Weak neutralization degree effect on the surfactant properties of poly(N-octyl-4-vinylpyridinium bromide) [P4VPC8-50]

Ali Mansri, Samia Benmiloud, Nassima Ramdani, Brahim Bouras, Lahcène Tennouga
The objective of this paper is to study the surfactant behavior of the copolymer poly(N-octyl-4-vinylpyridinium bromide) [P4VPC8-50], with a sweep of neutralization degree, and compared to that of surfactant model N-dodecyl-pyridinium chloride (DPC). We found that the surface tension decreases as a function of the neutralization degree. Samples with low quaternization rates and short chains have no surfactant character. The increase of the neutralization degree improves the behavior surfactant
more » ... ehavior surfactant of the copolymers with considerable chain length. We note that above a certain values of , the addition of hydrochloric acid does not change the value of the critical micelle concentration (CMC) in the surfactant copolymer with long chain length. The result shows that the length of the side chain, the neutralization degree, the balance of hydrophobic/hydrophobic interactions, hydrophilic/hydrophobic interactions and electrostatic interactions play a very important role.