Grace Anak Singan (2018) Starch-based bioplastic, Graft copolymerization, Biodegradable plastic, Water absorbency, Potato starch. Masters thesis, Universiti Malaysia Sabah.
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Abstract
Starch-based bioplastic have been known as an alternative material to substitute the usage of petroleum-based plastic. The usage of starch-based bioplastic nowadays keep on growing as it is nature friendly, biodegrade faster, and consume less pollution if compared to traditional petroleum-based plastic. However, an issues of its absorbency arise when it faces incompatibility in certain application. This study concentrates on water absorbency properties and characteristics of starch-based bioplastic by employing chemical modification onto potato, cassava and corn starch using graft copolymerization method with potassium persulfate to act as the initiator. It was found that 0.8% of grafted starch obtained is the highest graft percentage for all types of starch. Graft copolymerization of starch is not affected much despite its increasing amount of moisture absorption rate due to concentration of initiator, synthesis temperature and surrounding humidity. For the production of bioplastic, both the native and grafted starches are applied to compare the water absorbency properties with the ratio of native starch to grafted starch are 5100:MS0, 570:MS30, 550:MSS0, 530:MS70 and S0:MS100. It was demonstrated that absorbency rate of potato starch bioplastic and cassava starch bioplastic increased with the increase of grafted starch ratio, meanwhile corn starch bioplastic showed no improvement. It can be concluded that more amount of grafted starch added onto bioplastic has increase its hydrophilicity properties. Corn starch bioplastic on the other hand, is not affected by the increasing amount of absorbency rate because of its low density value and is very brittle. The tensile test proved that corn starch bioplastic got weaker tensile strength with the increasing amount of grafted starch used. Meanwhile, both potato starch bioplastic and cassava starch bioplastic have higher tensile strength value at 0.2% grafted starch used but declines with increasing amount of grafted starch which suggests that the hydrophilicity properties has weaken the mechanical strength of bioplastic.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | Starch-based bioplastic, Graft copolymerization, Biodegradable plastic, Water absorbency, Potato starch |
| Subjects: | T Technology > TP Chemical technology > TP1-1185 Chemical technology > TP200-248 Chemicals: Manufacture, use, etc. |
| Department: | FACULTY > Faculty of Science and Natural Resources |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 24 Jun 2025 15:07 |
| Last Modified: | 24 Jun 2025 15:07 |
| URI: | https://eprints.ums.edu.my/id/eprint/44250 |
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