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Controlled polymerisation and purification of branched poly(lactic acid) surfactants in supercritical carbon dioxide

Goddard, Amy R.; Pérez-Nieto, Sara; Passos, Thayse Marques; Quilty, Brid; Carmichael, Kim; Irvine, Derek J.; Howdle, Steven M.

Authors

Amy R. Goddard

Sara Pérez-Nieto

Thayse Marques Passos

Brid Quilty

Kim Carmichael

Derek J. Irvine



Abstract

Product degradability, sustainability and low-toxicity are driving demand for the synthesis of biobased polymers and surfactants. Here we report the synthesis of novel surface active polymers using cyclic esters (D,L-lactide) and temperature sensitive polyols (D-sorbitol) as renewable building blocks. We highlight the modification of chain length and degree of branching to provide a route to tailoring the properties and application performance of these new compounds. High processing temperatures (≥180 °C) and harsh post-reaction treatments are often needed to remove residual monomer and catalysts and these can become barriers to creating materials based on renewable resources. Here we exploit supercritical carbon dioxide (scCO2) as a green solvent to overcome these challenges; significantly reducing reaction temperatures, targeting controlled molecular weights with narrow dispersities and reducing sideproduct formation. Additionally in the same pot, we can use supercritical extraction to purify the compounds and to efficiently remove unreacted reagents, which could be recovered and recycled. We believe that our approach to the production and purification of these novel branched poly(lactides) is a significant step towards the development of the next generation of biopolymers and green surfactants, combining both the use of bio-sourced raw materials and the potential to use sustainable, low energy processes and techniques.

Citation

Goddard, A. R., Pérez-Nieto, S., Passos, T. M., Quilty, B., Carmichael, K., Irvine, D. J., & Howdle, S. M. (in press). Controlled polymerisation and purification of branched poly(lactic acid) surfactants in supercritical carbon dioxide. Green Chemistry, https://doi.org/10.1039/c6gc00745g

Journal Article Type Article
Acceptance Date May 26, 2016
Online Publication Date Jun 6, 2016
Deposit Date Jul 5, 2016
Publicly Available Date Jul 5, 2016
Journal Green Chemistry
Print ISSN 1463-9262
Electronic ISSN 1463-9270
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1039/c6gc00745g
Keywords Polymers, Surfactants, Supercritical Carbon Dioxide
Public URL http://eprints.nottingham.ac.uk/id/eprint/34636
Publisher URL http://pubs.rsc.org/en/Content/ArticleLanding/2016/GC/C6GC00745G#!divAbstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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