Ataei, S. and Yahya, Rosiyah and Gan, S.N. (2011) Palm oleic acid based alkyds: effect of the fatty acid content on the polyesterification kinetics. Journal of Polymers and the Environment, 19 (2). pp. 540-545. ISSN 1566-2543, DOI https://doi.org/10.1007/s10924-011-0303-7.
Full text not available from this repository.Abstract
The kinetic behavior of polyesterification of the alkyd resins synthesized using glycerol and phthalic anhydride modified with oleic acid from the palm oil at temperatures between 120 and 240 °C was studied. Three alkyds having oleic acid contents of 28, 40, and 65 were prepared by employing fatty acid method. The extent of the polyesterification reaction and average degree of polymerization were monitored by determining the acid number of the aliquot of the reaction mixture at various intervals of time and by measuring the volume of water evolved. Kinetic studies revealed that initial reaction rates followed a second-order kinetics up to certain limit and thereafter deviations were observed. The extent of reaction varied from 77.4 to 86.3 before deviation for all the three samples and exhibited a considerable degree of conversion. The second-order rate constants calculated from the linear part were found to be of the order of 10 -5 g (mg KOH) -1 min -1. Molecular weight of the alkyd samples was determined by GPC; number average molecular weight of the alkyds ranged from 980 to 2,070.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Extent of reaction Kinetic studies Molecular weight Palm oleic acid Polyesterification Acid content Acid numbers Average degree Degree of conversion Kinetic behavior Kinetic study Number average molecular weight Palm oil Phthalic anhydrides Polyesterification reaction Reaction mixture Second order kinetics Second-order rate constants Alkyd resins Esters Glycerol Kinetic theory Oleic acid Rate constants Reaction kinetics Resins Unsaturated fatty acids Vegetable oils Kinetics ester fatty acid molecular analysis organic acid polymerization temperature effect |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Science > Department of Chemistry |
| Depositing User: | miss munirah saadom |
| Date Deposited: | 05 Jul 2013 07:21 |
| Last Modified: | 23 Jan 2020 00:38 |
| URI: | http://eprints.um.edu.my/id/eprint/6738 |
Actions (login required)
 |
View Item |
