Mr. Worapong Poonsawat Profile

Worapong Poonsawat

at Chulalongkorn Univ

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Proceedings Article | 2 June 2014 Paper

Preparation of sulfonic acid-containing rubbers from natural rubber vulcanizates

Worapong Poonsawat, Sirilux Poompradub, Chawalit Ngamcharussrivichai

Proceedings Volume 9234, 92340Q (2014) https://doi.org/10.1117/12.2054228

KEYWORDS: Sulfur, FT-IR spectroscopy, Polymers, Hydrogen, Zinc oxide, Infrared spectroscopy, Calorimetry, Spectroscopy, Experimental mechanics, Oxidation

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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.

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