BRIEFS Pyrolysis—Gas Chromatographic Technique. Effect of Temperature on Thermal Degradation of Polymers
No.
32
Three polymers—nitrocellulose, polyvirryl alcohol, and poly(ri-butyl methacrylate)—were pyrolyzed between 300° and 950° C. The composition of the breakdown products at the different temperatures is tabulated.
in the
ADVANCES IN
KITTY ETTRE and P. F. VARADI, Machlett Springdale, Conn.
CHEMISTRY
Anal. Chem. 35, 69 (1963)
Gas Chromatographic Analysis of Poly e t h y l e n e Ethyl Acrylate) and Polytethylene Vinyl Acetate) Pyrolyzates
SERIES
BORAX TO BORANES With preface
Pyrolysis is discussed and compared with recent thermal decomposition studies made by other methods. An absolute accuracy of 2 % was obtained in correlation with neutron activation oxygen analysis of both polymer types. Results indicate the iisefulness of pyrolysischromatography in combination in determining copolymer ratios. E. M. BARRALL II, R. S. PORTER, and J. F. J O H N S O N , Cali fornia Research Corp., Richmond, Calif.
by
PROFESSOR THOMAS WARTIK Pennsylvania
State
Among the applications of boron and the boranes discussed in this definitive monograph are those to nuclear reactors, "exotic" jet engine and rocket fuels, and semiconductors. Boron is, because of its elec tronic structure, an extremely versatile element and forms a great variety of compounds of potential but unrealized usefulness. Boron chemistry is one of the new frontiers in organo-inorganic chemistry. Therefore, this volume is of interest and importance to chemists in any of the fundamental fields, as well as to specialists in the theory of valency, crystal structure, metallo-carbon compounds, the chemistry of explosion, and the history of chemistry.
Order
Paper bound.
Anal. Chem. 35, 73 (1963)
University
This is a collection of 27 papers given at two ACS symposia (1958 and 1959) on the production of boron hydrides from borax, and on the chemistry of the boranes. Five papers are included on the fund amental chemistry of boron, and one on the history of this element and its compounds.
244 pages.
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Quantitative Preparation of Methyl Esters of Fatty Acids for Gas Chromatography Studies were made on the use of the silver salt-alkyl halide esterification procedure to determine the quantita tive aspects of the reaction of iodomethane with the silver salts of the acids. GLC was then used without extensive concentration. Reproducibility and recovery studies were made. T h e methods were found to be simple, accurate, and precise. C. W . GEHRKE and D. F. GOERLITZ, University of Missouri, Columbia, Mo. Anal. Chem. 35, 76 (1963)
Chromatographic Separation of the Steroids from Total Lipide Extracts Silicic acid, activity-IIB, is used in column chromatog raphy; benzene is used to remove fats, fatty acids, sterols including cholesterol, and cholesterol esters, fol lowed by acetone-chloroform to remove the steroids. Finally, absolute methanol is used to remove the major ity of the phospholipides. Recovery of steroids, meas ured by using C 14 -labeled steroids and spot tests, is on the order of 9 5 % or better. RAYMOND HERNANDEZ, Jr., and L. R. AXELROD, Southwest Foundation for Research and Education, San Antonio, Tex. Anal. Chem. 35, 80 (1963)
Automatic Column Chromatography of Ether and Water-Soluble 2,4-DinitrophenylDerivatives of Amino Acids, Peptides, and Amines Thirty-five derivatives of 2,4-dmitrofluorobenzene are separated with one column in 22 hours. Resolution is sensitive to the hydration of the silica gel and to the col umn temperature which affords a means of separating cer tain DXP-derivatives. As little as 0.01 /tmole of D N P amino acid gives an identifiable peak. LEO KESNER, EDWARD MUNTWYLER, G. E. GRIFFIN, and J O A N ABRAMS, State University of New York, Brooklyn, Ν. Υ. Anal. Chem. 35, 83 (1963) VOL.
35, NO. 1, JANUARY 1963
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