Ester-Urethane Interchange Reaction

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概要

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• The ester-urethane interchange reaction has been studied by means of gas chromatography and NMR. The interchange reaction between low-molecular-weight ester and urethane was confirmed by the gas chromatography. Alternating copolyester-urethane was prepared by reacting bis-(hydroxyethyl)terephthalate with hexamethylene diisocyanate in anisole. When the polymer is melted at 190°C in the presence of sulfuric acid as a catalyst, the ester-urethane interchange reaction in alternating copolyester-urethane proceeds and causes a more random arrangement of the segments. This was proved by high-resolution nuclear magnetic resonance spectroscopy. An ethylene glycol residue adjacent to terephthalate on both sides, to diisocyanate on both sides, and to terephthalate and diiosyanate could be identified at 4.93, 4.48, and 4.71 ppm respectively in trifluoroacetic acid.

• 公益社団法人 日本化学会の論文

著者

• Suzuki Hajime

  Katata Research Institute, Toyobo Co., Ltd.

関連論文

• Ester-Urethane Interchange Reaction
• Studies of the Structure of Polyurethane Elastomers. II. The Determination of the Blockiness of Poly(Ether)Urethane Elastomes

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