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Biodegradable PLA/PHB Composites with Inorganic Fillers and Modifiers.

Jozef Feranc¹, Martina Repiská², Roderik Plavec¹

¹Institute of Natural and Synthetic Polymers, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia.

|October 28, 2025

Summary

This study explores how inorganic fillers and modifiers impact biodegradable polylactic acid/polyhydroxybutyrate (PLA/PHB) blends. Specific filler-modifier combinations are crucial for tailoring material properties like degradation and barrier performance.

Keywords:

biodegradable polymer blend degradation inorganic filler modifier polyhydroxybutyrate polylactic acid

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Area of Science:

Polymer Science
Materials Science
Sustainable Materials

Background:

Biodegradable polymers like PLA/PHB offer eco-friendly alternatives but often require property enhancement.
Inorganic fillers and modifiers are commonly used to tailor polymer performance.
Understanding filler-modifier interactions is key to optimizing biodegradable polymer applications.

Purpose of the Study:

To investigate the influence of various inorganic fillers and modifiers on PLA/PHB blend properties.
To determine the role of filler surface chemistry and morphology in blend performance.
To identify optimal filler-modifier combinations for enhanced material characteristics.

Main Methods:

Incorporation of ten inorganic fillers (talc, Mg(OH)2, Al(OH)3, CaCO3, SiO2) and three modifiers into PLA/PHB blends.
Evaluation of rheological, thermal, and mechanical properties of the modified blends.
Analysis of filler-modifier interactions and their impact on degradation behavior.

Main Results:

Fillers with reactive OH groups accelerate PLA/PHB degradation, an effect mitigated by reactive modifiers.
Specific modifier-filler interactions necessitate careful selection of combinations.
PLA/PHB blends with magnesium hydroxide show potential for reduced flammability.
Talc addition enhances the barrier properties of the PLA/PHB mixture.

Conclusions:

Filler surface chemistry and morphology significantly influence PLA/PHB blend properties.
Tailored filler-modifier selection is essential for controlling degradation and enhancing performance.
Optimized PLA/PHB blends offer pathways to developing advanced, environmentally friendly materials.