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In situ SAXS investigations of isothermal crystallization in poly(TMPS) fractions

  • Polymer Science
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Abstract

The isothermal crystallization kinetics of poly(TMPS) has been measured by ISSAXS and results obtained for a molecular weight fraction (21,000) below the critical entanglement molecular weight (25,000) and another one above it (371,000). The SAXS intensity vs. time curves suggest that a single transformation mechanism exists. The SAXS long period is independent of crystallization time for both poly(TMPS) fractions. However the interlamellar thickness contribution to the long period is dependent upon molecular weight and crystallization temperature, increasing with temperature and molecular weight. The crystallite contribution also increases over the range studied. Both fractions exhibit a significant, but reversible decrease in thickness on cooling the sample from the crystallization temperature to room temperature and recyling again. The change is more pronounced for 371,000 specimen in keeping with its lower crystallinity. The path dependence of lamellar dimensions has significant implications in the morphological characterization of polymers annealed or crystallized at one temperature and then measured at another one.

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Author notes

  1. J. H. Magill

    Present address: Department of Materials, Science and Engineering, University of Pittsburgh, Pittsburgh, USA

Authors and Affiliations

  1. Department of Chemical Engineering, University of Delaware, Newark, USA

    J. M. Schultz

  2. Center for Small-Angle Scattering, Oak Ridge National Laboratory, Oak Ridge, USA

    J. S. Lin

Authors
  1. J. H. Magill
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  2. J. M. Schultz
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  3. J. S. Lin
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Magill, J.H., Schultz, J.M. & Lin, J.S. In situ SAXS investigations of isothermal crystallization in poly(TMPS) fractions. Colloid & Polymer Sci 265, 193–205 (1987). https://doi.org/10.1007/BF01412707

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  • DOI: https://doi.org/10.1007/BF01412707

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