Supramolecular colloidal assembly of flow hydrolysis hardwood lignin from Dawn technology™ process

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Journal ISSN

Volume Title

Kemian tekniikan korkeakoulu | Master's thesis

Date

2022-05-17

Department

Major/Subject

Fibre and Polymer Engineering

Mcode

CHEM3024

Degree programme

Master's Programme in Chemical, Biochemical and Materials Engineering

Language

en

Pages

59

Series

Abstract

The efficient utilization of the industrial side streams has been challenging for many years and the demand for the development of potentially feasible applications of the industrial side streams with high added value is continuously increasing. Here in this work, we utilized the hardwood hydrolysis lignin (HWDL2) received from Avantium as a precursor for nanoparticle synthesis. Various solvents are applied in this work to study their influence on the yield and morphology of produced colloidal lignin nanoparticles (CLPs). The binary solvents formed with the mixture of organic solvent and water show better dissolving capacity than pure organic solvents. The particle size of obtained CLPs has a negative correlation with the relative polarity of the solvent used during lignin fractionation. Another industrial lignin sample provided by St1 Oy was used to evaluate the possibility of making bio-based nanocomposites by melt blending it with thermoplastic starch (TPS), and D-sorbitol. The prepared composite exhibits an increase in tensile stress from 1.49 MPa to 2.05 MPa, whereas the modulus increased from 31.9 MPa to 227.3 MPa, which is higher than the previously reported lignin/TPS composite in literature. Overall, our findings provide a well-defined method for the valorization of hydrolysis lignin. The nano-composite prepared from Lignin1 and TPS shows excellent mechanical properties compared with the previously reported lignin/TPS composites.

Description

Supervisor

Österberg, Monika

Thesis advisor

Muhammad, Farooq

Keywords

biorefinery lignin, dissolution, colloidal lignin nanoparticles, thermoplastic starch, nanocomposite

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