| 초록 |
The solution of poly (vinylidene-fluoride), whose molecular weights were 145,000, in DMAc was rheologically investigated by ubbelohode viscometer and advanced rheomertic expansion system(ARES) for diluted and concentrated soution system respectively. In the dilute concentration regime, intrinsic viscosity was decreased with increasing temperature in the temperature range of 30 to 70oC. In the high concentration regime, the dynamic viscosity showed very complicated behavior with increasing temperature. Increasing concentration generally increased viscosity and storage modulus. There was an unusual increase of viscosity in the temperature range 30 to 70 oC. Loss tangent value of poly (vinylidene-fluoride) solution suggested gel property with increasing temperature. Relaxation time was also increased as concentration and temperature were increased. In the modified Cole-Cole plot, the slope of solutions was decreased by increasing temperature. |
