In Figure 6 (A), the SPEEK ionomer given for FT-IR analysis showed characteristic sulphonic acid
group peak at 1124, 1018 [cm.sup.-1].
Synthesis--Acrylic acid-4-amino benzene sulphonic acid
(AA-co-4ABSA) copolymer of low molecular weight was synthesized in aqueous medium through free radical polymerization by using an initiator.
The buffer was prepared 0.025 M dibasic potassium phosphate and 0.005 M hexane sulphonic acid
sodium salt in 1000 ml water, adjust the pH with phosphoric acid to 3.0 [+ or -] 0.1 .The flow rate of mobile phase was 1.0 ml/min.
ease of use, cheaper than methane sulphonic acid
based chemistry, reduced over-etching and established history of use.
For example, he would be uncertain whether that protection reached the use of any sulphonic acid
in the manufacturing process as well as the methanesulfonic acid (MSA) specified in claim 1 of the Patent.
The mechanism underlying the hypolipidemic affect of perfluorooctanoic acid (PFOA), perfluorooctane sulphonic acid
(PFOSA) and clofibric acid.
However, the activities of the two companies overlap only on a few products, namely LAB sulphonic acid
(LAS, a surfactant); linear fatty acids; ethoxylates (produced, inter alia, from linear fatty acids); and isopropyl alcohol.
During the year 1991 the company established a wholly owned subsidiary Lever Chemicals to manufacture sulphonic acid
at Rahimyar Khan.
There is considerable decrease in the band intensity at 1666 and 1652 [cm.sup.-1] of N-(C=S)- for DTOF and SDTOF resins, respectively, after [Ni.sup.2+] ion loading which give possibility of forming surface complex in which a lone pair of electrons from the N and S atoms were shared with the nickel ions and the noticed shift in the bands at 1298, 3423, and 2800 [cm.sup.-1], for C-N stretching of Ar-[NH.sub.2], stretching vibrations of secondary amine and OH of sulphonic acid
group, respectively, indicates that adsorption at primary, secondary amine nitrogen and sulphonic acid
group follows ion exchange mechanism.
Several studies have been done in order to improve the solubility of polyaniline; among them is using functionalized protonic acids as dopant, like p-toluenesulphonic acid, octyl-benzene-sulphonic acid, dodecyl benzene-sulphonic acid , poly(styrene) sulphonic acid
, and phosphoric acid esters .
Potassium iodide, sodium thiosulfate, starch, ethanol, potassium hydroxide, and phenolphthalein were purchased from Merck (Germany) and 2,4-dinitrobenzene sulphonic acid
(DNBS) from ICN Biomedicals.