Fully Bio-Based, Tough, and Room-Temperature Shape Adaptive Poly(lactic acid) Blend for Green Electronics

Area of Science:

• Materials Science
• Polymer Chemistry
• Sustainable Engineering

Background:

• Growing e-waste necessitates sustainable alternatives to conventional plastics.
• Poly(lactic acid) (PLA) is a promising bio-based polymer but lacks toughness and shape adaptability for advanced applications.
• Current limitations hinder PLA's widespread use in green electronics.

Purpose of the Study:

• To develop a high-performance, fully bio-based Poly(lactic acid) (PLA) blend with enhanced toughness and room-temperature shape adaptability (RTSA).
• To overcome PLA's inherent brittleness and improve its suitability for green electronic components.
• To explore a facile method for creating advanced bio-based materials.

Main Methods:

• Melt blending of Poly(lactic acid) (PLA) with a low-molecular-weight bio-based polyester (l-BPE).
• Characterization of the blend's mechanical properties, including toughness and tensile strength.
• Evaluation of room-temperature shape adaptability (RTSA) and shape fixation rates.
• Assessment of the material's performance as a wire protective layer in deformed states.

Main Results:

• The PLA/l-BPE20 blend exhibited significantly improved toughness (71.9 ± 5.6 MJ/m³) and tensile strength (39.5 ± 1.1 MPa).
• Excellent room-temperature shape adaptability (RTSA) was achieved, with high shape fixation rates (>99% tensile, >82% bending).
• The blend maintained circuit integrity in complex shapes, outperforming neat PLA and PBAT-based materials.

Conclusions:

• Incompatible blending of PLA with l-BPE effectively toughens the polymer via microcracking while retaining high glass transition temperature.
• The developed bio-based blend offers superior RTSA, crucial for durable and flexible green electronics.
• This strategy provides a viable pathway for high-performance, sustainable bio-based polymers in the electronics industry.