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Structural evolution during inverse vulcanization.

Botuo Zheng1, Liling Zhong1, Xiaoxiao Wang1

  • 1College of Chemistry and Materials Science, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, 350007, China.

Nature Communications
|July 1, 2024
PubMed
Summary
This summary is machine-generated.

Inverse vulcanization uses sulfur (S8) to create polysulfides. This study reveals the three stages of inverse vulcanization and how different monomers affect polysulfide network formation and degradation.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Inverse vulcanization is a method for synthesizing polysulfides using elemental sulfur (S8).
  • The detailed mechanism and product evolution during inverse vulcanization remain poorly understood.
  • Understanding these processes is crucial for controlling the properties of resulting polysulfide materials.

Purpose of the Study:

  • To elucidate the mechanism and product evolution during inverse vulcanization.
  • To characterize the different stages of the inverse vulcanization process.
  • To investigate the influence of various monomers on polysulfide network formation and stability.

Main Methods:

  • Monitoring inverse vulcanization using rheological measurements to obtain characteristic curves.
  • Analyzing the degradation pathways of polysulfide networks formed from different monomers (aromatic alkenes, olefins, dicyclopentadiene).
  • Employing computational calculations to confirm proposed reaction mechanisms.

Main Results:

  • Inverse vulcanization proceeds through three distinct stages: induction, curing, and over-cure.
  • Polysulfide network stability and degradation mechanisms vary significantly with monomer type.
  • Aromatic alkenes lead to thiocarbonyl formation and network degradation, while olefins yield thiophenes and slower degradation.
  • Dicyclopentadiene shows a plateau in the over-cure stage.

Conclusions:

  • The study clarifies the stages and mechanisms of inverse vulcanization.
  • Monomer choice critically influences polysulfide network structure, stability, and degradation pathways.
  • Computational analysis supports proposed reaction mechanisms involving sulfur-substituted alkenyl intermediates.