Staff View: Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning

Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning

In this study, modified coaxial electrospinning (CE) was employed to improve electrospinnability and to tailor surface morphology and bead formation of poly(lactic acid) (PLA) fibers by means of core-to-shell flowrate ratio variation. Chloroform/N,N-dimethylformamide (DMF) mixture was used as sheath...

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Main Authors:	Abdullah, Muhammad Faiq, Andriyana, Andri, Muhamad, Farina, Ang, Bee Chin
Format:	Article
Published:	Elsevier 2021
Subjects:	TA Engineering (General). Civil engineering (General) TP Chemical technology
Online Access:	http://eprints.um.edu.my/26407/
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spelling	my.um.eprints.264072022-02-28T00:27:33Z http://eprints.um.edu.my/26407/ Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning Abdullah, Muhammad Faiq Andriyana, Andri Muhamad, Farina Ang, Bee Chin TA Engineering (General). Civil engineering (General) TP Chemical technology In this study, modified coaxial electrospinning (CE) was employed to improve electrospinnability and to tailor surface morphology and bead formation of poly(lactic acid) (PLA) fibers by means of core-to-shell flowrate ratio variation. Chloroform/N,N-dimethylformamide (DMF) mixture was used as sheath solution which serves as a protective layer to prevent rapid solidification of PLA droplet causing needle clogging. Five different core-to-shell flowrate ratios yielded beads-on-a-string PLA fibers with distinctive fiber and bead properties. These diverse morphologies were characterized in terms of fiber diameter (D-f), fiber percentage (P-f), number of beads per area (n(b)), bead area (A(b)), bead aspect ratio (L-b/D-b), ratio of bead-to-fiber diameter (D-b/D-f) and surface roughness. From thermal analysis, crystallinity of PLA fibers was shown to be significantly dependent on the fiber processing history, where higher degree of molecular chain orientation and longer jet flight time correspond to higher crystallinity values. Core-to-shell flowrate ratio of 1:3 resulted in PLA fibers with the least nb, smallest D-b/D-f and highest L-b/D-b (spindle-like shape), which correspond to the highest tensile properties and minimum hydrophobicity among beads-on-a-string fibers studied, as indicated by effective stress-strain curve and water contact angle measurement. Furthermore, the results suggested that D-b/D-f was the dominant factor affecting tensile properties more than the effect of crystallinity, while L-b/D-b (bead shape) was the key aspect which influenced the wettability of the PLA beads-on-a-string fibers. Elsevier 2021-12 Article PeerReviewed Abdullah, Muhammad Faiq and Andriyana, Andri and Muhamad, Farina and Ang, Bee Chin (2021) Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning. Polymer, 237. ISSN 0032-3861, DOI https://doi.org/10.1016/j.polymer.2021.124378 <https://doi.org/10.1016/j.polymer.2021.124378>. 10.1016/j.polymer.2021.124378
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	TA Engineering (General). Civil engineering (General) TP Chemical technology
spellingShingle	TA Engineering (General). Civil engineering (General) TP Chemical technology Abdullah, Muhammad Faiq Andriyana, Andri Muhamad, Farina Ang, Bee Chin Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning
description	In this study, modified coaxial electrospinning (CE) was employed to improve electrospinnability and to tailor surface morphology and bead formation of poly(lactic acid) (PLA) fibers by means of core-to-shell flowrate ratio variation. Chloroform/N,N-dimethylformamide (DMF) mixture was used as sheath solution which serves as a protective layer to prevent rapid solidification of PLA droplet causing needle clogging. Five different core-to-shell flowrate ratios yielded beads-on-a-string PLA fibers with distinctive fiber and bead properties. These diverse morphologies were characterized in terms of fiber diameter (D-f), fiber percentage (P-f), number of beads per area (n(b)), bead area (A(b)), bead aspect ratio (L-b/D-b), ratio of bead-to-fiber diameter (D-b/D-f) and surface roughness. From thermal analysis, crystallinity of PLA fibers was shown to be significantly dependent on the fiber processing history, where higher degree of molecular chain orientation and longer jet flight time correspond to higher crystallinity values. Core-to-shell flowrate ratio of 1:3 resulted in PLA fibers with the least nb, smallest D-b/D-f and highest L-b/D-b (spindle-like shape), which correspond to the highest tensile properties and minimum hydrophobicity among beads-on-a-string fibers studied, as indicated by effective stress-strain curve and water contact angle measurement. Furthermore, the results suggested that D-b/D-f was the dominant factor affecting tensile properties more than the effect of crystallinity, while L-b/D-b (bead shape) was the key aspect which influenced the wettability of the PLA beads-on-a-string fibers.
format	Article
author	Abdullah, Muhammad Faiq Andriyana, Andri Muhamad, Farina Ang, Bee Chin
author_facet	Abdullah, Muhammad Faiq Andriyana, Andri Muhamad, Farina Ang, Bee Chin
author_sort	Abdullah, Muhammad Faiq
title	Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning
title_short	Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning
title_full	Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning
title_fullStr	Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning
title_full_unstemmed	Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning
title_sort	effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning
publisher	Elsevier
publishDate	2021
url	http://eprints.um.edu.my/26407/
_version_	1735409408653918208
score	13.211869

Effect of core-to-shell flowrate ratio on morphology, crystallinity, mechanical properties and wettability of poly(lactic acid) fibers prepared via modified coaxial electrospinning

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