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The isothermal crystallization kinetics and morphology developments of iPP/POSS nanocomposites presented an unusual crystallization behaviors.The exothermic morphologies of isothermal crystallization of iPP/POSS composites changed remarkable with increasing POSS.Moreover, the morphology development of spherulitic for iPP/POSS composites showed the POSS molecules became nanocrystals firstly and then aggregated together forming thread-or network-like morphologies at very small loading of POSS.