NCJ Number
12094
Journal
Journal of Forensic Sciences Volume: 18 Issue: 1 Dated: (JANUARY 1973) Pages: 69-81
Date Published
1973
Length
13 pages
Annotation
QUALITATIVE AND QUANTITATIVE POLYMER COMPOSITIONS WERE DETERMINED FOR A REFERENCE COLLECTION OF 40 DIFFERENT ACRYLIC FIBERS OBTAINED FROM THE WORLD'S MANUFACTURERS.
Abstract
THE SCHEME WAS DESIGNED SO THAT RAW-WHITE BULK SAMPLES OR SINGLE DYED FIBERS CAN BE IDENTIFIED BY THE SAME PROCEDURE. THE POLYMER COMPOSITIONS WERE DETERMINED BY INFRARED SPECTROSCOPY USING POTASSIUM CHLORIDE DISCS. THE PHYSICAL CHARACTERISTICS USED WERE SURFACE APPEARANCE AND CROSS-SECTIONAL SHAPE. THE 40 FIBERS EXAMINED WERE DIVISIBLE INTO 15 GROUPS BY QUALITATIVE COMPOSITION AND PHYSICAL CHARACTERISTICS. WHEN QUANTITATIVE COMPOSITIONS WERE DETERMINED IN ADDITION, THE SAMPLES WERE DIVIDED INTO APPROXIMATELY 25 GROUPS. THE PRINCIPAL MONOMERS USED FOR FIBER PRODUCTION ARE SHOWN TO BE METHYL ACRYLATE, METHYL METHACRYLATE, VINYL ACETATE, AND 3METHYL-5-VINYL PYRIDINE. THE PRESENCE OF RESIDUAL SOLVENT IN FIBERS WHICH ARE SPUN FROM DIMETHYL FORMAMIDE AND DIMETHYL ACETAMIDE SOLUTIONS IS DISCUSSED. THE DIFFICULTIES INVOLVED IN ACRYLIC FIBER IDENTIFICATION BY TRADENAME ARE STRESSED AND AN ALTERNATIVE SCHEMATIC PROCEDURE IS SUGGESTED. (AUTHOR ABSTRACT)