摘要
制备了CMC/Eu(Ⅲ)、CMC/Tb(Ⅲ)、HPCMC/Eu(Ⅲ)、HPCMC/Tb(Ⅲ)纳米复合物,通过XPS、UV-Vis、流变学检测及TG-DSC研究了产物的"天线效应"、荧光性质、静态/动态流变性质以及热性质.XPS结果表明,Eu^(3+)、Tb^(3+)与CMC、HPCMC均生成Ln(Ⅲ)—O,而且产物的紫外吸收与其激发光谱有重叠,证明纤维素衍生物所吸收的能量可以成功地转移到稀土金属,使之发光;流变学性能研究结果表明,前述4种纳米复合物溶液均为假塑性流体,黏流活化能分别为1.5964、2.5193、1.6047和1.4218 k J/mol,其黏度对温度具有依赖性;溶液的储能模量和损耗模量均随角频率的增大而增大;纳米复合物与CMC-Na、HPCMC-Na有相似的热性质,且HPCMC侧链更易与水通过氢键结合.
CMC/Eu( Ⅲ),CMC/Tb( Ⅲ),HPCMC/Eu( Ⅲ),HPCMC/Tb( Ⅲ) nanocomplexes were prepared,and the "antenna effect",fluorescence properties,static and dynamic rheological properties and thermal properties of the products were investigated by means of XPS,UV-Vis,rheological detection and TG-DSC. XPS results show that Ln( Ⅲ) —O is formed in all the products of Eu^(3+)and Tb^(3+)reacting with CMC and HPCMC,and the UV absorption of the products overlaps its excitation spectrum,which proves that the energy absorbed by cellulose derivatives can be successfully transferred to a rare earth metal to make it light. The results of the rheological properties of the nanocomplexes show that the solutions of all nanocomplexes are pseudo-complex,and the flow activation energy of the four kinds of nanocomplexes are 1. 596 4,2. 519 3,1. 604 7 and 1. 421 8 k J/mol respectively,suggesting that the viscosity is dependent on temperature. In addition,the storage modulus and loss modulus of the solution grow up with an increase of the angular frequency; the thermal properties of the nanocomplexes are similar to those of CMC-Na and HPCMC-Na,and the side chains on HPCMC are more readily associated with water through hydrogen bonding.
作者
叶君
刘惠铭
熊犍
YE Jun1 ,LIU Hui-ming1, XIONG Jian2(1.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guanghzou 510640,Guangdong,China; 2.School of Food Science and Engineering,South China University of Technology,Guanghzou 510640,Guangdong,Chin)
出处
《华南理工大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2017年第11期48-56,共9页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(31270617)
制浆造纸工程国家重点实验室资助项目(2016C12)~~
关键词
稀土发光材料
纳米复合物
天线效应
流变
荧光
rare earth luminescent materials
nanocomplexes
antenna effect
rheology
fluorescence