The purpose of the present investigation deals with a comparative study between the magnitudes of the local viscosity andlor the polarity of the hydrophobic microdomains generated by poly (3-hexadecyl-I-vinylimidazolium bromide) in an aqueous medium using a cinnamylidene molecular rotor and pyrene as fluorescent prohes. Moreover, the results are compared with the data obtained with micelles of conventional surfactants such as the homopolymer repetitive unit model and CTAB.
ABSTRA(JT The behaviour of new cationic amphiphilic copolymers derived from 3-vinylpyridine was studied in aqueous medium. The formation of hydrophobic microdomains was evidenced by fluorescence spectroscopy using a molecular rotor as a fluorescent probe and their structure was visualized by cryo-transmission electron microcospy (Cryo-TEM). The parameters (shape and size) obtained from Cryo-TEM were discussed in relation to the copolymers composition and to the local viscosity defined by the rotor fluorescence quantum yield.
INTRODUCTIONFor the last decades, cationic amphiphilic polymers have received an increasing attention in many fields throughout their physico-chemical properties in aqueous medium. Indeed, their capacity of self-aggregation due to the alkyl side chains interactions gives rise to the formation of a micelle-like microphase structure which can reveal interesting applications in the field of dissolution, transport and reactivity of lipophilic reactants in water. Most of the studies reported in the literature evidence, essentially by means of spectroscopic methods, the formation of hydrophobic microdomains in aqueous polyamphiphiles solutions. Only a few works report on the own structure of these aggregates, and the attempts to determine various parameters such as
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.