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https://ptsldigital.ukm.my/jspui/handle/123456789/475891| Title: | Hardness and abrasion resistance of poly(ethylene terephthalate) films without and with hard and adhesive coatings |
| Authors: | Low Zi Jia (P103418) |
| Supervisor: | Chia Chin Hua, Prof. Dr. |
| Keywords: | Polyethylene terephthalate Phthalate esters Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia |
| Issue Date: | 13-Oct-2021 |
| Description: | The increasing usage of poly(ethylene terephthalate) (PET) film in tribological application prompting the effort to improve its scratch/wear performance. Optically transparent biaxially oriented PET film is often used as a screen protector or flexible cover window for foldable display devices when coated with a layer of optically clear pressure-sensitive adhesive (OCA) underneath for adherence and a hard coating (HC) on top for protection against tribological damages by enhanced surface hardness. The overall properties of this multilayered film structure (HC/PET/OCA) are depending on the properties of each layer. This study provides an insight into the effect of PET and OCA thickness, the presence of soft OCA underlayer and/or HC on the overall tribological performance of the film system. The PET films in varying thickness without and with HC and/or different thickness of OCA coating were investigated quantitatively in terms of stress-strain, adhesion, pencil hardness, eraser abrasion resistance, and steel wool abrasion resistance. Results collectively show that the PET films have reasonably good mechanical properties while revealing a tough and ductile plastic nature. Nonetheless, they show poor performance in pencil hardness, scratch resistance and abrasion resistance due to inadequate Young’s modulus, yield stress and tensile strength. This is resolved by only a thin layer of industrially prepared HC (3 μm) made up of ultraviolet (UV) curable acrylic resin (HC-a) or its hybrid with inorganic nanoparticles (HC-b). In addition, similar enhancement can also be achieved by a self-prepared HC (5 μm) made up of UV curable di(trimethylolpropane) tetraacrylate (HC-c). The acrylic-based OCA provides high adhesion function to the PET film. Their existence caused no remarkable degradation in mechanical strength, steel wool, and eraser abrasion performance, but greatly reduced pencil hardness of the PET film with and without HC. Therefore, it is suggested to use OCA with minimum thickness until retaining the excellent adhesion performance. The hard coated PET/OCA film could withstand up to great number of abrasion cycles without surface whitening. The results collectively proved that the PET film coated with OCA and HC; either HC-a, HC-b or HC-c in this study are suitable to be applied as flexible cover window (FCW) for the foldable smartphones and optoelectronic display devices.,Sarjana Sains |
| Pages: | 94 |
| Call Number: | TP1180.T5L639 2021 tesis |
| Publisher: | UKM, Bangi |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Hardness and abrasion resistance of poly (ethylene terephthalate) films without and with hard and adhesive coatings.pdf Restricted Access | Partial | 1.2 MB | Adobe PDF |  View/Open |
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