Rubber

Rubber

“…The use of the 911-cm-1 band to measure 1,2addition and the 967-cm-1 band for trans-1,4-addition is generally ac- cepted. The cis-1,4-content has been measured by any of several infrared bands or by difference from 100% or from total unsaturation found by chemical means (211). The 1308-cm-1 band gives precision of 5% relative (88).…”

Gas Chromatography

“…Steroid separations by GC were reviewed through the end of 1963 (456) as was the gas chromatographic separation of lipids (301 667). applied reviews issue of ANALYTICAL CHEMISTRY cites several hundred references to applications of gas chromatography published during 1963 and 1964 in the fields of air pollution (22), clinical chemistiy (360) , coatings (589), essential oils and related products @go), pharmaceuticals and drugs (661), rubber (651), and solid and gaseous fuels ( 7 ) . In addition to these reviews, the status of GC in the criminalistics laboratory has been reviewed (363) as has its application to carbohydrate analysis (67), the separation of the isotopes and isomers of hydrogen (1 7 ) , and pyrolysis techniques (479) ' The Preston Technical Abstracts Co. (506) continues its excellent service to workers in the field of gas chromatography by issuing weekly abstracts of all papers and major addresses on 5-X 8inch needle sort notched cards, often within a matter of weeks following publication of the original article.…”

“…Steroid separations by GC were reviewed through the end of 1963 (456) as was the gas chromatographic separation of lipids (SOI, 667). The 1965 applied reviews issue of Analytical Chemistry cites several hundred references to applications of gas chromatography published during 1963 and 1964 in the fields of air pollution (22), clinical chemistry (360), coatings (589), essential oils and related products (240), pharmaceuticals and drugs (661), rubber (651), and solid and gaseous fuels (7). In addition to these reviews, the status of GC in the criminalistics laboratory has been reviewed (363) as has its application to carbohydrate analysis (67), the separa-and yield in a single apparatus, Scott (554) points out that while the choice of one of these desirable operating characteristics precludes the remaining two, some compromise in the column system may be made to obtain a reasonable performance in all three aspects.…”

Rubber

“…By design, the previous review article in this series did not dwell upon physical methods for the characterization of rubbers in terms of molecular weight, molecular weight distribution, transition behavior, etc. (222). The present review7 will cover some of these subject areas.…”