Development of conductive polymer composites from polylactic acid/ thermo plastic polyurethane blends filled with graphene nanoplatelets /
Poly(lactic acid) (PLA) owns some good properties such as biocompatibility, biodegradability and high strength however its brittleness became the drawback for this polymer to be utilised in broader fields. Thermoplastic polyurethane (TPU) has high strength and toughness with good biocompatibility wh...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
Kuala Lumpur :
Kuliyyah of Engineering, International Islamic University Malaysia,
2019
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| Subjects: | |
| Online Access: | Click here to view 1st 24 pages of the thesis. Members can view fulltext at the specified PCs in the library. |
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| Summary: | Poly(lactic acid) (PLA) owns some good properties such as biocompatibility, biodegradability and high strength however its brittleness became the drawback for this polymer to be utilised in broader fields. Thermoplastic polyurethane (TPU) has high strength and toughness with good biocompatibility which can improve the drawback owned by PLA. In this work, PLA/TPU blends were prepared by melt mixing process with the addition of graphene nanoplatelets (GnP). GnP were used as filler for PLA/TPU to tailor the electrical conductivity and mechanical properties of the composites. These properties can be affected by the dispersion state of GnP in the composite, GnP composition and PLA/TPU ratio, which are the main factors to be considered to determine the optimum composition that possess the best performance. The electrical conductivity was tested using resistance meter and showing that the resistance of the composite started to percolate in the presence of GnP and the percolation threshold change when blend composition change, by showing that at PLA90/TPU10 show the lowest percolation threshold among all ratio. The morphology and selective localization of GnP in the composite are characterized by scanning electron microscopy (SEM). The localization of GnP in PLA/TPU blend was predicted by calculation of wetting coefficient along with Owen and Wendt equation and it is predicted that GnP preferentially in TPU phase. Elongation at break of the composite increased as the TPU content increased and when GnP were added in PLA50/TPU50 blend, the elongation at break of the blend rise up significantly which lead to the conclusion that GnP did affect the mechanical properties of PLA/TPU blends. |
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| Physical Description: | xiv, 70 leaves : colour illustrations ; 30cm. |
| Bibliography: | Includes bibliographical references (leaves 65-69). |