• Anderson, Ross
• Mcintosh, Charles
• Lomax, Terry
• Russell, Gregory
• Grigsby, Warren
• Ferguson, Chris
• Franich, Robert

Abstract

Warren Grigsby,Chris Ferguson,Robert Franich and Greg Russell 2005),Evaluation of Latex Adhesives Containing Hydrophobic Cores and Poly(vinyl acetate)Shells:Potential to Improve Poly(Vinyl Acetate)Performance". International Journal of Adhesion and Adhesives 25:127-137 Various experimental poly(vinyl acetate)(PVAc)latices containing non-deformable polystyrene(PS)domains were investigated to evaluate whether the presence of PS domains improve the creep resistance performance of PVAc adhesives. A range of PS contents,PS/PVAc core-shell morphology and techniques for second-stage styrene polymerisation in PVAc particles were examined by evaluating thin-film mechanical properties and adhesive performance. Results suggest up to 50%of PS(by mass)could be incorporated into a PVAc latex without comprising adhesive strength. Mechanical testing of films indicated the presence of PS maintains film performance at elevated temperature(60C)and that polymers formed using a chain transfer agent during second stage polymerisation,and having concentric core-shell morphology,performed better than either an acorn morphology or a simple blend of PS and PVAc. Incorporation of PS domains into a commercial PVAc adhesive by second-stage polymerisation of styrene does not greatly diminish the performance of the modified adhesive. While performance advantages of adding PS into PVAc particles were realised during creep testing at elevated temperature(71C)and high humidity,the presence of PS however,did not impart any resistance to water or heat as determined by accelerated exposure water soak testing and shear block testing above 70C.

Topics

• morphology
• polymer
• strength
• creep