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Branched Polyurethanes Based on Synthetic Polyhydroxybutyrate with Tunable Structure and Properties.

Joanna Brzeska1, Anna Maria Elert2, Magda Morawska3

  • 1Department of Commodity Industrial Science and Chemistry, Gdynia Maritime University, 83Morska Street, 81-225 Gdynia, Poland. j.brzeska@wpit.am.gdynia.pl.

Polymers
|April 10, 2019
PubMed
Summary

Branched and linear polyurethanes (PURs) were synthesized and analyzed. Adjusting branching and poly([R,S]-3-hydroxybutyrate) content in PURs effectively controlled their thermal and sorptive behaviors, impacting oil and water absorption.

Keywords:
linear and branched polyurethanespolyurethane structuresorptive propertiessynthetic polyhydroxybutyratethermal properties

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Aliphatic polyurethanes (PURs) are versatile polymers with tunable properties.
  • Understanding the structure-property relationships in branched PURs is crucial for advanced applications.

Purpose of the Study:

  • To synthesize and compare branched aliphatic polyurethanes (PURs) with their linear counterparts.
  • To investigate the influence of polycaprolactonetriol and poly([R,S]-3-hydroxybutyrate) (R,S-PHB) in soft segments on PUR properties.
  • To determine how branching and R,S-PHB content affect thermal and sorptive characteristics.

Main Methods:

  • Synthesis of branched and linear aliphatic polyurethanes.
  • Fourier-transform infrared (FTIR) and Raman spectroscopies to analyze chemical structure and hydrogen bonding.
  • Differential scanning calorimetry (DSC) to assess thermal properties, including melting enthalpies.
  • Sorption experiments to quantify oil and water absorption.

Main Results:

  • Increased R,S-PHB content in branched PURs reduced urethane group hydrogen bonding.
  • Linear PURs exhibited higher crystallinity and melting enthalpies compared to branched PURs.
  • PURs with polycaprolactone soft segments showed higher oil sorption; branched PURs without R,S-PHB absorbed the most oil.
  • Incorporation of R,S-PHB into PURs enhanced water sorption.

Conclusions:

  • The degree of branching and the amount of R,S-PHB in soft segments are key factors for controlling PUR properties.
  • Tailoring PUR architecture allows for targeted modification of thermal stability and sorption capabilities.
  • These findings offer pathways for designing specialized aliphatic polyurethanes for specific applications.