Mechanism of a Chain-Extending Reaction in the Synthesis of Segmented Poly(urethane-urea) Using Blocked Ethylenediamine.
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- Nakano Yasuhiro
- Central Laboratory, Asahi Chemical Industry Co., Ltd.
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- Yamazaki Emiko
- Central Laboratory, Asahi Chemical Industry Co., Ltd.
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- Hanahata Hiroyuki
- Central Laboratory, Asahi Chemical Industry Co., Ltd.
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- Okajima Kunihiko
- Central Laboratory, Asahi Chemical Industry Co., Ltd.
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- Kitahama Yoshiharu
- Japan Elastomer Co., Ltd.
書誌事項
- タイトル別名
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- Mechanism of a Chain-Extending Reaction
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An attempt was made to clarify the mechanism of a chain-extending reaction of NCO-terminated prepolymers in the synthesis of segmented poly(urethane–urea) using blocked ethylenediamine (EDA) with acetone (ACE). For this purpose, an ACE/EDA mixture was allowed to react with phenyl isocyanate (PhNCO) as a model of the prepolymer. The reaction of PhNCO with the ACE/EDA mixture, which was proved to contain ketimine and imidazolidine compounds by NMR measurements, gave 1,1′-ethylenebis[3-phenylurea] (M-Ur-1) as the main product; at the same time 1,3-diphenylurea (1,3-DPU) was assumed to be formed as a side-reaction product between PhNCO and H2O, inevitably existing in the mixture as the result of condensation. From a considerable increase in the yield of M-Ur-1 upon the addition of an excess amount of H2O to the reaction system, H2O was elucidated to participate in the acceleration of the main reaction, giving M-Ur-1 as well as in the side reaction, yielding 1,3-DPU. The excess H2O added to the system might preferentially facilitate the former reaction, rather than the latter.
収録刊行物
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- Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan 70 (5), 1185-1192, 1997
公益社団法人 日本化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679099218304
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- NII論文ID
- 130004058109
- 10008919114
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- NII書誌ID
- AA00580132
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- ISSN
- 13480634
- 00092673
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- NDL書誌ID
- 4219913
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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