Stearic anhydride

Stearic anhydride, 1117 Stearolic acid, 603,946,1021,1036 Stearyl alcohol, 225 Stearyl bromid 657 Stephan reaction, 1116 Sterculic add, 1021-1022 Steroid acetonides, 801-802 Steroid diosphenols, 159-160 Stigmastadienone, 775-776, 889 Stigmasterol, 775-776, 889 CM-Stilbene, 156,967-968,975,1234 epoxide, 610,1192... 

More recently [22], a poly-(aminoamide-epichlorohydrin)/stearic anhydride compatibilizer system was developed to optimize the interface between pine flour and polyethylene in the corresponding composites. FTIR spectra showed that the compatibilizer had indeed been grafted to the wood particles and the decrease in water uptake by the composite corroborated the interest in using this novel system. 

The treatment of wood fibres with isocyanate-bearing molecules and their incorporation into polyethylene were also recently studied [44]. In particular, the use of poly-(diphenylmethane diisocyanate) (XV) increased both the modulus of rupture (MOR) and the modulus of elasticity (MOE) of the ensuing composites. The use of stearic anhydride (XVI) as a novel compatibilizer further improved both MOR and MOE and enhanced the water resistance of the composites. 

The reaction mixture was allowed to stand with acetic anhydride for 15 h at 22°c, with caprylic and stearic anhydride for 3 h at 60°c, or with maleic and phthalic anhydride for 10 h at 60°c. The isolation, e.g. of monostearates, was made by extraction with 1-butanol ( ) after addition of 10% aq sodium chloride to the DMF. 

Table VII.Composition of esterification products of sucrose chelates and alcoholates with caprylic or stearic anhydride in DMF, 3 h, 60°C, mole-%.

A new method for determination of hydroxyl groups in primary alcohols and secondary alcohols, but not tertiary alcohols, has been described by Sully in which stearic anhydride is used instead of acetic anhydride. Among the compounds successfully assayed were citronellol, geraniol, benzyl alcohol, phenylethyl alcohol and menthol. The procedure has also been used for determining phenols including eugenol. 

Stearic anhydride. Mix 1000 g of stearic acid (a commercial grade of stearic acid is suitable, provided that it has a good heat stability, an iodine value below 4 and crystallises well) and 550 g of acetic anhydride and boil under a reflux condenser for eight hours. Remove the excess of acetic anhydride and the acetic acid formed during the reaction, under vacuum, taking care that the temperature does not rise above 135 . 

Titrate the mixture resulting from Procedure A or B, while still hot, with N sodium hydroxide using phenolphthalein as indicator the phenolphthalein indicator must not be added before the stearic anhydride is completely decomposed, since it is normally made up in spirit solution. If unchanged stearic anhydride is present the phenolphthalein will bleach during the titration with alkali and, if this is the case, the determination must be abandoned. 

Note The weight of sample taken should be such that the titre is approximately two-thirds of that equivalent to the stearic anhydride used—found from the blank determination—which corresponds to a 50 per cent excess over the theoretical. 

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