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Chemical Modification of Lignin by Polymerization and Depolymerization

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Lignin

Abstract

Over the past few years, lignin is seen as the remaining part after paper production or biofuels extraction; the most common method to get rid of it by giving it a profitable use has been burning it in a recovery container for steam production which provides enough energy to power their processes. However, the increase in production has left a higher volume of residual lignin than energy demand. So this vast amount of lignin produced as a by-product has gained increasing interest and attention of researchers to use it as a bio-sourced to develop value-added materials. Lignin has a complex structure with phenolic and aliphatic hydroxyl groups, which make it a promising alternative for the production of several chemical compounds. Different chemical modifications have been applied to transform lignin into new materials, either by polymerization which uses lignin as a monomer in the synthesis of polymers or either by creating new reactive sites or by structural modification of the functional groups already existing in the lignin. In addition to that, depolymerization of lignin is another option which involves its fragmentation into smaller molecules having higher reactivity that can be utilized for the synthesis of biobased polymers and biofuels.

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Acknowledgements

This book chapter was possible thanks to the financial support received from the National Council of Science and Technology (CONACyT, Mexico).

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Correspondence to Aman Ullah .

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Lopez-Camas, K., Arshad, M., Ullah, A. (2020). Chemical Modification of Lignin by Polymerization and Depolymerization. In: Sharma, S., Kumar, A. (eds) Lignin. Springer Series on Polymer and Composite Materials. Springer, Cham. https://doi.org/10.1007/978-3-030-40663-9_5

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