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Room temperature crystallization of amorphous polysiloxane using photodimerization.

Taylor Wright1, Yael Petel1, Carson O Zellman2

  • 1Department of Chemistry, University of British Columbia Vancouver BC Canada V6T 1Z1 mwolf@chem.ubc.ca.

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|June 14, 2021
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Summary

Researchers developed a novel photo cross-linking method to control crystallization in flexible polymers. This technique enables simultaneous cross-linking and crystallization, creating millimeter-sized, leaf-like structures from polysiloxane chains.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Crystallization Science

Background:

  • Controlling bulk crystallization in flexible polymers is challenging due to random chain orientation.
  • Conventional amorphous polymer systems often lack precise morphological control.

Purpose of the Study:

  • To develop a photo cross-linking strategy for simultaneous cross-linking and crystallization in polysiloxane chains.
  • To investigate the growth dynamics and morphology of photo-induced crystalline structures.

Main Methods:

  • Synthesis of polymers with pendant anthracene groups.
  • Photocycloaddition using 365 nm irradiation at room temperature.
  • Characterization using polarized optical microscopy (POM), atomic force microscopy (AFM), and pulsed-field gradient (PFG) NMR.

Main Results:

  • Achieved simultaneous cross-linking and crystallization of polysiloxane chains.
  • Formation of millimeter-sized, leaf-like polycrystalline structures.
  • Observed three distinct stages of crystal growth: nucleation, growth, and constriction.
  • Probed chain mobility using PFG-NMR to understand transport mechanisms.

Conclusions:

  • The photo cross-linking strategy offers a new method for morphological control in silicone materials.
  • Room temperature crystallization of amorphous polymers is achievable.
  • Understanding chain mobility is crucial for controlling crystal growth fronts.