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Area of Science:

  • Polymer Science
  • Materials Chemistry

Background:

  • Polybut-1-ene (PB-1) is a polymer with unique crystallization and phase transition behaviors.
  • Nucleating agents (NA) are additives used to control polymer crystallization kinetics and morphology.
  • Sorbitol-based nucleating agents are commonly used in polyolefins like polypropylene.

Purpose of the Study:

  • To investigate the effect of a specific sorbitol-based nucleating agent (NA) on the crystallization and phase transition of polybut-1-ene (PB-1) homopolymer and random copolymer.
  • To understand how NA influences the transition from the tetragonal form II to the trigonal form I in PB-1.
  • To evaluate the impact of NA solubility on PB-1 crystallization behavior.

Main Methods:

  • Studying the crystallization and phase transition of PB-1 homopolymer and copolymer with and without NA.
  • Observing the transformation from tetragonal form II to trigonal form I over time at room temperature.
  • Analyzing changes in crystallization temperature, peak width, melting behavior, and haze.

Main Results:

  • NA significantly accelerates the phase transition in PB-1, especially in the homopolymer.
  • In copolymers, NA increases crystallization temperature, narrows crystallization and melting peaks, indicating a more uniform structure.
  • The addition of NA leads to increased haze, confirming the formation of a two-form structure.
  • NA exhibits solubility in PB-1 melt at high temperatures, influencing crystallization.

Conclusions:

  • Commercial sorbitol-based NA has a substantial impact on the crystallization and phase transition of both PB-1 homopolymer and copolymer.
  • NA modifies PB-1 structure, leading to improved uniformity and altered phase transition kinetics.
  • Understanding NA solubility is crucial for predicting its effect on PB-1 crystallization.