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Phthalonitrile resins were an important kind of matrix with high thermal stability.Novel organic-inorganic hybrid composites were prepared by employing 4,4 0 -(1,3-phenylenebis[oxy]) diphthalonitrile (DPN) modified with polyborosilazane ceramic precursor (PBSN) in this work to explore the methods for synthesis of phthalonitrile resin with good processability as well as high heat-resistance. The maximal glass transition temperature (T g ) and 10% weight loss temperatures were about 615.0 and 608.1 C (N 2 ), respectively. The detailed thermal oxygen decomposition

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