Abstract
Several new dialkyldibenzene disulfonate Gemini surfactants with high viscosity have been synthesized by a new method and analysed by 1H NMR, ESI-MS, and IR. The influence of spacer and alkyl chain length on their melting temperatures and Krafft temperatures were researched. These surfactants exhibit special viscoelastic properties even in dilute solutions without addictives, which can be observed visually and also researched by cone-plate rheometer at different concentrations.
Acknowledgements
The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant No. 20953004) and the Doctor Fund Project of Shandong Province (Grant No. BS2009SF019).
Notes
nspacer is referred to spacer carbon number.
neff is referred to alkyl chain carbon number including benzene ring(= 3.5 C).