| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1988: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1987: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Research Abstract |
Anionic polymerizations of styrene and 1,3-butadiene derivatives containing functional groups were carried out under various conditions. In the anionic polymerization of styrene containing alkyl carboxylate function (I), stable living polymer was formed when it was polymerized in THF at -95 C with potassium as a counterion. In the case of lithium counterion, no polymerization took place. The quantitative hydrolysis of ester function in the resulting polymer was achieved by the treatment with trimethylsilyl iodide under neutral condition to give poly(4-vinylbezoic acid) having well-defined chain structure. With monomers bearing alkyl sulfonamide (II) and alkyl sulfonate (III) groups, polymers with narrow molecular weight distributions were obtained quantitatively regardless of the counterion used. In some cases, precipitation of polymers were observed during the course of polymerization. This was presumably due to the aggregation of active chainend species.
The anionic polymerizations of 1,3-butadiene containing formyl (IV) and hydroxy (V) groups protected with acetal functions resulted in the formation of polymers of controlled molecular weights with narrow molecular weight distributions when they were prepared in THF at -78 C with sodium and/or potassium counterion. The microstructure of the resulting polymers were mainly 1,2- and 3,4-, which was close to the structures of polyisoprene prepared in polar solvent.
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