NORHIWANI MOHD HAPIPI, NORHIWANI (2021) FIELD-DEPENDENT VISCOELASTIC PROPERTIES OF POLYVINYL ALCOHOL BASED MAGNETORHEOLOGICAL PLASTOMER WITH DIFFERENT SOLVENTS. Doctoral thesis, Universiti Teknologi Malaysia.
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Abstract
Polyvinyl alcohol (PVA)-based Magnetorheological Plastomer (MRP) is one type of smart material that consists of carbonyl iron particles (CIPs) embedded within a polymer network swollen by a large amount of water like PVA. PVA-based MRP has controllable rheological properties upon the application of an external magnetic field. However, the existing PVA-based MRP possesses desiccation and oxidation of CIPs, leading to the degradation of materials. Consequently, these problems limit the efficiency and usability of PVA-based MRP for long time operations. Therefore, this research aims to obtain a new PVA-based MRP with less oxidation and desiccation problems by studying the suitability of other solvents during the fabrication process. PVA solution was prepared using three different mixtures of solvent; water, dimethyl sulfoxide (DMSO) and binary mixture (water: DMSO) with various CIPs loading of 50, 60 and 70 wt.%. All samples were chemically crosslinked, and PVA-based MRP samples were experimentally evaluated for different physicochemical properties. Rheological properties of the PVA-based MRP were conducted using a rheometer based on strain amplitude, frequency, and magnetic field sweeps. The effect of different ratios of binary mixtures toward the shear thickening (ST) effect and magnetorheological (MR) effect has been examined. The experimental results showed that the rheological properties of MRP were highly dependent on the solvent type, solvent composition, and CIPs loading. PVA-based MRP with binary mixtures of DMSO: water (80:20) displayed good stability, no oxidation and desiccation with MR effect up to 11,024% compared to DMSO with 7,049%. Furthermore, water solvent has shown a sign of corrosion after a month and desiccation after 24 hours. Nevertheless, all PVA-based MRP exhibited controllable properties due to dramatic changes in their rheological properties under various external magnetic fields. A sample with a ratio of 20:80 (water: DMSO) has shown the highest ST and MR effect with the fastest response when exposed to the excitation magnetic field. Consequently, PVA-based MRP has the potential to be used as body protection such as soft armor, dampers, shock absorption and ballistic protection.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Subjects: | Technology > Technology (General) Technology > Chemical technology |
| Depositing User: | ENCIK SAIFUL FADZLY JAMALUDIN |
| Date Deposited: | 17 Sep 2026 17:29 |
| Last Modified: | 17 Sep 2026 17:29 |
| URI: | https://repositori.mohe.gov.my/id/eprint/433 |
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