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Recent developments in sonochemical polymerisation.

Gareth J Price1

  • 1Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK. g.j.price@bath.ac.uk

Ultrasonics Sonochemistry
|June 24, 2003
PubMed
Summary
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High intensity ultrasound accelerates step-growth polymerization for polyesters and polyurethanes. While it enhances reaction speed and polymer molecular weight, specific conditions can cause depolymerization in some polyester types.

Area of Science:

  • Polymer Chemistry
  • Sonochemistry
  • Materials Science

Background:

  • Step-growth polymerization is a fundamental process for creating polymers like polyesters and polyurethanes.
  • Ultrasound irradiation is known to influence chemical reactions through various physical effects.

Purpose of the Study:

  • To investigate the effect of high-intensity ultrasound on two types of step-growth polymerization: polyester synthesis and polyurethane preparation.
  • To determine if sonication can enhance reaction rates and polymer properties.

Main Methods:

  • Applying 20 kHz high-intensity ultrasound to the ring-opening polymerization of cyclic lactones to form polyesters.
  • Applying ultrasound to the synthesis of polyurethanes from diisocyanates and diols.
  • Analyzing the effect of ultrasound intensity on reaction kinetics and molecular weight.

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Main Results:

  • Ultrasound accelerated the ring-opening polymerization of cyclic lactones, but also induced depolymerization in delta-valerolactone, reducing molecular weight over time.
  • Sonication consistently enhanced the early stages of polyurethane synthesis, leading to higher molecular weight polymers.
  • The study explored the impact of varying ultrasound intensity on these polymerization processes.

Conclusions:

  • High-intensity ultrasound can be a beneficial tool for accelerating step-growth polymerization, particularly for polyurethanes, leading to improved molecular weights.
  • Careful control of sonication parameters is necessary, as demonstrated by the depolymerization observed in specific polyester systems.
  • Further investigation into the mechanisms behind ultrasound-induced acceleration and potential degradation is warranted.