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Effect of cooling rate on melt-crystallization of random propylene-ethylene and propylene-1-butene copolymers

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Summary

The effect of variation of the rate of cooling on melt-crystallization of random copolymers of isotactic polypropylene with low amount of either ethylene or 1-butene is evaluated using X-ray techniques, atomic force microscopy, and calorimetry. Slow non-isothermal melt-crystallization mainly results in formation of monoclinic α-crystals of lamellar geometry. The presence of comonomers leads to a decrease of the degree of crystallinity, and of the thickness of lamellae. These changes are proportional to the concentration of co-units, and are more distinct in propylene-ethylene copolymers. Rapid cooling of propylene-1-butene copolymers leads to formation of non-lamellar mesomorphic domains, independent of the concentration of co-units within the investigated range of concentrations. In quenched propylene-ethylene copolymers, in contrast, the formation of mesomorphic structure partially is replaced by formation of monoclinic α-crystals of still non-lamellar geometry.

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Authors and Affiliations

  1. Center of Engineering Sciences, Martin-Luther-University Halle-Wittenberg, 06099, Halle/S., Germany

    Daniela Mileva, René Androsch & Hans-Joachim Radusch

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  1. Daniela Mileva
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  2. René Androsch
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  3. Hans-Joachim Radusch
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Correspondence to René Androsch.

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Mileva, D., Androsch, R. & Radusch, HJ. Effect of cooling rate on melt-crystallization of random propylene-ethylene and propylene-1-butene copolymers . Polym. Bull. 61, 643–654 (2008). https://doi.org/10.1007/s00289-008-0979-6

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  • DOI: https://doi.org/10.1007/s00289-008-0979-6

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