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About this Digital Document
Polylactic acid (PLA) is perhaps one of the best known polymers produced from renewable raw materials such as sugar cane and corn starch. Several studies have focused on improving the properties of PLA by incorporating nanofillers in polymer matrix. Cellulose nanocrystals (CNC) is a nanofiller from natural sources (typically wood pulp) that is used to reinforce and modify the mechanical properties and biodegradability of PLA. In this work, cellulose nanocrystals (CNC) reinforced polylactic acid composite was produced in 1, 2, 5 and 10 wt % CNC content by a single-screw extruder in filament form. The effect of cellulose content on the thermal properties of the bio-composite were studied. Differential scanning calorimetry results showed shift in the glass transition temperature and a change in the melting temperatures, where 10% CNC content showed highest reduction in melting temperature. Cellulose proved to increase the crystallinity of the matrix compared to the neat PLA, 1% cellulose exhibited the highest cold crystallization peak. Precision filament (1.75 mm in diameter) was made for fused deposition modeling (3D printing) in order to study the mechanical properties of the bio-composites. The tensile modulus increased in 1% cellulose composites (4.55 GPa) compared to neat PLA (3.03 GPa) for the printed samples. However, the elongation at break reduced when comparing neat PLA (8.7%) while in 1% cellulose was (2.9%).
Full Title
Processing of Bio-Polymer Based Nanocomposite for Fused Filament Fabrication
Member of
Contributor(s)
Creator: Khayat, Osama Mohammad
Thesis advisor: Pearson, Raymond A.
Publisher
Lehigh University
Date Issued
2018-05
Language
English
Type
Genre
Form
electronic documents
Department name
Polymer Science and Engineering
Digital Format
electronic documents
Media type
Creator role
Graduate Student
Subject (LCSH)
Citation
@mastersthesis{khayat2018,
title = {Processing of Bio-Polymer Based Nanocomposite for Fused Filament Fabrication},
author = {Khayat, Osama},
year = {2018},
month = may,
publisher = {Lehigh University},
keywords = {3D printer, bio-polymer, cellulose, Extrusion, nanocomposite, Polylactic acid},
abstract = {Polylactic acid (PLA) is perhaps one of the best known polymers produced from renewable raw materials such as sugar cane and corn starch. Several studies have focused on improving the properties of PLA by incorporating nanofillers in polymer matrix. Cellulose nanocrystals (CNC) is a nanofiller from natural sources (typically wood pulp) that is used to reinforce and modify the mechanical properties and biodegradability of PLA. In this work, cellulose nanocrystals (CNC) reinforced polylactic acid composite was produced in 1, 2, 5 and 10 wt \% CNC content by a single-screw extruder in filament form. The effect of cellulose content on the thermal properties of the bio-composite were studied. Differential scanning calorimetry results showed shift in the glass transition temperature and a change in the melting temperatures, where 10\% CNC content showed highest reduction in melting temperature. Cellulose proved to increase the crystallinity of the matrix compared to the neat PLA, 1\% cellulose exhibited the highest cold crystallization peak. Precision filament (1.75 mm in diameter) was made for fused deposition modeling (3D printing) in order to study the mechanical properties of the bio-composites. The tensile modulus increased in 1\% cellulose composites (4.55 GPa) compared to neat PLA (3.03 GPa) for the printed samples. However, the elongation at break reduced when comparing neat PLA (8.7\%) while in 1\% cellulose was (2.9\%).},
language = {English},
}