Novel monovalent quaternary ammonium surface monomer 1undecylmethacrylate-1-bromide-1

4-dimethylpiperazine(PQⅠ) and divalent quaternary ammonium surface monomer 1-undecylmethacrylatedibromide-1

4-dimethylpiperazine(PQⅡ) were synthesized successfully by using methacryloyl chloride

11-bromoundecan-1-ol

1

4-dimethylpiperazine and methyl bromide as raw materials under the suitable conditions.As-synthesized products(PQⅠ and PQⅡ) were characterized by 1H NMR spectroscopy and elemental microanalysis respectively.Additionally

the critical micelle concentrations(CMC) and surface tension were also measured.The results show that PQⅠ and PQⅡ can be synthesized easily through three steps(once acryloyl chloridation and twice quaternary) under the suitable conditions.In 25 ℃ pure water

the CMC of PQⅠ and PQⅡ are 44.6 mmol/L and 67.3 mmol/L respectively and the corresponding surface tension γCMC are 35.5 mN/m and 37.9 mN/m.