The Effect of Tetrakis(hydrogymethyl)phosphonium Chloride (THPC) on Selected Properties of Fibers

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Abstract
The effect of tetrakis(hydroxymethyl)phosphonium chloride (THPC) on the physical and chemical properties of wool. cotton, rayon, nylon, and polyester was examined. THPC had the greatest effect on wool, reducing its flammability and decomposition temperature and increasing the extensibility and dyeability of the fiber. The effect of THPC on cotton and rayon differed, primarily due to the greater extent of reaction of THPC with rayon than with cotton. Both cellulosics became slightly more flame retardant, their decomposition temperatures decreased, and both became more weak and brittle. In addition, THPC-treated rayon showed improved wet wrinkle recovery and dyeabitrty with d rect dyes. THPC reacted with nylon to give a more flame retardant fiber of lower decomposition temperature and greater dyeability, but the treated nylon also exhibited inferior tensile properties. Polyester did not react significantly with THPC and showed only slight changes in properties. THPC treatment had a marked effect on the fibers, and this effect should be considered when preparing finishes containing this reagent.

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