction time for5h. The properties of the emulsion such as tensile strength, pendulumhardness, specular gloss, solvent-resistance of FWPUA were improved.FWPUA were prepared from methylaerylate (MMA) and butyl acrylate (BA) modifiedFWPU. Effects of temperature, initiator type and content, reaction time, the amount and ratioof butyl acrylate on properties of emulsions were studied. The products were characterized byFI-IR spectra. It was showed that the reaction time of MMA/BA copolymerization (4h) is lessthan that of BA (5h). The FWPUA emulsion with better properties was obtained on thecondition of mass ratio of MMA to BA2:1and acrylate30%. The pendulum hardness,specular gloss, tensile strength and solvent-resistance of films were improved with increase ofacrylate content.A series of FWPU/CNs nanocomposites were prepared by FWPU and cellulosenanocrystals (CNs). The structures and properties of these nanocomposites were studiedthrough XRD, SEM, DSC, TGA and FT-IR etc. The ordered structures are enhanced due to the hydrogen bonding. It can be concluded from XRD that the diffraction peaks in thenanocomposite materials are attributable to the CNs component. Meanwhile, thediffractograms of nanocomposites are only superimpositions of the diffractograms of the twocomponents. And the amorphous nature of WPU and the crystal structure of FCNs areunchanged. The properties of nanocomposites such as tensile strength, lastic modulus and heatresistance are improved by adding cellulose.