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Bio-Polyester/Rubber Compounds: Fabrication, Characterization, and Biodegradation.

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|June 28, 2023
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Summary
This summary is machine-generated.

Natural rubber (NR) effectively softens brittle poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) without fossil-based plasticizers. These new NR-PHBV blends are durable, elastic, and biodegradable, offering sustainable material solutions.

Keywords:
bio-polyesterbiodegradationcompoundingnatural rubberpoly(3-hydroxybutyrate-co-3-hydroxyvalerate)poly(hydroxyalkanoates)

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biotechnology

Background:

  • Biobased and biodegradable polymers (BBDs) like poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) are eco-friendly alternatives to fossil plastics.
  • PHBV's high crystallinity and brittleness limit its applications.
  • There is a need for effective, non-fossil-based plasticizers to improve PHBV's mechanical properties.

Purpose of the Study:

  • To investigate the suitability of natural rubber (NR) as an impact modifier for PHBV.
  • To develop softer and more durable PHBV-based materials using NR.
  • To assess the biodegradability of the resulting NR-PHBV blends.

Main Methods:

  • Mechanical mixing (roll mixer and/or internal mixer) of NR and PHBV at varying proportions.
  • Radical C-C crosslinking for sample preparation.
  • Characterization using size exclusion chromatography, FTIR, SEM, thermal analysis, XRD, and mechanical testing.
  • Biodegradability assessment using depolymerases, pH shift assays, and SEM analysis.

Main Results:

  • NR-PHBV blends demonstrated excellent elasticity and durability.
  • SEM analysis confirmed successful integration of NR within the PHBV matrix.
  • Enzymatic degradation of the PHBV component was confirmed through pH shift assays and surface morphology changes.
  • The biodegradability of the NR-PHBV blends was successfully demonstrated.

Conclusions:

  • Natural rubber (NR) is a highly suitable and sustainable alternative to fossil-based plasticizers for PHBV.
  • NR-PHBV blends exhibit superior material characteristics, including enhanced elasticity and durability.
  • These biodegradable NR-PHBV blends represent promising materials for diverse applications, promoting environmental sustainability.