Solution Behavior of PNIPAm-PEO-PPOPNIPAm Pentablock Terpolymer

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Solution Behavior of PNIPAm-PEO-PPOPNIPAm Pentablock Terpolymer Global COE Seminar No.143 “Science for Future Molecular Systems” Kyushu University International Research Center for Molecular Systems Speaker : Associate Prof．Binyang Du （MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China） Solution Behavior of PNIPAm-PEO-PPOPNIPAm 　　　　　　　　　Pentablock Terpolymer The double thermo-sensitive and narrow dispersed PNIPAm-PEO-PPO-PEO-PNIPAm pentablock terpolymers were synthesized by the typical atomic transfer radical polymerization (ATRP) method with N-isopropylacrylamide (NIPAm) as the monomer and modified F127 [poly(ethylene oxide)100-poly(propylene oxide)65-poly(ethylene oxide)100 (PEO100-PPO65-PEO100)] or P123 (PEO19-PPO69-PEO19) block copolymer as the macroinitiator. Micro-differential scanning calorimetry (Micro-DSC) data showed that the pentablock terpolymer exhibited two low critical solution temperatures (LCSTs) in the aqueous solution, which were can be attributed to the thermal phase transition of the PPO block and PNIPAm block, respectively. The values of LCSTs were dependent on the block lengths of PNIPAm, PEO, and PPO. The chain conformation of the pentablock terpolymer in aqueous solution was studied in details by using a combination of static and dynamic laser light scattering (SLS & DLS). The SLS & DLS results indicated that the loose “associates” and single coil chains coexisted in the aqueous solution at the low temperature, where the PEO, PPO, and PNIPAm blocks were soluble in water. At the high temperature above the LCSTs of PPO and PNIPAm blocks, the pentablock terplymer chains formed large and stable core-shell micelles with collapsed PPO and PNIPAm cores and swollen PEO shells. The sizes of “associates” and micelles were related with the block lengths of the pentablock terpolymers. 2011.5.28 (Sat) 11:00a.m～12:30p.m ※ Admission Free Ito : West4-315 主催：繊維学会西部支部共催：九大高分子機能創造リサーチコアグローバルCOE未来分子システム科学 Contact Information:Global COE Office (Ito W2-616) Tel: 092-802-2900, E-mail: gcoe_office@mail.cstm.kyushu-u.ac.jp