关键词: 纤维素衍生物荧光膜, 制备, 非牛顿流体, 膜结构, 荧光性能, 力学性质

Abstract: The carboxymethyl cellulose (CMC) composite fluorescent films with CMC/Tb-Eu (CTE) were pre- pared by casting method，and the rheological properties of CTE suspensions were studied． The structure and pro- perties of composite films were characterized by Fourier transform infrared spectroscopy (FTIR)，atomic force microscopy (AFM)，fluorescence spectroscopy (FL) and mechanical tests． The rheological results show that the CTE suspensions with mass fraction from 2% to 6% maintain the rheological characteristics of shear thinning of CMC solution． FTIR shows that process during the film formation does not change the chemical structure of CTE particles． That is，Tb³⁺  or Eu³⁺ undergoes coordination and ion exchange reaction with CMC． When the excitation wavelength is 374nm，the composite films emit a characteristic fluorescence spectrum of Tb³⁺ and Eu³⁺ ，wherein the emission peak fluorescence intensity at 543nm is the largest，which is ⁵ D₄ →⁷F₅  emission of Tb³⁺ ． When the CTE content is 0. 2g，the fluorescence intensity of the film is the strongest． The mechanical properties show that the increase of CTE content can simultaneously increase the tensile modulus and tensile strength of the film，and there is no significant difference in the elongation at break． The maximum tensile modulus of the film is 4. 179GPa and the maximum tensile strength is 78. 76MPa．

Key words: fluorescent film of cellulose derivative, preparation, non Newtonian flow, structure of film, fluores- cence, mechanical property