|Title:||共不溶現象對高分子造膜系統之影響(2/3)||Authors:||楊台鴻||Keywords:||共非溶劑;三成份作用力參數;cononsolvency;ternary interaction parameter||Issue Date:||31-Jul-2003||Publisher:||臺北市：國立臺灣大學醫學工程學研究所||Abstract:||
本文主要研究高分子共非溶劑NMP -MC-PEI 系統的熱力學行為，除了利用
The phase behavior of poly (ether imide) (PEI) in solutions composed of
N-methyl-2-pyrrolidone (NMP) and methylene chloride (MC) was studied at 25°C.
The pair of solvents used to dissolve PEI has been selected for the purpose to perform
a cononsolvent system. From the observed phase behavior, PEI was soluble in either
NMP or MC individually but liquid-liquid demixing was observed in mixtures of
NMP and MC. However, no cononsolvency was found by the theoretical prediction
on the basis of Flory-Huggins formalism including three binary interaction parameters.
Therefore, attempts were made to correlate the phase behavior of a cononsolvent
system with the modified Flory-Huggins theory using a ternary interaction parameter.
A good prediction was obtained when a composition-dependent ternary interaction
parameter was included into calculations. In addition, the mechanism of
cononsolvency and its relation with the ternary interaction parameter in the
cononsolvent systems were discussed. Based on the analysis of IR spectroscopy, the
ternary interaction parameter correlates well with a more intermolecular complexation
of NMP with MC in the presence of PEI. Thus, the driving force for cononsolvency
results from the formation of the NMP-MC complexes favoring over NMP-MC-PEI
contacts, leading to exclude PEI segments in the vicinity of the NMP-MC complexes.
|Appears in Collections:||醫學工程學研究所|
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