Analysis of the Dynamic Crystallisation of Isotactic Polypropylene/α-Nucleating Agent Systems by DSC |
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Authors: | Marco C. Ellis G. Gómez M. A. Arribas J. M. |
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Affiliation: | (1) Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain;(2) Dirección Corporativa de Servicios Compartidos, Dirección de Tecnología de REPSOL-YPF, Embajadores 183, 28045 Madrid, Spain |
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Abstract: | The nucleation efficiency of dibenzylidene sorbitol, methyldibenzylidene sorbitol and 1,2,3,4-bis- (3,4-dimethylbenzylidene) sorbitol in the crystallisation of the monoclinic phase of isotactic polypropylene has been evaluated by differential scanning calorimetry as a function of cooling rate and nucleation agent concentration. In order to analyse the nucleation activity of the additives, the self-nucleation process of the pure polypropylene has also been studied by thermal techniques. A large increment in the crystallisation temperatures has been obtained even for the lowest additive concentration, and the nucleating efficiencies are of the highest observed for α-nucleating agents in isotactic polypropylene. This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | crystallisation DSC efficiency isotactic polypropylene nucleating agents sorbitol derivatives |
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