𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Silicon-Modified Carbohydrate Surfactants III: Cationic and Anionic Compounds

✍ Scribed by R. Wagner; L. Richter; B. Weiland; J. Weißmüller; J. Reiners; W. Krämer

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
251 KB
Volume
11
Category
Article
ISSN
0268-2605

No coin nor oath required. For personal study only.

✦ Synopsis

Ionic siloxanyl-modified carbohydrate surfactants have been synthesized by alkylation/esterification of precursors containing tertiary amino functions. Depending on the reaction strategy, the siloxanyl moiety is part of the alkylating agent or the substrate. Polyhydroxylated tertiary amines can be quaternized by siloxanyl-modified chloroacetic acid esters or epoxysiloxanes in the presence of glacial acetic acid. The esterification of tertiary amines bearing carbohydrate and siloxanyl subunits by cyclic acid anhydrides yields, after neutralization, carboxylate salts. The reaction of hydroxyl groups and sulfamic acid leads to sulfates. The new substances were characterized by means of 13 C NMR spectroscopy, gas chromatography, elemental analysis and their solubility profile.

📜 SIMILAR VOLUMES

Silicon-Modified Carbohydrate Surfactant
Silicon-Modified Carbohydrate Surfactants II: Siloxanyl Moieties Containing Branched Structures
✍ R Wagner; L Richter; B Weiland; J Reiners; J Weissmüller 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 715 KB

Branched siloxanyl-modified carbohydrate surfactants have been synthesized by coupling mono-, diand poly-functional siloxanes to carbohydrate units either via a branched spacer or by attaching a separate modifying element to a straight-chained structure. Hydrophilic as well as extremely hydrophobic

Silicon-modified carbohydrate surfactant
Silicon-modified carbohydrate surfactants. IV. The impact of substructures on the wetting behaviour of siloxanyl-modified carbohydrate surfactants on low-energy surfaces
✍ R. Wagner; L. Richter; J. Weißmüller; J. Reiners; K. D. Klein; D. Schaefer; S. S 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 323 KB 👁 2 views

The siloxanyl-modified carbohydrate surfactants investigated consist of the four structural elements: (1) siloxanyl moiety; (2) spacer; (3) carbohydrate unit; and (4) modifying element. By static surface tension (␥ lv , ) and wetting tension (␥ sv Ϫ ␥ sl , ␣) measurements the contact angles of aqueo

Precipitation of Mixtures of Anionic and
Precipitation of Mixtures of Anionic and Cationic Surfactants: III. Effect of Added Nonionic Surfactant
✍ Bor-Jier Shiau; Jeffrey H. Harwell; John F. Scamehorn 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 471 KB

The precipitation of an anionic surfactant by a cationic surfactiant in the presence of a nonionic surfictant is examined. The precipitation domains for sodium dodecyl sulfate/dodecylpyridinium ehloride were measured over a wide range of surfactant concentrations as a function of nonylphenol polyeth

Silicon-Modified Carbohydrate Surfactant
Silicon-Modified Carbohydrate Surfactants I: Synthesis of Siloxanyl Moieties Containing Straight-chained Glycosides and Amides
✍ R Wagner; L Richter; R Wersig; G Schmaucks; B Weiland; J Weissmüller; J Reiners 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 872 KB

New siloxanyl-modified carbohydrate surfactants of the amide and glycoside type have been synthesized by coupling between defined as well as highermolecular-weight siloxanes and carbohydrate structures via spacers of different lengths and hydrophilic power. Linear and branched monohydrogen di-, tri-