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Bio, thermal and photo degradation of polymer thin films from renewable resources

Nik Yusuf, Nik Alnur Auli (2011) Bio, thermal and photo degradation of polymer thin films from renewable resources. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

This research is focused on the resistance to bio, thermal and photo-degradation of polymer thin films from renewable resources based on virgin and waste vegetable cooking oil from Small and Medium Industries (SMIs). Vegetable and waste vegetable oil polymers were grouped as virgin oil polymer (VOP) and waste oil polymer (WOP) thm film. The thin films were prepared by adding bio-monomer with an appropriate amount of 4, 4'-methylen-bis-(phenylisocyanate) (MDI). Percentage weight loss of VOP thin film in compost soil burial test was significantly greater than those in peat soil burial test. For 200 days degradation in compost soil, weight loss for VOP and WOP were 68.32 % and 28.78%, meanwhile for peat soil burial test were 44.52% and 24.56% respectively. As the temperature and the exposure time increased, the carbonyl index (CI) via infra-red also increases for both WOP and VOP at given temperature and 600 minutes from initial value of WOP is 0.296 to 0.427, meanwhile the initial value for VOP is 0.417 to 0.44 respectively. This is due to the number of cham scissions that occur in the polymer thin films associated with the scission of the (-NHCO-0-) for both WOP and VOP. It was observed that the size of the peaks for Thermal Gravimetlic Analysis (TGA) is correlated with the amount of hard and soft segment at 325°C and 431°C respectively. The ductility disappears and the strength and strain at rupture strongly decrease at over 35% upon equatorial exposure. The active participant of OH group with isocyanate was lead to the creation of more stress point, thus, lower energy needed for WOP thin films to bring to failure. As a conclusion, WOP h n films were resistance to bio and thermal degradation with the lowest value of weight loss and CI. However, WOP thin films were affected by photo-degradation where the occurrence of surface damage, which in turn enhances the degradation of these mechanical parameters.

Item Type: Thesis (Masters)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Depositing User: Normajihan Abd. Rahman
Date Deposited: 23 Apr 2012 00:42
Last Modified: 23 Apr 2012 00:42
URI: http://eprints.uthm.edu.my/id/eprint/2424
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