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Optimizing bio-based polyester synthesis, this study compares transesterification kinetics of acetalised galactarate esters. Higher nitrogen flow rates significantly increase polymer molecular weight, enhancing thermal and mechanical properties.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science

Background:

  • Recent advancements in bio-based polymer synthesis, particularly polyesters, show promise.
  • Optimization of reaction conditions for conversion and time remains a critical research gap.

Purpose of the Study:

  • To investigate and compare the kinetics of transesterification reactions involving two distinct acetalised galactarate esters.
  • To optimize reaction parameters, specifically catalyst concentration and nitrogen flow rate, for improved polyester synthesis.

Main Methods:

  • Transesterification of acetalised galactarate esters with 1,6-hexanediol.
  • Kinetic analysis focusing on conversion rates under varying di-butyltin oxide (DBTO) catalyst concentrations and N₂ flow rates.
  • Characterization of resulting polyesters, including thermal, mechanical, and dielectric properties, and assessment of stability in acidic conditions.

Main Results:

  • Polymerization molecular weight more than doubled with a 250 mL/min N₂ flow compared to static conditions.
  • Varying DBTO concentration and N₂ flow rate significantly impacts reaction kinetics and product molecular weight.
  • Characterization revealed distinct thermal, mechanical, and dielectric properties influenced by acetal groups and reaction conditions.

Conclusions:

  • Nitrogen flow rate is a critical parameter for enhancing molecular weight in bio-based polyester synthesis.
  • Acetal groups influence the stability of the synthesized polyesters, particularly under acidic conditions.
  • The study provides valuable insights into optimizing the synthesis of high-performance bio-based polyesters.