The Synthesis And Photochromism Study Of Polymer Containing Azobenzene Side Chain Starch

This thesis consists of the following four parts:Part I : The optical activity of polymer containing azobenzene side chainand their optical applicationRecent progress in photochromism of polymer containing azobenzene side chain was reviewed in this paper. This review concentrates on the types of polymer system and their photoisomerization, and its potential application as optical data storage. Investigations of photochromism, nonlinear optical properties and optical anisotropic are associated with probable applications for optical data storage, nonlinear optical materials, liquid crystal polymer, photoelectric devices, photoregulation of bioactivity of biomolecule and nanometer technology. However, the difficulties that stand in the way to practical applications are also listed. With the development of research in polymer containing azobenzene side chain, these difficulties will be overcome.Part II: The synthesis and structural characterization of containing azobenzene starchThe graft copolymerization of vinyl monomers and soluble starch were carried out using K2S2O8-NaHSO3:Ce(NH4)2(SO4)2 (l:l)as initiation system, sodium dodecyl benzene sulfate as emulsifier. The effects of concentration of initiators, vinyl monomer concentration, reaction temperature, reaction period have been investigated. When the concentration of initiator was 1.25 10-3mol/L, the monomer concentration was 5g/L, the reaction temperature and period choosed as 70 C and 2.5h, respectively. The G% and GE% were 130.8% and 72% respectively. Which is best during the process in the range studied. The evidence and characterization of graft copolymers has been researched by means of FTIR spectroscopy, X-ray diffraction analysis, scanning electron microscopy (SEM),thermograrimetry analysis (TGA) and differential thermal analysis (DTA).Part III: The photoisomerization behavior of copolymers soluble starch and vinyl monomer in solutionsThe photoisomerization of 27 copolymers of vinyl monomer and soluble starch were investigated in solutions. The effects of spatial hindrance , solvent, free volume were investigated. The result showed that the structure of graft copolymers exhibit a marked influence on photoisomerization. The smaller of the spatial hindrance is, the easier the photoisomerization will be, and copolymers manifest better photoisomerization than their corresponding monomers, In addition, para-acrolyloxy substitution exhibits good photoisomerization, while ortho-acroloyloxy substitution appears to take place photochromic hindrance.Part IV: The study of the extraction and separating from red radish of Lanzhou and character of red radish pigment of LanzhouA method of extracting red pigment from Lanzhou's radish was studied in this thesis, as well as on the effect of light, heat, pH several kinds of food additives and heavy metal ions on the stability of red radish pigment. In addition, in order to separating and analyzing red radish pigments, thin-layer chromatography and column are used to study how much factors as the quantity of pigment, developing agent, developing time etc. influence the pigments separating, these research provided academic basis for the use and exploitation of red radish pigment.