Vinyl Ester Resin Structure

Polives resins special chemical backbone with hydroxyl functionality at the end of chain offers very good wetting of glassfibers carbon and aramide fibers.

Vinyl ester resin structure.

While vinyl ester resins are classified as polyester based formulations they are actually an intermediate between a polyester backbone and epoxy terminations on the ends of the molecules. As the length of the chain is available to absorb impact loads this makes vinyl ester resins more durable and resilient than polyesters. Chemical structure of the vinyl ester resin monomer. Derakane 510n resin is brominated epoxy novolac vinyl ester resin that offers a moderate degree of fire retardance1.

Vinyl ester resin or often just vinyl ester is a resin produced by the esterification of an epoxy resin with acrylic or methacrylic acids. It is also useful in hot wet fluegas environments where. Vinyl esters also use peroxides e g. The molecular structure of vinyl ester resins is similar to that of polyesters but differs primarily on the location of their reactive groups which are positioned only at the ends of the chains.

The special chemical backbone of vinly ester resins prevent hydrolysis of ester groups. Vinyl ester resins are produced by the reaction esterification between an epoxy resin and an unsaturated monocarboxylic acid. Vinyl ester is dissolved in a monomer or reactive diluent usually styrene the result is a low viscosity liquid having a solids content of 36 39. Essentially they comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain.

Unsaturation at the end of the structure provides for a full cure to obtain optimum properties. With the reduced number of ester groups in a vinylester when compared to a polyester the resin is less prone to damage by hydrolysis. The diester product is then dissolved in a reactive solvent such as styrene to approximately 35 45 percent content by weight. More fatigue resistant than standard epoxy vinyl ester resins.

Vinyl ester monomer contains two vinyl end groups that allow cross linked structure to form during the reaction. It exhibits a corrosion resistance similar to derakane 470 resins in most environments. Vinyl ester resins are relative viscous low molecular weight prepolymers. The vinyl groups refer to these ester substituents which are prone to polymerize.

The material is therefore sometimes used as a barrier or skin coat for a polyester laminate that is to be immersed in water such as in a boat hull.