Study On The Specific Interaction And Phase Morphology Control Of PS-co-MMA/Phenolic Resin Blend System

For the Polymer blend system of Poly (styrene-co-Methyl methacrylate) (PS-co-MMA)/phenolic resin (PR), there exists specific interaction of hydrogen bond between the polymer components. Therefore, it is possible to control the phase morphology by changing the composition of the copolymer and the blending ratio of the PS-co-MMA/ PR blend system. In this thesis, the phase morphology of the blend was studied by Atomic force microscopy (AFM), Scanning electron microscopy (SEM). The blend system morphology evolution was studied by using a small angle light scattering (SALS) method;the crystallization behavior of the PESu/PR system was studied by DSC method. The main results obtained are as follows:1 .A series of PS-co-MMA were synthesized by emulsion polymerization. The copolymers produced were characterized by using FTIR, ¹H NMR and ¹³C NMR, the predicted composition was achieved. 2.The miscibility of polymer blends depended on â–³_x between two polymer components and solvent, the miscibility of cast films could be predicted by the â–³_x values between the two polymer components with cosolvent. 3, By AFM and SEM observations, some droplets in the casting films ofPS-co-MMA/ PR blends. From which it could be concluded that the nano-structured morphology could be achieved via adjusting the strength of hydrogen bonds between the polymer components.4. The influence of temperature on tha phase separation approach to the spinodal decomposition line was studied for the PS-co-MMA/ PR system. The result indicated that there is a induced period of phase separation existed, the time of which depends on the strength of hydrogen bonds. The processing of phase separation can be described by Cahn-Hilliard theory.5. The crystallization and melting behaviors of poly(ethylene succinate)(PESu)/PR blends were studied. The DSC results demonstrated that the PR played the heterogeneous nucleation role in the crystallizing of PESu, meanwhile the hydroxy group of PR can cause interfere to the molecular motion of PESu chains and thus reduce it's crystallizability. The isothermal crystallization parameters were deduced from Avriami equation. In addition, the activation energy of crystallization for PESu/phenolic blends was calculated by the Arrhenius relationship.