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Chain packing in polycarbonate glasses.

Dirk Stueber1, Tsyr-Yan Yu, Berk Hess

  • 1Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA.

The Journal of Chemical Physics
|March 18, 2010
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Summary
This summary is machine-generated.

Chain packing in polycarbonate blends was studied using nuclear magnetic resonance. Different fluorine labels revealed distinct nearest-neighbor distances, indicating specific chain arrangements in these homogeneous blends.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Solid-State Nuclear Magnetic Resonance

Background:

  • Understanding polymer chain packing is crucial for predicting material properties.
  • Bisphenol A polycarbonate (BPA-PC) is a widely used engineering thermoplastic.
  • Homogeneous blends of modified BPA-PC offer a platform to study molecular interactions.

Purpose of the Study:

  • To characterize chain packing in homogeneous blends of bisphenol A polycarbonate.
  • To quantify interchain distances between different labeled sites using nuclear magnetic resonance.
  • To compare chain packing arrangements influenced by different fluorine labeling strategies.

Main Methods:

  • Utilized (13)C{(19)F} rotational-echo double-resonance (REDOR) nuclear magnetic resonance spectroscopy.
  • Employed a shifted-pulse REDOR sequence to map initial dipolar evolution and determine nearest-neighbor separations.
  • Applied a constant-time REDOR version to measure next-nearest and more distant neighbor separations.

Main Results:

  • Determined average distances between (13)C=O and (19)F labels in homogeneous BPA-PC blends.
  • Found that the average distance from a ring-fluorine to the nearest (13)C=O is >1.2 Å greater than the CF(3)-(13)C=O distance.
  • Observed statistically significant local order for nearest-neighbor labels in the methyl-labeled blend.

Conclusions:

  • The study provides quantitative insights into interchain packing in polycarbonate blends.
  • Results suggest distinct local ordering based on the position of fluorine labels.
  • Findings are in qualitative agreement with coarse-grained simulations of BPA-PC, validating the model.