Citation: LI Junbai, YIN Rui, MA Rongjiu, Shen Jiacong. DYNAMIC LIGHT SCATTERING STUDY ON TRANSLATION DIFFUSION OF 8-ARM STAR POLYSTYRENE IN GOOD AND THETA SOLVENTS[J]. Chinese Journal of Polymer Science, ;1992, 10(3): 236-241. shu

DYNAMIC LIGHT SCATTERING STUDY ON TRANSLATION DIFFUSION OF 8-ARM STAR POLYSTYRENE IN GOOD AND THETA SOLVENTS

Received Date: 26 June 1991

The technique of dynamic light scattering has been used to investigate the translation diffusion behavior of 8-arm star polystyrene (SPS)in a good solvent, tetrahydrofuran (THF) or benzene (BZ) and a theta solvent, cyclohexane (CH), by homodyne photon correlation spectroscopy .The intensityintensity autocorrelation function was analyzed by the method of cumulant. The translation diffusion coefficients have been obtained as a function of temperature and concentration. Under theta condition ,the non-concentration dependence of diffiusion coefficient showed the unperturbed Gaussian state of the SPS molecular chain.The different hydrodynamic radii estimated from Stokes-Einstein equation reflected the stretch extent of the arm chain for regular star polymer.The data of diffusion activation energy of SPS in THF,BZ and CH were also obtained respectively.
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