Density Changes in Cellulose Treated With Urea-Formaldehyde Resins

Steele, Richard; Schiwall, Raymond P.

Density Changes in Cellulose Treated With Urea-Formaldehyde Resins

1959

Steele, Richard | Schiwall, Raymond P.

Density changes produced in cotton and rayon fabrics by treatment with four thermo setting resin precondensates have been determined in density gradient columns. With the assumption that the density of resin cured in vitro corresponds to its density in the fiber, the results indicate that the predominant effect is fiber swelling, with very little resin being deposited in void spaces not previously accessible to the solvent mixture in the gradient column. Scouring the treated fabric to remove reaction residues lowers the density, indicating that the fiber structure does not collapse, presumably because it is stabilized by the reacted resin. The effect of resin concentration on moisture regain was also determined with these samples. The results are consistent with the changes in mechanical properties observed for cross-linking and non-cross-linking resins on cotton and rayon.

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