Preparation of sulfonic acid-containing rubbers from natural rubber vulcanizates

Worapong Poonsawat; Sirilux Poompradub; Chawalit Ngamcharussrivichai

doi:10.1117/12.2054228

2 June 2014 Preparation of sulfonic acid-containing rubbers from natural rubber vulcanizates

Worapong Poonsawat, Sirilux Poompradub, Chawalit Ngamcharussrivichai

Proceedings Volume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics; 92340Q (2014) https://doi.org/10.1117/12.2054228
Event: International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, 2013, Bangkok, Thailand

Abstract

In this work, a series of sulfonic acid-containing rubbers were prepared by aqueous phase oxidation of natural rubber vulcanizates in the presence of hydrogen peroxide (H₂O₂) and formic acid (HCOOH). The starting vulcanizates were neatly prepared via an efficient vulcanization (EV) system by varying mass ratio of N-cyclohexyl-2-benzothiazole sulfonamide (CBS), as an accelerator, to sulfur. The oxidation conditions were controlled at the molar ratio of H₂O₂: HCOOH = 1:1, the concentration of H₂O₂ = 15 wt.%, the temperature = 50 °C, and the reaction time = 3 h. The rubber materials before and after the oxidation were characterized for their physicochemical properties by using Fourier transform infrared spectroscopy, bomb calorimetry, acid-base titration and swelling measurements. The results indicated the presence of sulfonic acid group in the oxidized rubbers, generated by the oxidative cleaves of sulfide crosslinks in the rubber vulcanizates. The oxidation decreased the sulfur content of the rubber in which the level of sulfur loss was determined by the CBS/sulfur ratio. Moreover, the acidity of the oxidized products was correlated with the amount of sulfur remaining.

Citation Download Citation

Worapong Poonsawat, Sirilux Poompradub, and Chawalit Ngamcharussrivichai "Preparation of sulfonic acid-containing rubbers from natural rubber vulcanizates", Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 92340Q (2 June 2014); https://doi.org/10.1117/12.2054228

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