Vinyl Ester Molecular Structure

Ethylene is now the preferred feedstock for vam vinyl acetate monomer largely replacing the earlier acetylene based process.

Vinyl ester molecular structure.

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. Vinyl ester has fewer open sites in its molecular chain. An ester of vinyl alcohol. Vinyl esters have enhanced mechanical properties compared to polyesters with physical strength better impact and thermal shock resistance.

Vinyl ester refers to esters formerly derived from vinyl alcohol. Vinyl alcohol containing polymers are prepared by hydrolysis of the corresponding vinyl acetate polymers. Chemical structure of the vinyl ester resin monomer. 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.

The most widely used member of the category is vinyl acetate. 2 acetoxy benzoic acid vinyl ester. 2 acetoxybenzoic acid vinyl ester. Vam is usually produced by the catalysed vapour phase reaction of acetic acid with ethylene and oxygen in a fixed bed tubular reactor using a supported noble metal catalyst.

Commercially important examples of these monomers are vinyl acetate vinyl propionate and vinyl laurate. Vinyl acetate is a commercially important monomer that is classified as a vinyl ester i e. Vinyl esters undergo homopolymerization via a radical mechanism. Vinyl esters shrink less on curing which means that pre release of a laminate from a mold is less significant.

As the length of the chain is available to absorb impact loads this makes vinyl ester resins more durable and resilient than polyesters. Vinyl esters are more tolerant of stretching than polyesters. Vinyl ester monomer contains two vinyl end groups that allow cross linked structure to form during the reaction. Vinyl ester or vinylester is a resin produced by the esterification of epoxy resin with unsaturated monocarboxylic acid.