The effect of prepolymer crystallinity on solid-state polymerization of poly(bisphenol A carbonate)
- The effect of prepolymer crystallinity on solid-state polymerization of poly(bisphenol A carbonate)
- 김재훈; 김영준; 김재덕; Tamer S. Ahmed; Laura Beth Dong; George W. Roberts; 오성근
- Solid-state polymerization; Poly(bisphenol A carbonate); Prepolymer crystallinity
- Issue Date
- VOL 51, NO 12, 2520-2526
- The effect of prepolymer crystallinity on the solid-state polymerization (SSP) of poly(bisphenol A
carbonate) was examined using nitrogen as a sweep fluid. A low-molecular-weight prepolymer was
synthesized by melt transesterification and prepolymers with different crystallinities (11.7%, 23.3%,
33.7%) were prepared with supercritical carbon dioxide treatment. SSP of the three prepolymers was
then carried out at reaction temperatures in the range of 150-190 ℃, with a prepolymer particle size of
75 ㎛ and a N2 flow rate of 1600 ml/min. The glass-transition temperature (Tg), absolute weight-average
molecular weight (Mn), and percent crystallinity were measured at various times during each SSP. At
each reaction temperature, SSP of the lower crystallinity prepolymer (11.7%) always resulted in highermolecular-
weight polymers, compared with the polymers synthesized using the higher crystallinity
prepolymer (23.3% and 33.7%). The crystallinity of the polymers synthesized from the high crystallinity
prepolymer was significantly higher than for those synthesized from the low crystallinity prepolymer.
Higher crystallinity of the prepolymer and the synthesized polymers may lower the reaction rate by
reducing chain-end mobility or/and by inhibiting byproduct diffusion.
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