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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallography

Background:

  • Random copolymers of poly(alkylene carbonate)s exhibit unique crystallization behaviors.
  • Understanding melt memory in copolymers is crucial for predicting material properties and processing.

Purpose of the Study:

  • To investigate the effect of dual isodimorphic and isomorphic crystallization modes on melt memory in poly(alkylene carbonate) random copolymers.
  • To elucidate the role of intermolecular interactions in determining melt memory.

Main Methods:

  • Self-nucleation experiments
  • Synchrotron X-ray scattering
  • Polarized light microscopy
  • Dielectric spectroscopy

Main Results:

  • Isodimorphic crystallization decreased melt memory with increasing comonomer content.
  • Isomorphic crystallization led to increased melt memory, with domain widths up to 30 °C.
  • Higher dielectric constants in the isomorphic phase indicated stronger intermolecular interactions.

Conclusions:

  • Intermolecular interactions within the crystal lattice are critical for enhanced melt memory in copolymers exhibiting dual crystallization modes.
  • Comonomer incorporation significantly tunes crystallization behavior and melt memory in poly(alkylene carbonate) random copolymers.