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首页> 外文期刊>Journal of Applied Polymer Science >Thermally stable, flame retardant, low-dielectric constants, and flexible thermosetting resins based on a tetra-functional benzoxazine compound possessing a cyclic siloxane core
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Thermally stable, flame retardant, low-dielectric constants, and flexible thermosetting resins based on a tetra-functional benzoxazine compound possessing a cyclic siloxane core

机译：Thermally stable, flame retardant, low-dielectric constants, and flexible thermosetting resins based on a tetra-functional benzoxazine compound possessing a cyclic siloxane core

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Cyclosiloxanes possessing organic functional moieties are reactive organic-inorganic hybrids as effective building blocks for preparation of organic-inorganic nanocomposites. In this work, a tetra-functional benzoxazine compound (cD(4)-4Bz) with a cyclosiloxane core has been synthesized, cD(4)-4Bz could be considered as a self-crosslinkable benzoxazine compound and has been utilize in preparation of the corresponding polybenzoxazine-cyclosiloxane thermosetting resins. The obtained crosslinked polybenzoxazines exhibit good film formability and attractive thermal properties including a thermal stability above 390 degrees C, a glass transition temperature above 400 degrees C, and a char yield of 64.5 wt at 800 degrees C, and low dielectric constant of 2.74 and a dissipation factor of 0.18 at 10 GHz. The hig char yield also indicates its high flame retardancy with a calculated limited oxygen index of 44. Moreover, cD(4)-4Bz is a suitable agent for polymer modification through cocuring reactions with a tetrafunctional cyclosiloxane-phenol compound, a main-chain benzoxazine, and a bifunctional benzoxazine compound. One prepared sample has exhibited a high thermal stability above 435 degrees C and a char yield of 72.9 wt. The high flexibility and variety in the fabrication of high-performance thermosetting resin have been demonstrated.

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