- Author
- Healy, E. M. | Natsios, B. A.
- Title
- Preparation and Characteristics of Calcium Salt of Nylon-Acrlic Acid Graft Polymer. Initial Study. July 1964-February 1966.
- Coporate
- Army Natick Laboratories, MA
- Report
- Technical Report 67-52-CM; C&OM-30, November 1966, 24 p.
- Distribution
- Available from National Technical Information Service
- Keywords
- thermal radiation | acids | dyes | dyeing | textiles | calcium | nylon (trademark) | fibers | temperature
- Identifiers
- sorption; desorption; polyacrylic acid; graft copolymer; equilibrium
- Abstract
- The calcium salt of acrylic acid/nylon 6,6 graft polymer has been reported to show promise in flash-resistant fabrics. This report covers the initial phases of a systematic study of the preparation of the calcium form, and its characteristics in various aqueous solutions. The rate of sorption of calcium ion from solution was influenced primarily by changes in temperature, the desired value of 3.5 percent calcium being attained in 5 minutes at 100 deg C, 9 minutes at 70 deg C, and 64 minutes at 30 deg C. A continuous process for calcium treatment is therefore possible. The effect of solution concentration on rate of calcium sorption was much less significant, and increases in soltuion concentration above 1 percent caused no change in rate. The amount of calcium sorbed at equilibrium at 30 deg C was lower than 70 deg or 100 deg suggesting a change in the character of the fiber at some intermediate temperature. The isotherm for calcium sorption was of the Langmuir type. Removal of the calcium was difficult with neutral detergents, but was readily accomplished with calcium complexing phosphates or with acid.