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Observing Depolymerization of a RAFT Polymer by Time-Resolved Small-Angle X ray Scattering.

Rintaro Takahashi1, Ayae Sugawara-Narutaki2,3

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This study reveals that poly(benzyl methacrylate) depolymerization via unzipping results in decreasing molecular weight while maintaining polymer size. This provides new insights into polymer degradation mechanisms.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Chemical Kinetics

Background:

  • Polymethacrylates synthesized via reversible addition-fragmentation chain-transfer (RAFT) polymerization can depolymerize upon heating.
  • Limited understanding exists regarding the mechanisms and kinetics of this depolymerization process.

Purpose of the Study:

  • To investigate the depolymerization mechanism of poly(benzyl methacrylate) (PBMA).
  • To observe the structural evolution during thermal depolymerization using time-resolved small-angle X-ray scattering (SAXS).

Main Methods:

  • Synthesis of PBMA via RAFT polymerization.
  • Monitoring depolymerization in solution at 120 °C in p-xylene.
  • Utilizing time-resolved small-angle X-ray scattering (SAXS) to track molecular weight and radius of gyration.

Main Results:

  • Weight-average molecular weight decreased gradually during depolymerization.
  • Z-average radius of gyration remained largely constant until approximately 50% conversion.
  • Observed behavior was consistent with an end-to-end depolymerization (unzipping) model.

Conclusions:

  • The study provides the first direct observation of structural changes during polymer depolymerization via an unzipping mechanism.
  • The findings support a model where depolymerization proceeds from chain ends without significant changes in overall polymer dimensions until advanced conversion.