CHARACTERISTICS OF CARBOXYMETH YL CNC SELF-ASSEMBLY WITH CATION IC FLUORESCENT DYE
CNC(cellulose nano-crystal)has been widely used in the field of papermaking,construction,automotive,food,cosmetics and medicine due to its superior properties,such as high crystallinity,high purity,high Youngs modulus,high strength,hyperfine structure and high transparency.However,CNC also has many defects.For example,CNC particles aggregate easily through hydrogen bonding and lack some physical and chemical properties possessed by most macro-molecular compound.These defects have limited its application and development.In this study,anionic groups were rendered to CNC by grafting with sodium chloroacetate.The results showed that the anionically modified CNC was well dispersed and was being stable in aqueous media due to enhanced surface charge density.Furthermore,that basic structural units spontaneously aggregate into a stable regular geometric appearance based on the interaction of non-covalent bonds during the self-assembly,the cationic fluorescent molecule(cationic fluorescent yellow 40)was combined to the surface of carboxymethyl cellulose nano-crystal(CMCNC)with electrovalent bond so as to manufacture a new type of CNC-based fluorescent ink.Results showed that the optimal etherification time of CMCNC is 60 min,and etherification temperature is 60℃.The DS of CMCNC by conductometric titration is 0.1,and the particle diameter has good dispersion stability and particle size stability can last for several days.The maximum mass ratio of CMCNC and cationic fluorescent yellow 40 is 1:6.49×10-4.The value-added fluorescence intensity and UV absorbance of the self-assembled dye reach the maximum under the maximum mass ratio.With the substitution of hydroxyl groups by Carboxyl groups on the surface of CNC,CMCNC exhibited improved dispersion property,and exhibited a decrease in surface polarity after the modification with sodium chloroacetate.The aging time of the UV fluorescent ink reached up to 160 hours in the experiment.
Zhiheng Yang Wei Wu Jie Zhao Li Xu Zehua Liu
Tianjin Key Laboratory of Pulp and Paper,Tianjin University of science & Technology Tianjin,300457,China
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-6
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）