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Determination of the Avrami exponent of partially crystallized polymers by DSC- (DTA-) analyses

  • Polymer Science
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Abstract

This paper presents a new method for a rapid determination of the Avrami exponentn by nonisothermal thermoanalytic analysis (DSC and DTA, resp.). Contrary to conventional techniques this method can be used in the entire temperature range and therefore it is applicable to polymers crystallizing from the melt.

The proposed technique is applied to injection moulded low density polyethylene (LDPE), injection moulded high density polyethylene (HDPE), unpigmented extruded polypropylene (PPunpigm.) and pigmented extruded polypropylene (PPpigm.). The resulting values for the Avrami exponentsn LDPE∼2.9,n HDPE∼1.3,\(n_{PP_{unpigm} }\)∼2.2 and\(n_{PP_{pigm} }\)∼ 2.1 derived by crystallization from the melt were compared with isothermal measurements and with results given by other authors.

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Author notes

  1. K. Harnisch

    Present address: Institut für Experimentalphysik, Universität Innsbruck, Austria

  2. H. Muschik

    Present address: Laboratorium für Kunststofftechnik LKT-TGM, Wien

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    1. K. Harnisch
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    2. H. Muschik
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    Harnisch, K., Muschik, H. Determination of the Avrami exponent of partially crystallized polymers by DSC- (DTA-) analyses. Colloid & Polymer Sci 261, 908–913 (1983). https://doi.org/10.1007/BF01451668

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    • DOI: https://doi.org/10.1007/BF01451668

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