Tests for the gelation of solutions of atactic polystyrene
作者:
Donald J. Plazek,
Timothy Altares,
期刊:
Journal of Applied Physics
(AIP Available online 1986)
卷期:
Volume 60,
issue 8
页码: 2694-2698
ISSN:0021-8979
年代: 1986
DOI:10.1063/1.337097
出版商: AIP
数据来源: AIP
摘要:
The shear creep and recovery behavior of narrow molecular weight atactic polystyrene (APS) (6.7×105Mw) solutions (27.3 wt. %) in two solvents (n‐amyl andn‐butyl acetate) were studied at various temperatures down to −83 °C above and below reported thermoreversible gel points (∼−50 °C). In both cases viscous flow was measured above and below the reported gel points. The resulting compliance curves for two solutions (n‐amyl andn‐butyl acetates) were successfully reduced toT0=−82 and −61 °C, respectively, indicating viscoelastic liquid response down to −82 °C. These solutions were clear. A solution of 18.7% APS (3.9×105Mw) in iso‐amyl acetate was also studied. It responded similarly to the first solutions untilT=−49 °C when it became cloudy, indicating phase separation. At lower temperatures the viscosity increased dramatically, suggesting gel‐like behavior.
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