The effect of prepolymer crystallinity on solid-state polymerization of poly(bisphenol A carbonate)

Title
The effect of prepolymer crystallinity on solid-state polymerization of poly(bisphenol A carbonate)
Authors
김재훈김영준김재덕Tamer S. AhmedLaura Beth DongGeorge W. Roberts오성근
Keywords
Solid-state polymerization; Poly(bisphenol A carbonate); Prepolymer crystallinity
Issue Date
2010-05
Publisher
Polymer
Citation
VOL 51, NO 12, 2520-2526
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/37418
ISSN
0032-3861
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KIST Publication > Article
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