The Study Of Sulfonated Styrene/Ethylene Block Copolymer On The Surface Morphology And Colloid Assemble

Thermoplastic elastomers based on styrenic three block copolymers exhibit the melt processing characteristics of thermoplastics and many of the physical properties of vulcanized rubber. It is important to investigate the morphology of the block copolymers under congeries for us to understand the relationship between the structure and properties of this kind of thermoplastic elastomers. The morphology of thermoplastic elastomers based on styrenic block copolymers was investigated by atomic force microscope in this paper. The surface behavior of poly (styrene-butadiene-styrene) (SBS) and their derivatives poly (styrene-b-ethylene/butylenes-b-styrene) (SEBS) as primary resin was characterized by AFM and TEM. The adscription of phase was confirmed. In moderate TM-AFM, The bright areas in the phase and height images are assigned to discrete hard PS phases distributed in the dark, continuous PE and hydrogenation PEB phase. The results show that the copolymer molecular weight and styrene content have prodigious influence on congeries structure. It is easy to form ordered cylinder morphology with small size range when the styrene content is higher. Otherwise, the surface phase morphology is different with different cast film solvent. It is instructive significance for us to investigate the properties of thermoplastic elastomers based on styrenic three block copolymers.ABC block copolymer with special structure poly (styrene-b-ethylene/butylenes-b-ethylene) (SEBE) contains styrene side group, which can be sulfonated conveniently but have no influence brought by unsaturated double band. It made styrene group in molecular chain have ion group-sulfonic, to form ionization polymer. We investigated the congeries morphology of sulfonated poly (styrene-b-ethylene/butylenes-b-ethylene) (sSEBE) and its polymer colloid morphology that in solution, it is theory significance for us to understand the form mechanism of polymer colloid. The further sulfonation was applied by the new made acetyl sulfate as the sulfonating agent. We obtained sulfonated products with different degree of sulfonation-sSEBE. The copolymer was charactered by DSC, GPC, SEM, GPC and XRD. We investigated the influence of many factors on the surface morphology of block polymer, such as cast film tempreture, kinds of solvent, the solution concentration, the degree of solfonation, temperature treatment, the pH of solution and the time that the film dipped in the different pH solution. 12 H⁺ % sSEBE can form steady polymer colloid solution in THF/H₂O mixed solution.We cast this colloid solution on quartz slice to form film and we observed polymer colloid film on surface by AFM. The upper solution can form ion polymer after neutralized by sodium hydroxide. It can form polymer colloid film if the film was prepared by the same method. As a result of the sulfonation, the surface morphology of sS-EB-E changed with the different of sulfonated degree when the cast film solvent was toluene. The surface morphology of sulfonated ionomer (sis-EB-E) was characterized by AFM. Global aggregates could be observed on the surface when the degree of sulfonation is 3．4%H⁺ but the square and cylinder morphology with the 12%H⁺sSEBE. These results showed the solvent influence on polymer film surface.Layer-by-layer self-assembly approach by the electrostatic adsorption always is research hotspot for us to process moulding ordered functional molecule film. It is an important method to prepare nanometer functional film with hybrid nanometer particle. The novel functional nanometer material made by self-assembly approach has good future in macromolecule field. SSEBE can form steady polymer colloid in THF/H₂O mixed solution and on template. Polymer colloid was treated as a poly-anion, and using abio-colloid as the anti-ion, abio / organic colloid multilayer can be layer-by-layered fabricated by the electrostatic adsorption self-assembly approach. This paper used TiO₂ colloid and sS-EB-E polymer colloid as self-assembly material. We have prepared succefully TiO₂ / sS-EB-E multilayer film. UV adsorption at 228nm with the bilayer numbers indicated an equal thickness for each bilayer. The results showed the layered composite structure was formed on the substrate surface. The TiO₂/ sS-EB-E multilayer film was calcinationed at 700℃. The calcinated multilayer film was cross-sected with the substrate for SEM characterization. The film was composed layer-by-layer by TiO₂ nanosheets with a mean thickness of 160nm. The XRD results of the film before and after calcinations were not notable changes, anatase is the main phase for TiO₂ in such layered structure, which made the layered film fluorescence when excited by UV-light at proper wavelength. Fluorescence spectra of the multilayer film after calcinations show that the calcinated film has intensive fluorescence. Using TiO₂ colloid solution and sS-EB-E colloid solution, we prepare succefully complicated colloid particular in solution when the two colloid solutions were mixed with different proportion. The diameter of the complicated colloid was between the diameter of TiO₂ colloid and sS-EB-E colloid.