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An Integrated Approach to the Design of PHBV-Based Blends: Structure-Property-Performance Relationships for

Karlo Grgurević1, Martina Miloloža Nikolić1, Dajana Kučić Grgić1

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This study explores blends of polylactide (PLA) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) for sustainable packaging. Blending enhances thermal stability and barrier properties, with PLA65/PHBV offering a balanced biodegradation profile.

Keywords:
biodegradable polymerscompostable packagingpoly(3-hydroxybutyrate-co-3-hydroxyvalerate)polylactidepolymer blends

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Area of Science:

  • Materials Science
  • Polymer Science
  • Sustainable Materials

Background:

  • Petroleum-based polymers raise environmental concerns, driving demand for biodegradable alternatives.
  • Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a promising biodegradable polymer but requires modification for enhanced functionality.
  • Blending PHBV with polylactide (PLA) is explored to improve properties for compostable packaging.

Purpose of the Study:

  • To investigate structure-property relationships in PLA/PHBV blends for compostable packaging.
  • To determine the effects of varying PLA and PHBV content on blend morphology, thermal behavior, barrier properties, and biodegradation.

Main Methods:

  • Preparation and characterization of PLA/PHBV blends with varying compositions (65-85 wt.% PLA).
  • Analysis of blend miscibility, morphology, thermal properties (glass transition, melting), and degradation temperatures.
  • Evaluation of barrier properties (oxygen and water vapor transmission rates).
  • Assessment of biodegradation behavior under compostable conditions.

Main Results:

  • Blends exhibited partial miscibility with composition-dependent morphology and thermal properties.
  • Increased PLA content (≥80 wt.%) improved thermal stability, raising degradation temperature to 288.0 °C.
  • Higher PHBV content (≥25 wt.%) significantly enhanced barrier properties, reducing O2 and WVTR.
  • Biodegradation occurred preferentially in the PHBV phase, with complete PHBV degradation in 56 days.
  • PLA65/PHBV blend demonstrated a balanced profile of barrier, mechanical, and biodegradation properties.

Conclusions:

  • Tailoring the composition of PLA/PHBV blends allows for the design of effective sustainable packaging materials.
  • PLA/PHBV blends offer a viable route to enhance the performance of biodegradable polymers.
  • The PLA65/PHBV composition presents a promising candidate for compostable packaging applications.