Filament fabrication and fdm 3D printing of pla/biopbs-based composite materials for advanced sustainable manufacturing applications

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dc.contributor.advisorSkordos, Alexandros A.
dc.contributor.advisorThakur, Vijay Kumar
dc.contributor.authorDaminabo, Samuel I. C.
dc.date.accessioned2025-05-14T14:22:31Z
dc.date.available2025-05-14T14:22:31Z
dc.date.freetoread2025-05-14
dc.date.issued2023-06
dc.description.abstractWith the limited range of commercially viable biobased and biodegradable filament materials available for fused deposition modelling (FDM)-based additive manufacturing (AM), this work aims to advance the knowledge and potential of sustainable polymer-based materials for 3D printing (3DP) applications. This work investigates polymer phase changes in 80 wt.% poly lactic acid (PLA)/20 wt.% biobased polybutylene succinate (BioPBS)-based blends after a direct or two-step filament fabrication process. 3DP filaments made of 80 wt.% PLA /20 wt.% BioPBS blends and their nanocomposites containing either hydrophilic bentonite nano clay (HbnC) or reduced graphene oxide (rGO) at 1 part per hundred resins (phr) are compared for polymer phase properties and rheological behaviour. Subsequently, ‘Power law’ and ‘Arrhenius’ models are combined to develop complex viscosity master-curves as a predictive model for each material formulation; while each fabricated filament is applied with developed 3D printing strategies to produce tensile and interlayer-bond test materials. Findings show that between the two filament fabrication methods, the multi-step filament fabrication route causes a higher PLA phase crystallinity of about 27%. However, the multi-step processing route and inclusion of rGO in the PLA80/BioPBS20 material matrix increases PLA crystallinity to about 34%. Moreover, rGO is found to limit the recrystallization of the BioPBS phase. Furthermore, following a successful development of complex viscosity master curve models for PLA80/BioPBS20-based formulations, tensile-fractured 3D- printed parts were also found to show an improved compatibilization of the immiscible PLA and BioPBS phases upon addition of either nanomaterial, hence offering a promising outlook for the use of PLA80/BioPBS20-based materials for sustainable and multifunctional part productions.
dc.description.coursenamePhD in Manufacturing
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23885
dc.language.isoen
dc.publisherCranfield University
dc.publisher.departmentSATM
dc.rights© Cranfield University, 2023. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder.
dc.subject3D printing
dc.subjectbiocomposites
dc.subjectmelt-processing
dc.subjectcrystallinity
dc.subjectviscosity
dc.subjecttensile
dc.subjectmechanical
dc.subjectmultifunctional
dc.titleFilament fabrication and fdm 3D printing of pla/biopbs-based composite materials for advanced sustainable manufacturing applications
dc.typeThesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhD

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PhD, EngD and MSc by research theses (SATM)