Abstract
Siloxane-imide block copolymers with different siloxane contents and lengths based on 3,3′,4,4′-benzophenonetetracarboxylic dianhydride, aromatic dianhydrides with four phenylene rings and bis(γ-aminopropyl)polydimethylsiloxane were prepared and their physical, thermal and mechanical properties were studied. The siloxane-imide block copolymer consists of a microphase separated structure of polyimide and polysiloxane phases and have two glass transition temperatures arising from polyimide and polysiloxane phases. The higher glass transition temperature (Tg2) of the copolymer was lowered with increasing the siloxane content, while the lower Tg1 was almost independent of the siloxane content and length. The thermal decomposition temperature, tensile modulus and tensile strength of the copolymer were also lowered with increasing the siloxane content. The moisture absorption of the copolymers was very low compared with aromatic polyimides, which was almost independent of the siloxane content. The thermal expansion coefficient of the copolymer was a little increased with increasing the siloxane content up to 30 wt%. Siloxane-imide block copolymers with desired properties can be controlled by the siloxane content and length.
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Yamada, Y., Furukawa, N. Preparation and Characterization of Siloxane-Imide Block Copolymers Based on 3,3′,4,4′-Benzophenonetetracarboxylic Dianhydride. Polym J 29, 923–930 (1997). https://doi.org/10.1295/polymj.29.923
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DOI: https://doi.org/10.1295/polymj.29.923
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