n-Dodecyl-o-Alkyl Pyridinium Bromide 의 Micelle 형성에 관한 연구 = Study for the micelle formation of n-Dodecyl-o-Alkyl-Pyridinium Bromide

다국어 초록 (Multilingual Abstract)

n-Dodecyl-o-Ethyl Pyridinium Bromide (DEPB) and n-Dodecyl-o-Propyl Pyridinium Bromide (DPPB), which are new surfactants, have been synthesized. Surface tension method was used to investigate surface activities of these materials. The variances of critical micelle concentration with temperature for DEPB and DPPB over the range 35℃ to 55℃ have been measured by electrical conductivity method. This result has shown that the critical micelle concentrations of these surfactants increase with increasing temperature.
Critical micelle concentration should always decrease with increasing hydrocarbon chain length since this would increase the strength of a hydrophobic bonding.
To investigate the strength of the hydrophobic bond for micelle formation of
n-Dodecyl-o-Alkyl Pyridinium Bromide, log cmc values of DMPB, DEPB were plotted
against alkyl carbon numbers. We have known that the value of B in this plotting is 0.082 at 35℃ and much smaller than that of general surfactants.
It was obtained from above facts that in micelle formation the strength of the
hydrophobic bonding of short side chain was very different with that of long main chain.