Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
A large amount of waste cooking oil has become an environmental issue around the world. This oil is renewable and biodegradable than the corresponding products made from petroleum sources. The major concern in this study focuses on the resistance of the biopolymer to ultraviolet (UV) light exp...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1687/1/24p%20SITI%20RAHMAH%20MOHID.pdf http://eprints.uthm.edu.my/1687/2/SITI%20RAHMAH%20MOHID%20WATERMARK.pdf |
| Summary: | A large amount of waste cooking oil has become an environmental issue around the
world. This oil is renewable and biodegradable than the corresponding products
made from petroleum sources. The major concern in this study focuses on the
resistance of the biopolymer to ultraviolet (UV) light exposure. The virgin oil (VO)
and waste oil (WO) was converted into biomonomer. By adding biomonomer with
an appropriate amount of 4, 4’-methylene diphenyl diisocyanate (MDI) and solvent,
the virgin oil polymer (VOP) and waste oil polymer (WOP) were produced. The
biopolymer (BP) were added with low loading metal oxide filler which is 2.5, 5, 7.5
and 10 % of titanium dioxide (TiO2) to form biopolymer composite (BPC). The
resistance to UV light and mechanical properties of BP and BPC were determined
after exposure the thin films in UV weatherometer for an extended period of time at
250, 500, 750,1000, 2000 and 3000 hours. The results based on the spectroscopic
analysis of UV-Vis and FTIR confirmed the photodegradation processes of BP and
BPC of VOP and WOP. The increasing absorbance in UV-Vis spectra indicated the
formation of quinone after UV-irradiation of BP and BPC of VOP and WOP.
Furthermore, BP thin films shows rapid loss of tensile strength but the increased
loading of TiO2 can improve mechanical performance. Visual inspection based on
the colour changes of the thin films showed quinone (yellow) formation of the
irradiated films of BP and BPC of VOP and WOP. As a conclusion, the effect of
prolonged exposure to UV light, in general promotes photo degradation for BP but
BPC gives slower chemical modification. The innovative biopolymer composite
were successfully designed and developed by adding the TiO2 as UV stabilizer to
reduce the photo-degradation of the biopolymer. |
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