Development of compression molded durian skin fiber-reinforced biocomposite /
Durian skin fiber (DSF) filled plasticized poly(lactic acid) (PLA) composites was prepared and examined stage by stage in this study. Firstly, DSF was identified for its physical, thermal and morphological properties. DSF then, was treated with sodium hydroxide (NaOH). Secondly, PLA was compounded w...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
Kuala Lumpur :
Kulliyyah of Engineering, International Islamic University Malaysia,
2015
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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: | Durian skin fiber (DSF) filled plasticized poly(lactic acid) (PLA) composites was prepared and examined stage by stage in this study. Firstly, DSF was identified for its physical, thermal and morphological properties. DSF then, was treated with sodium hydroxide (NaOH). Secondly, PLA was compounded with 10 to 40 wt% untreated DSF (uDSF) and treated DSF (tDSF) via twin screw extruder and injection molded into test specimens. DSF loading with 30 wt% was chosen for further investigated under ultraviolet (UV) irradiation to study the biocomposites degradation characterization as it showed the best impact strength and elongation at break. The average diameter and length of DSF is 298.54 µm and 1.48 mm respectively, with average aspect ratio (L/D) is 5.53. As compared with TDSF, the aspect ratio for TDSF is higher because of the reduction in the diameter due to the removal of the hemicelluloses and other impurities. At 30wt% tDSF loading, tensile strength improved by 25%, while flexural strength improved by almost 30% compared to uDSF at same fiber loading. Improvement in properties suggests effective stress transfer between fiber and matrix. Morphological studies leads to assumption that uDSF composites present very poor dispersion of the fibers which also exhibited fiber breakage and poor adhesion. DSC results show that the NaOH treated composites had a slight shift in the melting temperature due to reduced chain mobility. The melting enthalpy values were too scattered to make definite conclusions on changes in the crystallinities for the 30% DSF composites. The TGA results showed improved thermal stability for the NaOH treated composite compared untreated biocomposites. Storage and loss modulus of DSF-PLA composites increased with increasing DSF loading. This is due to stiffness of DSF fiber that restricts the mobility of polymer chains. Tan delta decreased with increasing DSF loading. The UV irradiation tests confirmed the thermal degradation of the systems, suggesting enhanced degradation with the presence of DSF. |
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| Physical Description: | xv, 113 leaves : ill. ; 30cm. |
| Bibliography: | Includes bibliographical references (leaves |