Morphology Control of Polyimide Fibers by Phase Separation under Different Coagulation Bath Conditions

Jie Dong; Chao Qing Yin; Hong Xu Lu; Zi Xin Zhang; Qing Hua Zhang

doi:10.4028/www.scientific.net/MSF.789.142

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HomeMaterials Science ForumMaterials Science Forum Vol. 789Morphology Control of Polyimide Fibers by Phase...

Morphology Control of Polyimide Fibers by Phase Separation under Different Coagulation Bath Conditions

Abstract:

In order to investigate the effects of the coagulation bath temperature and composition on the formation of polyimide fiber in wet spinning, theoretical ternary phase diagrams of water/NMP/PI system at two coagulation bath temperatures was investigated based on the extended Flory-Huggins theory. The cloud-points data of the system for more dilute PI terpolymer solutions were determined by cloud point titration, and the cloud point data for more concentrated PI terpolymer solutions were calculated by Boom's linearized cloud point curve correlation. The obtained diagrams showed that if the titration process constructed at a higher temperature, the meta-stable two-phase region in the ternary phase diagram increases, which is beneficial for the de-mixing of the filament via nucleation and growth mechanisms, resulting in a homogenous dense structure for PI fiber.

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Periodical:

Materials Science Forum (Volume 789)

Pages:

142-147

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https://doi.org/10.4028/www.scientific.net/MSF.789.142

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Online since:

April 2014

Authors:

Jie Dong*, Chao Qing Yin, Hong Xu Lu, Zi Xin Zhang, Qing Hua Zhang

Keywords:

Morpholoy, Phase Diagram, Pi Fiber, Temperature

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