Chitosan ¯akes (Flonac N) was supplied by Kyowa
Technos, Japan and its viscosity of 0.5 wt% solution is
100±500 cP. N-methylol nylon 6 was a product
obtained from the reaction of nylon 6 and formaldehyde.
A 33% methylol-substituted nylon 6 was used
[12]. All the organic solvents used in this study were of reagent grade and were obtained from BDH Chemicals.