Segmented Poly(urethane-urea)s Synthesized Directly from Isocyanate-Terminated Prepolymers and Masked Diamines III. Kinetic and Mechanistic Study on Polymerization Reactions

DOI 参考文献6件

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タイトル別名
  • Segmented Poly(urethan-urea)s Synthesized Directly from Isocyanate-Terminated Prepolymers and Masked Diamines III. Kinetic and Mechanistic Study on Polymerization Reactions.

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説明

The direct synthesis of segmented poly(urethane-urea)s (DSPUU) from an isocyanate-terminated prepolymer (ITPP) and reaction products (AE) from acetone and ethylenediamine consisting of N-isopropylideneethylenediamine (1), N,N′-diisopropylideneethylenediamine (2), 2,2-dimethylimidazolidine (3), water and the unreacted diamine was kinetically investigated. The following elementary reactions forming the desired urea structure linkage take place simultaneously in the absence of an acid at 40°C; (i) reaction of NCO groups with amino groups of the unreacted diamine and (1), (ii) direct reaction of NCO groups with (3), (iii) ring opening reaction of (3), and (iv) reaction of NCO groups with the ketimine groups in (1) and (2). The side reactions of NCO groups with water (Urea II formation reaction) catalyzed by both the ketimine groups and the imino groups occurred. Dramatic decrease of the yield of Urea II in the presence of acetic acid is attributed to the acid-catalyzed ring opening of the imino groups of (3) in particular and acid-catalyzed hydrolysis of the ketimine groups.

収録刊行物

  • Polymer Journal

    Polymer Journal 29 (10), 826-835, 1997

    The Society of Polymer Science, Japan

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詳細情報 詳細情報について

  • CRID
    1390282681266428672
  • NII論文ID
    130004429808
  • DOI
    10.1295/polymj.29.826
  • COI
    1:CAS:528:DyaK2sXmvFGrsrY%3D
  • ISSN
    13490540
    00323896
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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