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Mass Spec and AI Team Up To Determine Monomeric Polymer Sequences

A diagram showing how the mass to charge ratio of a polymer translates to its monomeric sequence.
The analyte polymer (lower left) contains different types of short sequences along polymer chains (i.e., random copolymers). AI rearranges these random copolymers into periodic copolymers repeating a single codon species (lower right). This rearrangement enables the quantification of codons, i.e., short sequences. Credit: Masanobu Naito National Institute for Materials Science
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The National Institute for Materials Science (NIMS) has developed an AI-based mass spectrometric technique capable of determining the monomeric sequence of a polymer. This technique may be useful in gaining a deeper understanding of basic polymeric structures, facilitating the development of new materials and helping solve plastic recycling problems.


A polymer is a very large molecule composed of a chain of many (ranging from hundreds to hundreds of thousands) small molecules called monomers that are bonded together. Many common polymers (e.g., plastics and resins) are copolymers, consisting of several different types of monomers. During the copolymerization process, the monomers are stochastically arranged along the main-chain, generating sequence distribution. Since this sequence distribution is thought to greatly influence the material performance of copolymeric materials, the development of a polymer sequencer—an analytical method for quantitatively evaluating the distribution—had been awaited as a potentially effective tool toward innovative polymer materials.

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This research team recently developed the world’s first practical polymer sequencer quantifying the short monomer segments in specific sequences, herein called “codon” using an analogy from nucleotide triplets, via pyrolysis mass-spectra. In this technique, an analyte copolymer is gradually heated from room temperature to 600oC, successively generating oligomeric fragments to be recorded by mass-spectrometry in order of their heat susceptibilities.  Based on the fragment patterns, virtual copolymers repeating a single codon species are reconstructed via AI analysis, allowing the quantification of the codon composition in the analyte. This polymer sequencer is applicable to various combinations of versatile monomers. In addition, the polymer sequencer may be used to analyze various other materials whose fragments vaporize during thermal treatment. These include insoluble or non-liquefiable sample materials and composites with inorganic constituents.


The research team plans to investigate the correlation between sequence distribution and copolymer properties and develop sequence-controlled polymerization techniques, using the developed polymer sequencer as the key technology. This attempt could improve the performance of various polymer materials and tackle environmental issues caused by plastics.

 

Reference: Hibi Y, Uesaka S, Naito M. A data-driven sequencer that unveils latent “codons” in synthetic copolymers. Chem Sci. 2023;14(21):5619-5626. doi: 10.1039/D2SC06974A


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