BRIEFS Molecular Distillation of Thermally Supersensitive Liquids With the apparatus described, it is possible to distill and separate thermally supersensitive liquids up to a molecu lar weight of approximately 2000. W . A . FRANK and H. D. KUTSCHE, J E N A E R SCHOTT & GEN., Mainz, W . Germany
3RD CUMULATIVE
GLASWERK
ANALYTICAL
Anal.Chem. 36, 2167 (1964)
CHEMISTRY
INDEX
Infrared Determination of Hydroxyl Content of Oxidized Polyethylene The analysis measures acetyl group content after quanti tative acetylation by use of the 1245-cm. -1 C—Ο stretch ing vibration band typical of acetate ester, and equates this to t h e hydroxyl content. DAVID E. KRAMM, J O H N N. LOMONTE, and JOSEPH D. MOYER, Washington Research Center, W . R. Grace & Co., Clarksville, M d . Anal. Chem. 36, 2170 (1964)
1959^1963 The third ANALYTICAL CHEMISTRY INDEX, covering the last five years is now available.
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Calorimetric Studies by Differential Thermal Analysis A new differential thermal analysis cell is described which permits precision calorimetry on polymers and inorganic samples. This cell's performance is illustrated and com pared with conventional cells. EDWARD M. BARRALL I I , ROGER S. PORTER, and JULIAN F. J O H N S O N , California Research Corp., Richmond, Calif.
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CUMULATIVE ANALYTICAL CHEMISTRY INDEX (1959-1963) High Resolution Nuclear Magnetic Resonance Analysis of Vinyl Acetate Copolymers The dibutyl fumarate, dibutyl maleate, dioctyl 2-ethylhexyl acrylate content of vinyl acetate was determined. T h e method is estimated to to within 2 mole % absolute in the range mole % comonomer.
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maleate, or copolymers be accurate of 0 to 20
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Mass Spectrometry of Naturally Occurring Alkenyl Phenols and Their Derivatives CITY
The mass spectra of the compounds studied have base peaks resulting from fission β to the benzene ring with the rearrangement of one hydrogen atom. Application to the analysis of some naturally occurring compounds and their ozonolysis products is described. J . L. OCCOLOWITZ, Department of Supply, Defence Standards Laboratories, P. O. Box 50, Ascot Vale, V i c , Australia
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Anal. Chem. 36, 2177 (1964) V O L . 36, NO. 1 1 , OCTOBER 1964
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