Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral - Tesis

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Browsing Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral - Tesis by Author "Din, Siti Nor"

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    Preparation, characterization and properties of plasticized polyvinyl chloride with tailorable hydrophobicity for coating applications
    (2022-05-01)
    Din, Siti Nor
    Superhydrophobic surfaces are propitious for coating applications to safeguard numerous substrates from harsh settings. The process of forming superhydrophobic surfaces significantly relies on the creation of rough surfaces using low-surface energy constituents. This study concentrated on the production of a plasticised polyvinyl chloride (pPVC)-based coating material to achieve a superhydrophobic attribute. In this study, diisononyl phthalate (DINP) was used to plasticise polyvinyl chloride (PVC), which would be further fused in the oven at various temperatures, ranging from 170 to 190°C for 8 to 14 minutes. The pPVC fused at 190°C for 12 minutes formed a homogeneous structure due to a higher degree of absorption of the plasticiser with a remarkable increase in tensile properties. By using a simple method of incorporating calcium carbonate particles (c-GCC) coated with stearic acid, superhydrophobic pPVC was produced. The pPVC surfaces’ superhydrophobicity attribute is increased by combining the microstructured surface roughness and low surface energy. The outcome showed that the extent of roughness is intensified with the highest contact angle at 167° after the c-GCC fillers are increased. On the other hand, the increase in filler loading increases the thermal stability, yet decreases the tensile strength and the plasticiser leaching property. However, coating materials are normally composed of many additives for the purpose of enhancing the inherent properties of the resin used. Therefore, further evaluation was made on the effect of low aromatic white spirit (LAWS) solvent and nanosized modified fumed silica (MFS) filler to the properties of the previously prepared filler pPVC compound. It was found that the addition of solvent and nanosized filler caused the compound to lose their superhydrophobic property to 148°. The presence of solvent had gradually decreased the surface energy, tensile strength, and the amount of plasticiser leaching out from the samples. In contrast, the MFS filler allowed for the intensification of surface energy, tensile strength and thermal stability. Besides, MFS filler allow for the augmentation of surface roughness with an increase in plasticiser leaching property. In conclusion, CFS3 which consists of 100 phr c-GCC filler, 20 phr solvent and 1 phr MFS filler is the most suitable formulation to be used for coating applications.