Alkoxysilane-functionalized styrenated oil based polyester hybrid films were prepared by using vinyl trimethoxysilane (VTMS) as an inorganic source. For this purpose, an oil based polyester (PGMA) was first synthesized by the esterification of partial glyceride (PG) mixture with maleic anhydride (MA). Then, PGMA was further reacted with both styrene (St) and the mixture of St and VTMS yielding St-PGMA and St-PGMA-VTMS samples, respectively. The synthesis was carried out by changing VTMS content in the range of 5-15 wt.% in order to investigate the effect of inorganic domains on the film properties. While the films of St-PGMA-VTMS were formed on the appropriate substrates by moisture curing and oxidative polymerization, St-PGMA films were only cured by oxidative polymerization. The characterization of the polymers was done by FTIR, (1)H NMR, DSC, TGA and SEM. FTIR and DSC analyses indicated the completion of the moisture curing process. Film properties such as flexibility, adhesion, water, alkali and acid resistances were determined. All samples showed good film properties. Moreover, in comparison, St-PGMA-VTMS samples exhibited better alkali resistance than St-PGMA due to the contribution of the inorganic domains. (C) 2011 Elsevier B.V. All rights reserved.