• Title/Summary/Keyword: Chemical Modification

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Synthesis of Various Functional Block Copolymers via Controlled Ring Opening Metathesis Polymerization and the Subsequent Chemical Modifications

  • Kang, Min-Hyuk;Moon, Bong-Jin
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.200-200
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    • 2006

  • Several polynorbornene or poly(norbornene-7-oxide) based functional block copolymers were synthesized by ring opening metathesis polymerization (ROMP) with good molecular weight and polydispersity control. Some representative functional groups in these polymers are a nitrobenzoyl group or ferrocene. These polymers were subjected to various chemical modification reactions to give other block copolymers that contain novel functionality such as amine, diazonium salt, and diazo groups. The resulting polymers were characterized by various techniques such as GPC, NMR, UV-VIS, AFM, and cyclovotammography (CV).

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Modification of Nafion Membranes for Reduction of Methanol Transport Rate

  • Kang, Dong-Hoon;Kim, Duk-Joon
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.127-128
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    • 2006

  • Nafion/basic polymer composite membranes were prepared to reduce the methanol crossover for the application of direct methanol fuel cell. The thermal and mechanical properties increased with increasing basic polymer contents due to the formation of complex via acid/basic interaction. The water uptake, proton conductivity, methanol permeability decreased with increasing basic polymer concentration by reduction of acidity associated with the formation of acid/base complex. The molecular effect on those properties was not considerable.

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