Aromatic Polymethacrylates from Lignin-Based Feedstock: Synthesis, Thermal Properties, Life-Cycle Assessment and...

Area of Science:

• Polymer Chemistry
• Materials Science
• Biotechnology

Background:

• Growing demand for sustainable alternatives to fossil-based polymers.
• Need for rigid, high-performance, and processable bio-based plastics.
• Lignin as a renewable resource for polymer synthesis.

Purpose of the Study:

• To synthesize and polymerize lignin-derived methacrylate monomers.
• To evaluate the properties and performance of these novel bio-based polymers.
• To assess the environmental and toxicological profiles of the new materials.

Main Methods:

• Synthesis of methacrylate monomers from lignin-derived acids (4-hydroxybenzoic, vanillic, syringic).
• Polymerization of monomers to form homopolymers and copolymers with methyl methacrylate.
• Characterization of polymers including glass transition temperature (T_g), rheological properties, and thermal stability.
• Life-cycle assessment (LCA) and cytotoxicity testing against human HeLa cell lines.

Main Results:

• Homopolymethacrylates achieved high glass transition temperatures (106°C, 128°C, 197°C).
• Polymers demonstrated melt-processability with thermal stability up to 277°C.
• Life-cycle assessment showed comparable or slightly higher environmental impact than fossil-based methyl methacrylate.
• Cytotoxicity testing indicated favorable comparison to poly(methyl methacrylate).

Conclusions:

• Lignin-derived polymers offer a promising route to rigid, high-T_g thermoplastic materials.
• Straightforward synthesis and potential for upscaling make these materials attractive.
• These bio-based polymers present a viable, low-toxicity alternative to conventional plastics.