EFFECT OF SURFACE MODIFICATION ON TENSILE PROPERTIES OF SANSEVIERIA TRIFASCIATA FIBER-REINFORCED POLYLACTIC ACID (PLA) COMPOSITE FILAMENTS
The criteria for bone implant materials include biodegradability, biocompatibility, mechanical properties close to bone, and cost-effective with customizable processing. One material that meets these criteria is Polylactic Acid (PLA) reinforced with natural fibers using Fused Deposition Modeli...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/77928 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The criteria for bone implant materials include biodegradability, biocompatibility,
mechanical properties close to bone, and cost-effective with customizable processing. One
material that meets these criteria is Polylactic Acid (PLA) reinforced with natural fibers using
Fused Deposition Modeling (FDM) method. Sansevieria trifasciata natural fibers can be used
due to their high tensile properties and availability in Indonesia. However, their strength is
lower than pure PLA due to poor interfacial bonding. Other research has achieved surface
modification of the fibers to enhance the interface. Therefore, this study aims to investigate
the effects of Sansevieria fiber surface modification on its tensile properties.
Sansevieria fiber surfaces were modified by alkali, bleaching, and ultrasonication,
followed by extrusion with PLA. Lignocellulosic content tested using Chesson-Datta.
Surface morphology of fibers, fiber diameter, and filament fractures observed using scanning
electron microscope. Fiber density was determined through density testing. Fiber and
filament tensile properties obtained from tensile tests. Filament morphology observed using
an optical microscope. Filament viscosity determined through melt flow rate testing while
filament functional groups characterized using Fourier-transform infrared spectroscopy.
PLA/Sansevieria fiber composite filaments were successfully produced through
extrusion process. Various modifications of Sansevieria fibers, including alkali, combination
of alkali and bleaching, and combination of alkali, bleaching, and ultrasonication increased
cellulose percentage. Combination of alkali treatment, bleaching, and ultrasonication on
PLA/Sansevieria fiber composite filaments with a 1.5% fiber volume fraction increased
stiffness by 30% compared to pure PLA filaments. However, their strength still remains
lower than pure PLA due to suboptimal fiber adhesion, fiber cutting, and interfacial bonding. |
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