Biobased Polymer Synthesis and Characterization

Biobased polymers are macromolecular materials whose monomeric units originate from renewable biological feedstocks such as sugars, lignocellulosic residues and carbon dioxide derivatives. Synthesis strategies encompass step-growth polycondensation, ring-opening polymerisation and emerging enzymatic and catalytic routes, each offering control over molecular weight, dispersity and end-group functionality. Tailoring polymer microstructure through copolymerisation or incorporation of functional units enables fine tuning of thermal transitions, crystallinity and mechanical strength. Characterisation relies on a suite of analytical methods: nuclear magnetic resonance spectroscopy for compositional analysis; gel permeation chromatography for molecular weight distribution; differential scanning calorimetry and thermogravimetric analysis for thermal behaviour; wide-angle X-ray scattering and optical microscopy for morphological assessment; alongside tensile testing and barrier measurements to evaluate performance under application-relevant conditions. The confluence of sustainable feedstock utilisation, design for recyclability or biodegradability and high-performance criteria has driven the field towards packaging, coatings and super-engineering materials, matching or surpassing petrochemical analogues while contributing to carbon-neutral and circular-economy imperatives.

Research from Nature Portfolio

Recent studies have achieved rapid synthesis of high-molecular-weight furan-based polyesters via bulk ring-opening polymerisation of cyclic oligomers, delivering bottle-grade materials within minutes and avoiding thermal degradation and discolouration. Optimisation of initiator systems and plasticiser-mediated melt processing has yielded polymers with number-average molecular weights exceeding 30 kg mol–1, high conversion rates and excellent optical clarity. In parallel, the development of a fully biobased super-engineering thermoplastic derived from an alicyclic diol demonstrates a glass transition above 200 °C, tensile strengths nearing 80 MPa and robust melt-processability. This material leverages a phase-transfer catalyst to produce high-molecular-weight chains at kilogram scale, combining outstanding thermal stability, recyclability and mechanical performance previously unattained by bio-derived plastics or conventional petrochemical super-engineering polymers.

Biobased Polymer Synthesis and Characterization publication trend

The graph below shows the total number of articles in biobased polymer synthesis and characterization across all publications each year (not limited to Nature Index journals).

Technical terms

Biobased polymer: A polymer synthesised from monomers sourced from renewable biological materials rather than fossil fuels.

Step-growth polycondensation: A polymerisation mechanism in which bi-functional monomers react to form oligomers and eventually high-molecular-weight chains.

Ring-opening polymerisation (ROP): A chain-growth process where cyclic monomers open to form linear polymers, often enabling rapid synthesis and high control over molecular weight.

Copolymerisation: The incorporation of two or more distinct monomer types into a single polymer chain to achieve tailored properties.

Glass-transition temperature (Tg): The temperature at which an amorphous polymer transitions from a rigid to a rubbery state.

Crystallinity: The degree of ordered molecular packing within a polymer, influencing mechanical strength and barrier performance.

Barrier properties: The resistance of a polymer film to permeation by gases or vapours, critical for packaging applications.

References

1. Bottle-grade polyethylene furanoate from ring-opening polymerisation of cyclic oligomers. Nature Communications (2018).
2. Sustainable and recyclable super engineering thermoplastic from biorenewable monomer. Nature Communications (2019).
3. Relationship between Composition and Environmental Degradation of Poly(isosorbide-co-diol oxalate) (PISOX) Copolyesters. Environmental Science and Technology (2024).
4. Improved chemical recyclability of 2,5-furandicarboxylate polyesters enabled by acid-sensitive spirocyclic ketal units. Green Chemistry (2024).
5. The global warming potential and the material utility of PET and bio-based PEF bottles over multiple recycling trips. Journal of Cleaner Production (2023).