Presentation on theme: "Metal-free ring-opening block copolymerization of epoxide initiated with organic ammonium acetate salt Lisa Nakajima, Yuiko Kikuchi, Hisatoyo Morinaga."— Presentation transcript:
Metal-free ring-opening block copolymerization of epoxide initiated with organic ammonium acetate salt Lisa Nakajima, Yuiko Kikuchi, Hisatoyo Morinaga * Department of Materials and Science Kochi National College of Technology
Metal-free polymerization Conventional polymerization using metallic initiators and catalysts Metal-free polymerization Polymers with residue of toxic metals Polymers without possible contamination of toxic metals Limitation for usage Biomedical engineering Environmental engineering
Controlled polymerization Non-controlled polymerization Controlled polymerization 1. Polymer chain length can be controlled. 2. Propagating species is stable. ⊖ ⊖ ⊖ ⊖ ⊖ ⊖ 1. Polymer chain length cannot be controlled. 2. Propagating species is unstable.
Metal-free controlled polymerization of glycidyl phenyl ether (GPE) 1) Morinaga, H. et al, Macromolecules, 2007, 40, 6014-6016. 2) Morinaga, H. et al., Journal of Network polymer, Japan, 2010, 31(6),272-277. 3) Morinaga, H. et al., Journal of Polymer Science, Part A : Polymer Chemistry, 2011, 49(24), 5210-5216.
Sequential block copolymerization by controlled polymerization 1 st monomer Controlled polymerization block copolymerization poly(1 st monomer) having stable propagating species AB diblock copolymer ⊖ 2 nd monomer