側鎖結晶性ブロック共重合体を用いた粒子分散系の熱レオロジー特性(2)

概要

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In a previous paper, we reported that a block co-polymer constructed with side chain crystalline monomer and monomer having solvent affinity (Side Chain Crystalline Block Co-Polymer : SCCBC) decreased the viscosity of polyethylene particle dispersion incredibly. The dispersion system also showed the Thermal Rheological (TR) phenomenon that was with increasing the temperature the viscosity increased to the almost original viscosity of the dispersion system without SCCBC and with decreasing temperature the viscosity decreased reversibly. In this study, we considered the effect of the sequence distribution of SCCBC, species of side chain crystalline monomer, and species of solvent. We found that with using random copolymer, the TR behavior decreased. By changing the length of the side chain we could change the dispersant effect and also could control the transition temperature of TR phenomenon. We also found a specific SCCBC structure which could apply to the Teflon particle dispersion system. Moreover, we found that the dispersant effect depended on the species of the solvent and the dependence could arrange by the interfacial tension between solvent and solvent affinity monomer.
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