Multi-alkylated surfactants of partially-quaternized 2- or 4-vinylpyridine telomers having multi-dodecyl side chains (nL-2VPQ and nL-4VPQ; n, number of chains) were derived from telomers with polymerization degree (Pn) 5-20, prepared by the polymerization of 2- or 4-vinylpyridine in dodecanethiol as solvent, and examined for surface activity. Surface tension of the aqueous solution (pH 2) was 32-33mNm^-1 for 3.2-9.5L-2VP⁺Q with Pn 11 and 37mNm^-1 for 3.2L-4VP⁺Q with Pn 10. This parameter varied with the number of dodecyl chains and critical micellar concentration (cmc) decreased with increase in this number. Suface tension and cmc were determined in part by the particular positions of chains on the pyridine ring and polymerization degree. nL-2VP⁺Q with Pn 11 was more efficient in reduceng surface tension and depressing cmc than nL-4VP⁺Q and nL-2VP⁺Q with Pn 20. Toluene was emulsified by shaking with nL-2VP⁺Q or nL-4VP⁺Q solution. Dodecyl chain number affected the extent by emulsification and nL-2VP⁺Q with Pn 11 emulsified more than nL-2VP⁺Q with Pn 20 or nL-4VP⁺Q. Surface activity was greatest when using 3.2-6.2L-2VP⁺Q with Pn 11.