Synthesis and properties of novel poly(alkyd-urethane)s derived from various types of vegetable oils
| dc.contributor.author | Jem Shan, Ling | |
| dc.date.accessioned | 2015-05-25T06:56:39Z | |
| dc.date.available | 2015-05-25T06:56:39Z | |
| dc.date.issued | 2014 | |
| dc.description.abstract | Triglyceride of oil palm (Elaeis guineensis), soy (Glycine max) and sunflower (Helianthus annuus) were used to produce novel alkyd diols and poly(alkydurethane) s with chemical structure specifically designed for better coating performances. The vegetable oils were first converted to monoglycerides by glycerolysis process. The monoglycerides derived from the different oils were reacted with phthalic anhydride at 2:1 monoglyceride-to-phthalic anhydride ratio to obtain novel polyols called alkyd diols. The polyols were then reacted with 4,4`- methylenediphenyldiisocyanate (MDI) to produce five novel poly(alkyd-urethane)s (PAU), namely palm oil based poly(alkyd-urethane) (POPAU), soy oil based poly(alkyd-urethane) (SOPAU), sunflower oil based poly(alkyd-urethane) (SFPAU), palm-soy oils based poly(alkyd-urethane) (POSOPAU) and palm-sunflower oils based poly(alkyd-urethane) (POSFPAU). The successful synthesis of the monoglycerides, alkyd diols and poly(alkyd-urethane)s were confirmed by FTIR, 1H NMR, 13C NMR spectroscopy and their morphology were evaluated by scanning electron microscopy (SEM). The obtained varieties of poly(alkyd-urethane) were applied onto substrates to study their physical and mechanical properties. Further analyses prior to application included viscosity, solubility, iodine number testing, gel content, drying time test while thermogravimetric analysis (TGA), crosshatch adhesion tests, impact strength, pencil hardness, chemical and water resistance were employed after the films were cured. The films showed good homogeneity and impressive thermal stability with palm oil poly(alkyd-urethane) showing only 5% weight loss temperature in N2 at 270oC. Overall, sunflower oil poly(alkyd-urethane) exhibited relatively better mechanical and thermal properties among all due to the highest percentage of cross linked fraction portrayed by its higher iodine value and gel content. Coating performance of poly(alkyd-urethane) based on palm oil was enhanced after blending with sunflower oil or soy oil based alkyd-diols. The adopted technique in the novel chemical design of poly(alkyd-urethane)s created a potential alternative reaction schemes to be applied in the industry for surface coating, binder for composites and other applications, aiding the effort to replace or minimize the use of non-sustainable petroleum-based raw material. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/714 | |
| dc.language.iso | en | en_US |
| dc.title | Synthesis and properties of novel poly(alkyd-urethane)s derived from various types of vegetable oils | en_US |
| dc.type | Thesis | en_US |
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