The Synthesis、Characterization And Application Of Cellulose Derivatives/europium Nanocomposite

Hydroxypropyl carboxymethyl cellulose(HPCMC) and carboxymethyl cellulose(CMC) are cellulose ethers derivatives whicn containing carboxyl, they have characteristics of both high polymer stability and environment friendly. Rare earth metal are precious strategic resources with a wide range of application. In this thesis we adopt HPCMC, CMC as polymer ligands which can coordinate with Eu3+ to obtain nanocomposites not only possessing good luminescence properties but also meeting the demand of the development of modern green chemistry. HPCMC/Eu and CMC/Eu were successfully synthesized by controlling the experimental conditions. The molecular structure, morphology and crystalline structure were analyzed by FT-IR, XPS, WAXD, SEM, EDS and TEM; UV-vis and PL were applied to investigate the fluorescence property. The HPCMC/Eu and CMC/Eu nanoparticles were also been applied to the offset printing ink and paper, using the rheological, color, and tolerance test to analyze the change of the ink performance, while also characterized and explored the papers’ physical properties and optical properties. Main conclusions of this paper were summarized as follow:(1) Eu3+ coordinated with the Oxygen coming from the carboxyl, hydroxyl and ether in the ligand HPCMC and the coordination way was bridge type. The HPCMC/Eu was in the range of nano-meter, enable them to launch the strong characteristics fluorescence peak of the Eu3+. pHs affected the conformation of HPCMC or CMC macromolecular chain, Eu3+ concentration changes will affect the intensity of fluorescence. Adding the HPCMC/Eu nanoparticles into the ink can result in the functionality of fluorescence of the ink. A new simple and cheap kind of ink additives with potential can be used to make luminous ink and there is no need to change the original equipment and process. This ink system has excellent rheological property and a certain ink uv light resistance, heat resistance and alcohol resistance.(2) Within the scope of this experiment, in CMC/Eu system the best synthesis temperature was 70 ℃, the best ratio between CMC ligand and Eu3+ was m(Eu3+) : m(CMC) = 0.07:1, reaction time was 35 min. Under the condition of the CMC/Eu nanoparticles has uniform distribution and particle size, also the best fluorescent performance. Reaction temperature could change the molecular symmetry of nanocomposites, the increase of temperature would make a the lack of symmetry around Eu3+, thus affecting the luminous intensity; Eu3+ concentration changes will affect the intensity of fluorescence, the low concentration of Eu3+ means-OH becoming larger fluorescence quenching agent efficiently while the large Eu3+ concentration resulted in bigger lattice defects of Eu3+, which all make fluorescence intensity reduce. The optimum adding amount of CMC/Eu nanoparticles in the coniferous wood was 6%, in the broadleaf wood was 5%, under this condition can have best combination of with paper. In this experiment, the CMC/Eu nanocomposite is suitable for application in functional specialty paper with luminescence performance.