In recent years, considerable effort has been devoted to clarify the structure and dynamics of network formed by wormlike micelles. In the previous studies, we have measured light scattering, small angle x-ray scattering, viscosity, and pulsed-gradient spin echo (PGSE) on semidilute solutions of nonionic surfacts C_(16)E_7, C_(14)E_6, and C_(14)E_7 (C_nE_m represents a chemical formula C_nH_(2n+1)(OC_2H_4)_mOH ). In this study, dynamic light scattering has been measured for the C_(16)E_7 system in order to discuss dynamical aspects of entanglement from the view point of the structural relaxation.
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