Ionic Liquids in Biopolymer Compatibilization
Summary
Ionic liquids are a class of low-vapour-pressure solvents composed entirely of cations and anions, whose tunable structures enable precise interactions with biopolymers such as starch, chitosan, cellulose and poly(lactic acid). By selectively disrupting hydrogen‐bonding networks and modifying interfacial energies, these designer solvents serve as both plasticisers and compatibilisers in otherwise immiscible biopolymer blends. Their incorporation can enhance chain mobility, reduce processing temperatures, tailor morphology and improve mechanical strength and barrier performance. Moreover, specific ionic liquid chemistries can accelerate biodegradation or impart functional properties such as antimicrobial activity and electrochemical conductivity. Although offering clear sustainability benefits over conventional volatile organic solvents, challenges remain in cost-effective synthesis, recyclability and ecotoxicity. Overall, ionic liquids represent a versatile toolbox for engineering next-generation bio-derived materials in packaging, agriculture, biomedical devices and sustainable composites.
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Ionic Liquids in Biopolymer Compatibilization publication trend
The graph below shows the total number of articles in ionic liquids in biopolymer compatibilization across all publications each year (not limited to Nature Index journals).
Technical terms
Ionic liquid: A salt in the liquid state at or near ambient temperature, composed entirely of organic or inorganic ions, notable for negligible vapour pressure and tunable solvation properties.
Biopolymer: A polymeric material derived from living organisms, including polysaccharides (starch, cellulose), proteins (gelatin, chitosan) and bio‐based polyesters (PLA, PBS).
Compatibilization: The process of improving interfacial adhesion and uniform dispersion in polymer blends by reducing interfacial tension or creating covalent links between phases.
Plasticiser: A low-molecular-weight additive that increases polymer chain mobility, lowers processing temperatures and enhances flexibility and elongation at break.
Glass transition temperature: The temperature region at which an amorphous polymer transitions from a glassy, rigid state to a rubbery, flexible state, marking the onset of segmental chain mobility.
References
- Ionic Liquids as Designed, Multi-Functional Plasticizers for Biodegradable Polymeric Materials: A Mini-Review. International Journal of Molecular Sciences (2024).
- Epoxidized Ionic Liquids as Processing Auxiliaries of Poly(Lactic Acid) Matrix: Influence on the Manufacture, Structural and Physical Properties. Nanomaterials (2023).
- Impact of Ionic Liquids on the (bio)degradability of Poly(butylene succinate)/Poly(lactic acid) blends. Frontiers in Materials (2022).
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