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Hexagonal Phase Formation and Crystalline Structural Transition in Long-Spaced Aliphatic Polyesters with Side Groups.

Chenxuan Sun1, Xuekuan Ma1, Lingling Ni1

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Side groups on linear polyesters influence their crystal structure and phase transitions. Understanding these effects is key for designing advanced polyester materials with tailored properties.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Crystallography

Background:

  • Side substitution is a key strategy for modifying linear polyesters.
  • Side groups significantly impact the crystalline structure and phase transitions of semicrystalline polyesters.

Purpose of the Study:

  • To investigate the influence of -OH and -CH3 side groups on the crystal polymorphism and phase transition behavior of long-spaced polyesters.
  • To explore the relationship between side group structure, methylene segment length, and polyester crystallization.

Main Methods:

  • Synthesis of long-spaced polyesters with varying side groups (-OH, -CH3) and methylene segment lengths.
  • Crystallization studies at different temperatures to observe polymorphic behavior.
  • Analysis of phase transitions using annealing and heating experiments.

Main Results:

  • Polyesters crystallized in a thermally stable phase (form I) at higher temperatures.
  • At lower temperatures, a metastable hexagonal phase (form II) with trans chain conformation was observed.
  • Phase transition from form II to form I occurred upon annealing or heating, involving chain tilting and lamellar thickening.

Conclusions:

  • Side groups critically influence the polymorphic crystallization of linear polyesters.
  • The study elucidates the mechanism of phase transition in substituted polyesters.
  • Findings provide insights for controlling polyester crystal structures and properties through side-chain engineering.