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- W848625711 abstract "The thermal degradation experiment of sodium salt of poly(γ-glutamic acid)(PGGNa) has been carried out in both its solid phase and solution phase at the range of 57∼120 ℃ and their molecular weight decreasing effect was analyzed as a function of time by means of viscometry and light scattering. Based on the solid phase degradation results, it was supposed that the bond scission rate in a polymer chain kept constant and that the bond scission was occurred on a randomly located position in a polymer chain. For the degradation in solution phase, it was also found that all data at various temperatures were dropped on a single master curve when the reduced time t/t * was used in the plot of the reciprocal intrinsic viscosity (or molecular weight). This degradation curve in solution phase could be expressed as the sum of a single exponential and a linear equation and especially, the single exponential character appeared only at the beginning stage. The activation energy was measured as 107∼115 kJ/mol in this study and agreed with the literature values." @default.
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- W848625711 date "2009-01-01" @default.
- W848625711 modified "2023-09-24" @default.
- W848625711 title "Analysis on Thermal Degradation of Poly($gamma$-glutamic acid) Sodium Salt by means of Light Scattering and Viscometry" @default.
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