Diffusion-limited kinetics modeling of one-step polyimide formation
Lu, HB; Zhou, J; He, TB
AbstractA diffusion-limited kinetic model was developed to describe the imidization of one-step polythioetherimide formation based on an endgroup diffusion model. The changes of conversion and viscosity during the imidization were monitored with thermogravimetric analysis and dynamic stress rheometry, respectively. It was observed that the imidization rate began to decelerate after a fast early stage, whereas the viscosity in the system increased dramatically after a period of low value. Amic acid and imide formations concurrently take place in the one-step polyimide formation, but the formation of amic acid is much slower than that of imide and is the rate-limiting step of imidization. When a second-order kinetic model was used to describe the imidization, the effect of viscosity on the diffusion resistance of reactive groups needed to be included. In order to predict the change of viscosity during the imidization, the Lipshitz-Macosko model was modified and introduced into the diffusion-limited kinetic model by the Stokes-Einstein equation. The comparison of the modeled results with experimental data indicated that the diffusion-limited kinetic model and the modified Lipshitz-Macosko model were able to efficiently predict the changes of conversion and viscosity with temperature and time during the one-step polythioetherimide formation. (C) 2001 John Wiley & Sons, Inc.
KeywordDiffusion Kinetics Modeling Polyimide Formation
Indexed BySCI
WOS IDWOS:000166649100015
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Document Type期刊论文
Corresponding AuthorHe, TB
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Mat Engn, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Lu, HB,Zhou, J,He, TB. Diffusion-limited kinetics modeling of one-step polyimide formation[J]. JOURNAL OF APPLIED POLYMER SCIENCE,2001,79(11):2052-2059.
APA Lu, HB,Zhou, J,&He, TB.(2001).Diffusion-limited kinetics modeling of one-step polyimide formation.JOURNAL OF APPLIED POLYMER SCIENCE,79(11),2052-2059.
MLA Lu, HB,et al."Diffusion-limited kinetics modeling of one-step polyimide formation".JOURNAL OF APPLIED POLYMER SCIENCE 79.11(2001):2052-2059.
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