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Enhancing the formation of the new trigonal polymorph in isotactic propene-1-pentene copolymers: Determination of the X-ray crystallinity

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Abstract

A metallocene copolymer of isotactic propene and 1-pentene was subjected to different crystallization conditions with 13 mol% of 1-pentene counits, aiming to enhance the formation of a new trigonal modification of iPP. Since it was not possible to obtain a diffractogram for the amorphous sample of cPPe13 at room temperature, the X-ray crystallinity was determined using the profile of the molten polymer, extrapolated to room temperature according to the resulting temperature coefficients. The X-ray diffraction results indicate a very interesting polymorphism in this copolymer; when crystallized from solution, amazingly high degrees of crystallinity — as high as 65% — are obtained, and this value is similar to those obtained for the iPP homopolymer. Further, the enthalpy of melting for a 100% crystalline sample of the trigonal modification was estimated from those crystallinities and the actual enthalpies of melting.

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Authors and Affiliations

  1. Instituto de Ciencia y Tecnología de Polímeros ICTP-CSIC, Juan de la Cierva 3, 28006, Madrid, Spain

    Ernesto Pérez, María L. Cerrada, Rosario Benavente & José M. Gómez-Elvira

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  1. Ernesto Pérez
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  2. María L. Cerrada
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  3. Rosario Benavente
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  4. José M. Gómez-Elvira
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Correspondence to Ernesto Pérez.

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Pérez, E., Cerrada, M.L., Benavente, R. et al. Enhancing the formation of the new trigonal polymorph in isotactic propene-1-pentene copolymers: Determination of the X-ray crystallinity. Macromol. Res. 19, 1179–1185 (2011). https://doi.org/10.1007/s13233-011-1103-6

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  • DOI: https://doi.org/10.1007/s13233-011-1103-6

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