Surface characterization of vulcanized rubber treated with sulfuric acid and its adhesion to polyurethane adhesive

被引:47
作者
Cepeda-Jiménez, CM [1 ]
Pastor-Blas, MM [1 ]
Ferrández-Gómez, TP [1 ]
Martín-Martínez, JM [1 ]
机构
[1] Univ Alicante, Dept Inorgan Chem, Adhes & Adhes Lab, E-03080 Alicante, Spain
关键词
SBR rubber; surface treatment; sulfuric acid; contact angle; ATR-IR spectroscopy; SEM; T-peel strength;
D O I
10.1080/00218460008029303
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Modifications produced on a vulcanized styrene-butadiene rubber surface by treatment with sulfuric acid were studied and several experimental variables were considered. The treatment of R1 rubber with sulfuric acid produced a noticeable decrease in contact angle which was mainly ascribed to an increase in surface energy due to the formation of sulfonic acid moieties and C=O bonds, and the removal of zinc stearate. The rubber surface swelled and became brittle as a result of the treatment, and when flexed microcracks were created. A rubber surface layer modification was produced with a consequent decrease in tensile strength and elongation-at-break values. The treatment enhanced the T-peel strength of R1 rubber/polyurethane adhesive joints and the locus of failure was cohesive in the rubber. The optimum immersion time in H2SO4 solution was less than 1 min., and the reaction time in air was not found to be critical; the neutralization with ammonium hydroxide and the high concentration of the sulfuric acid (95 wt%) were essential to produce adequate effectiveness of the treatment.
引用
收藏
页码:135 / 160
页数:26
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