Internal stress of cured epoxide resins modified with silicone elastomers.

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  • シリコーンエラストマーで変性したエポキシ樹脂硬化物の内部応力
  • シリコーン エラストマー デ ヘンセイシタ エポキシ ジュシ コウカブツ ノ

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Abstract

Bisphenol-A type epoxide resin was modified with two kinds of silicone elastomers, i. e., amino-terminated polysiloxane (ATPS) and polydimethylsilanol (PDMS). Both systems modified with the silicone elastomers had two phase structures in which the silicone phase is dispersed in the cured epoxide resin matrix. A swelling test for uncured resins showed that the silicone phase in the ATPS-modified system has no crosslinks and the phase in the PDMS-modified system forms a crosslinked structure. Internal stresses of the unmodified and ATPS-modified systems were linearly increased with a decrease of the ambient temperature in cooling process. The internal stress of the PDMS-modified system was linearly increased in the beginning of cooling process, but decreased abruptly when the temperature reached near 70°C. Thus, the internal stress at room temperature of this system was considerably lower than that of other systems. In addition, the expansion of cured resin was abnormally observed at about 70°C in the cooling process of the PDMS-modified system. The decrease of internal stress in this system is attributed to the expansion phenomenon observed during the cooling process

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 47 (3), 185-191, 1990

    The Society of Polymer Science, Japan

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