info:eu-repo/semantics/article
Chemical modification of styrene-butadiene-styrene co-polymer by grafting of N-carbamyl maleamic acid
Fecha
2004-12Registro en:
Lassalle, Verónica Leticia; Failla, Marcelo Daniel; Valles, Enrique Marcelo; Martín Martínez, José Miguel; Chemical modification of styrene-butadiene-styrene co-polymer by grafting of N-carbamyl maleamic acid; Brill Academic Publishers; Journal of Adhesion Science and Technology; 18; 15-16; 12-2004; 1849-1860
0169-4243
CONICET Digital
CONICET
Autor
Lassalle, Verónica Leticia
Failla, Marcelo Daniel
Valles, Enrique Marcelo
Martín Martínez, José Miguel
Resumen
A styrene-butadiene-styrene (SBS) block co-polymer was functionalized using different amounts of N-carbamyl maleamic acid (NCMA) and benzoyl peroxide as initiator. NCMA, which is a bifunctional monomer, was synthesized in our laboratories. The concentration of NCMA used in the functionalization of SBS ranged from 0.5 to 3% (w/w) based on the co-polymer mass. Benzoyloxy radicals generated from the thermal decomposition of benzoyl peroxide initiated the grafting reaction. The concentration of the initiator was kept constant at 0.076% (w/w). FT-IR spectroscopy was used to determine the amount of NCMA effectively grafted onto the SBS. The maximum amount of monomer grafted was about 0.3% (w/w) when the SBS was modified with 1% (w/w) NCMA. The effect of grafting on the surface properties and the adhesion to polyurethane adhesive of the modified SBS were evaluated. Contact angle values were obtained using liquid droplets. When the concentration of the NCMA used in the grafting reaction was 1% (w/w), the contact angles with water on original and modified SBS were 95° and 77°, respectively. Adhesion properties were evaluated by standard peel tests employing a commercial polyurethane adhesive. The modified SBS having the largest amount of NCMA displayed a T-peel strength value 5-times higher than the corresponding value measured with the original SBS.