Novel cationic cotton fabrics were prepared by pretreating the fabrics
with betaine acidic solution with a pad–dry–bake method. FTIRART
analysis of the cotton fabrics with different treatment procedures
showed that ester bonds formed under pretreatment conditions and
could break under steaming fixation conditions. Tensile strength of
the cationic fabrics decreased by about 5% compared with that of the
untreated ones, while the whiteness of the cationic ones increased a little
bit. It showed that with the salt-free dyeing method, higher dye fixation
was obtained on the cationic fabrics and more dyes could