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Int. J. Mol. Sci., Volume 4, Issue 11 (November 2003), Pages 562-585

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Research

Open AccessArticle Aggregation of Non Ionic Surfactant Igepal in Aqueous Solution: Fluorescence and Light Scattering Studies
Int. J. Mol. Sci. 2003, 4(11), 562-571; doi:10.3390/i4110562
Received: 5 June 2003 / Accepted: 14 October 2003 / Published: 25 October 2003
Cited by 22 | PDF Full-text (196 KB) | HTML Full-text | XML Full-text
Abstract
The association of the polyoxyethylene nonyl phenol (Igepal) in aqueous solution has been studied. The results of the fluorescence quenching of 1-Anthracene sulphonate and Safranine T in nonionic micellar solution of Igepal have been presented. The quenching process was exploited to estimate [...] Read more.
The association of the polyoxyethylene nonyl phenol (Igepal) in aqueous solution has been studied. The results of the fluorescence quenching of 1-Anthracene sulphonate and Safranine T in nonionic micellar solution of Igepal have been presented. The quenching process was exploited to estimate the aggregation number of surfactant monomer. In the Igepal series the micellar aggregation number systematically varied. From the dynamic light scattering studies in micellar solution the polydispersity of the medium and the diameter of the micelles have been determined. The diameters of the micelles have been increased with increase in the molar mass of surfactants. A reasonable estimation of the surface area of the head group in different micelles has been attempted. Full article
Open AccessArticle Cationic Polymerization of 1,2-Epoxypropane by an Acid Exchanged Montmorillonite Clay in the Presence of Ethylene Glycol
Int. J. Mol. Sci. 2003, 4(11), 572-585; doi:10.3390/i4110572
Received: 7 May 2003 / Accepted: 14 October 2003 / Published: 27 October 2003
Cited by 19 | PDF Full-text (290 KB) | HTML Full-text | XML Full-text
Abstract
The polymerization of propylene oxide (PO) catalysed by maghnite-H+ (mag-H+) in the presence of ethylene glycol was investigated. Mag-H+ is a montmorillonite silicate sheet clay was prepared through a straight forward proton exchange process. It was found that [...] Read more.
The polymerization of propylene oxide (PO) catalysed by maghnite-H+ (mag-H+) in the presence of ethylene glycol was investigated. Mag-H+ is a montmorillonite silicate sheet clay was prepared through a straight forward proton exchange process. It was found that the cationic polymerization of PO was initiated by mag-H+ at 20 °C both in bulk and in solution. The effect of the amount of mag-H+ and solvent was studied. These results indicated the cationic nature of the polymerization A possible initiation pathway, via the transfer of protons from mag-H+ to the monomer, is proposed. Full article

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