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By Shields M. C.

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Extra resources for A Determination of the Ratio of the Specific Heats of Hydrogen at 18 and -190C

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These materials are commercially produced by reaction of ethylene oxide with an active hydrogen-containing compound using a basic catalyst. The reaction can be represented by the following general equation: For commercially available surfactants R represents either H (as for polyethylene glycols) or a hydrophobic group (usually C1 to C20), and X represents a heteroatom such as O, S, or N. The number of moles of ethylene oxide reacting with the initiator (RXH) need not be an integer and represents the number average degree of polymerization of the ethylene oxide in the product.

70] suggested that the sixth polyoxyethylene adduct represents the highest stability of the series of oligomers, RO(EO)x-, with stability increasing for x = 16 and decreasing with x > 6. This effect has been seen in studies involving the use of soluble group I metal hydroxides [67,42,27,70,71] as well as aliphatic tertiary amines [27,72]. Weibull [71] recently investigated the reaction of ethylene oxide with 3-phenyl-1-propanol using lithium, sodium, and potassium as the counterion for the alkoxide.

Nonionic Surfactants: Organic Chemistry, edited by Nico M. van Os ADDITIONAL VOLUMES IN PREPARATION Anionic Surfactants: Analytical Chemistry, Second Edition, Revised and Expanded, edited by John Cross Page i Nonionic Surfactants Organic Chemistry Edited by Nico M. V. Amsterdam, The Netherlands Page ii ISBN: 0-8247-9997-6 The publisher offers discounts on this book when ordered in bulk quantities. For more information, write to Special Sales/Professional Marketing at the address below. This book is printed on acid-free paper.

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A Determination of the Ratio of the Specific Heats of Hydrogen at 18 and -190C by Shields M. C.

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