Determination of Methylene Groups in Disulfide and Methylene Sulfide Crosslinks in Polycaprolactam Fibers
260 ## - PUBLICATION, DISTRIBUTION, ETC.
Name of publisher, distributor, etc.
[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology,
Date of publication, distribution, etc.
1962.
500 ## - GENERAL NOTE
General note
/pmc/articles/PMC5310683/
520 ## - SUMMARY, ETC.
Summary, etc.
Recent publications from this laboratory describe some unusual properties, such as crimping and helical coiling, induced by heterogeneous, chemical crosslinking of polycaprolactam fibers. The following crosslinks are involved: [Figure: see text] It has been found that the -CH(2)-groups in these crosslinks can be hydrolyzed to yield one equivalent of formaldehyde for each equivalent of hydrolyzable methylene group. This permits the application of the chromotropic acid method for determining formaldehyde to the estimation of the number of crosslinks in the fiber, when used in conjunction with a previously reported conductometric method for the determination of sulfhydryl groups. A general method has been worked out, with special attention to sulfur-containing degradation products (of the crosslinks) that may interfere with the analysis.
540 ## - TERMS GOVERNING USE AND REPRODUCTION NOTE
Terms governing use and reproduction
540 ## - TERMS GOVERNING USE AND REPRODUCTION NOTE
540 ## - TERMS GOVERNING USE AND REPRODUCTION NOTE
Terms governing use and reproduction
The Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
546 ## - LANGUAGE NOTE
Language note
en
690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN)
