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Poly(ethyleneimine) (PEI) and bovine serum albumin (BSA) were investigated as pretreating agents for surface modification of the cotton fibres. The measurement of zeta potential was initially used to indicate the effectiveness of the pretreatment. It was found that the PEI largely developed the positive charge whereas the BSA slightly enhanced the positive charge on cotton fibres following a decrease...
The effect of poly(ethyleneimine) (PEI) on the adsorption and desorption of lac dye (Natural dye 25; CI 75450) on cotton fibres is reported. We show that PEI increases the dye adsorption and decreases any subsequent desorption of lac dye from the cotton fibres. At equilibrium, the ratio of the number of molecules of lac dye per ethyleneimine repeat unit is ~1 in solution but it is close to 3.5 when...
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