The highest heat-resistant plastic ever is developed from biomass

Developing novel energy-efficient materials using biomass is frontiers to establish a sustainable environment. Plastics lightweight in nature produced from renewable biomass are prerequisites for developing a circular economy. However, currently available bioplastics are mostly aliphatic (e.g.; PLA, PHA, PA11, etc.) and thus consists of poor thermostability, which restricts their further applications. Aromatic backbone-based polymers are widely considered for their high heat-resistance (e.g; Zylon®, Celazole®, Kapton®, etc.) but developing aromatic heterocyclic monomers from biomass are rare due to difficulty in controlling their structure.

Two specific aromatic molecules, 3-amino-4-hydroxybenzoic acid (AHBA) and 4-aminobenzoic acid (ABA) were produced from kraft pulp, an inedible cellulosic feedstock by Prof. Ohnishi and his research team in U-Tokyo. Recombinant microorganisms enhanced the productivity of the aromatic monomers selectively and inhibited the formation of the side products. Prof. Kaneko and his research team in JAIST have chemically converted AHBA into 3,4-diaminobenzoic acid (DABA); which was subsequently polymerized into poly(2, 5-benzimidazole) (ABPBI) via polycondensation and processed into thermoresistant film. Also, incorporating a very small amount of ABA with DABA dramatically increases the heat-resistance of the resulting copolymer and processed film attributes to the highest thermostable plastic on record. Density functional theory (DFT) calculations confirmed the small ABA incorporation strengthened the interchain hydrogen bonding between imidazoles although π-conjugated benzene/heterocycle repeats have been considered as the most ideal thermoresistant plastics for around 40 years.

Organic plastic superior in thermostability (over 740 °C), was developed from inedible biomass feedstocks without using heavy inorganic fillers and thus lightweight in nature. Such an innovative molecular design of ultra-high thermoresistance polymers by controlling π-conjugation can contribute to establishing a sustainable carbon negative society, and energy conservation by weight saving.