TY  - JOUR
T1  - Production and Characterization of Castor Oil-Modified Alkyd Resins
AU - , O.D. Onukwli AU - , P.K. Igbokwe 
JO  - Journal of Engineering and Applied Sciences
VL  - 3
IS  - 2
SP  - 161
EP  - 165
PY  - 2008
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2008.161.165
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2008.161.165
KW  - Alkyds
KW  -saponification
KW  -polymerization
KW  -castor oil
KW  -resin
AB  - The reaction of the polyesterification of glycerol, phtalic anhydride and dehydrated castor oil leading to the  formation  of  alkyd resins was studied. Alkyd resins of 40% (I), 50% (II), 60% (III), 40% (IV), 50% (V), 60% (VI), 40% (VII), 50% (VIII) and 60% (IX) were prepared with three different catalysts-lead (II) oxide, lithium hydroxide and calcium carbonate. The extent of reaction (PA) and average degree of polymerization (DP) were determined  from  end-group  analysis  of aliquots of the reaction mixture at various time intervals. Results on the degree of polymerization indicated formation of appreciably high molecular weight resins, soluble in xylene (3:2 dilution), with qualities varying with oil length. The untreated and dehydrated castor oil had acid and saponification values of 2.89 and 182.0 and 5.9 and 189.40, respectively. The variation of drying time with the catalyst used showed that the shorter alkyd resins (40%) dried faster than the medium (50%) and long alkyds (60%). In addition, the reaction completion time for the 40% oil alkyds was shorter than for medium and long alkyds.
ER  -