Effect of Redox Initiator Concentration on Grafting Parameters andAdhesion Strength of Persian Gum-g-Polyvinyl Acetate Wood Adhesives

Persian gum (PG) is a polysaccharide, native to Iran, the capability of which has been recentlydemonstrated to adhere to wood substrates. However, like other polysaccharides, its modification isessential to enable it to effectively compete with the synthetic polymers that replace them. For thispurpose, in this study, vinyl acetate (VAc) was grafted onto the PG chains using a redox initiatorsystem at concentraions of ۰.۰۰۵ and ۰.۰۱ mol/L. The results of FTIR spectroscopy on PG and PGbasedwood adhesive after removing PVAc homopolymers using the Soxhlet extraction methodconfirmed the successful grafting of monomers onto PG. The result of grafting parameters showedthat by halving the redox initiator concentration, the grafting percentage (G) increased from ۳۶ to۵۵% and the grafting efficiency (GE) enhanced by ۲۹% to more than ۸۲%. In addition, the woodadhesive synthesized with a ۰.۰۰۵ mol/L initiator concentration showed greater adhesion strengthand suitable long-term storage stability.

کلیدواژه ها:

Adhesives ، Persian Gum ، Redox System ، Grafting Parameter ، Adhesion Strength.