3. Results and discussions
3.1. Characterization of the amino groups by dropping colour test
This test of analysis is used mainly in order to identify the amino
groups which are immobilized at the surfaces of the treated
polyamine cotton fabrics. Butanetetracarboxylic acid anchor molecule
was used for crosslinking of polyvinylamine and chitosan to
cellulosic cotton surface. Scheme 2 illustrated the proposed mechanism
of this interaction.
Results of finishing show the following values of add on; polyvinylamine
9.7 wt%; chitosan 4.1 wt% and the mixture of both
polyamines 6.7 wt%. The dropping test method was positive for
all the finished samples grafted with polyvinylamine or chitosan
crosslinked by BTCA. The respective blank test showed only easily
yellowish colour or no effect.