Synthesis And Characterization Of Reversible Thermochromatic Material Of Polydiacetylene And Polystyrene Composite Particles

Functional polymer materials are an important of polymer materials.It mainlystudies molecule design and synthesis of different functional polymermaterials,relationships between structure and property and application of newmaterials.A functional polymer material is made up of structural polymer materialsand complex polymer materials.In this thesis,works focus on the synthesis of intelligent materials andnanocomposite materials.（1） Preparation of organic reversible thermochromatic material and study on itsproperty.This paper concerns a conjugated polymer based on diacetylene which carries aglutamic acid,serine or aspartic acid head.the carboxyl and amide which inducesintermolecular H-bonding during self-assembly.In present system,the novel polymerdisplays a reversible color change from blue-to-red as the temperature is variedbetween25℃-70℃in solution,and repeated heating-cooling cycles can lead to theswitches between red and blue colors.Furthermore,reversible thermochromic behaviorwas demonstrated in the polyvinyl pyrrolidone solution embedded PDA molecules. the solution initially undergoes a transformation from blue to purple color after aheating-cooling cycle. Further reversible color changes between red and purple can beobserved when was heated to70℃and cooled to25℃.However,thermochromic assaysshowed PCDA-glutamic acid is irreversible in the aqueous solution of gelatin and thesodium alginate.the consequence showed that the effect of the property of polymersolution on the thermochromic behavior of the PCDA-glutamic acid.（2）Core/shell structure composite particles.In the paper,the hollow polymer particles with amide, ester, and carboxyl groupson the polymer shell-layers containing the quaternary ammonium salt polyelectrolyte（PS） cores by a facile route with a four-stage reaction and subsequent removal of thesandwiched silica-layer from the corre-sponding PE/SiO₂/polymer hybridmicrospheres in hydrofluoric acid.The tetra-layer hybrids were synthesized by thequaternary ammonium salt polyelectrolyte （PS） for the core and the emulsionpolymerization for the formation of polymer shell-layer, and the controlled hydrolysis of TEOS in ethanol/water mixed solvent via a modified St ber process.The efficientelectrostatic interaction between the cationic charges on the surface of PE cores andthe negative siliceous species was essential to afford monodisperse PE/SiO₂composites during the controlled hydrolysis of TEOS. The polymer shell-layer withvarious functional groups were successfully encapsulated onto the MPS-modifiedPE/SiO₂seeds, during which the capture ability of the incorporated vinyl groups forthe newly formed radical species and comonomers played a key role for theconstruction of the final monodisperse PE/SiO₂/polymer hybrid microspheres with atetra-layer structure.The morphology and structure of the tetra-layer hybridmicrospheres and the corresponding hollow microspheres with PS core and functionalpolymer shell-layer were characterized by TEM and IR.The composite materials of the hollow polymer particles with polyelectrolyte （PS）cores and various functional groups on the shell-layers use to absorb Pb²⁺of theindustrial wastewater.their the maximum adsorption capacity were40mg g^-1,41mgg^-1,80mg g^-1,respectively.