Carboxyl Acid Group을 포함한 6FDA-Based 폴리이미드 박막필름의 장시간 에이징에 따른 특성변화Effect of long time physical aging on ultra thin 6FDA-based polylmide films containing carboxyl acid group
- Authors
- Im, Hyungu; Kim, Jooheon; Lee, Hyuksoo; Kim, Taemin
- Issue Date
- Jul-2007
- Publisher
- POLYMER SOC KOREA
- Keywords
- physical aging; fluorinated polyimide; thin film; refractive index
- Citation
- POLYMER-KOREA, v.31, no.4, pp 335 - 342
- Pages
- 8
- Journal Title
- POLYMER-KOREA
- Volume
- 31
- Number
- 4
- Start Page
- 335
- End Page
- 342
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/24035
- ISSN
- 0379-153X
2234-8077
- Abstract
- The goal of this study is to investigate the effect of molecular structure modifications on the kinetics of physical aging of thin films formed from 6FDA-based polyimides with time. The permeability for 6FDA-based polyimide thin films containing carboxyl acid groups commonly decreased 20-50% after the isothermal aging and the selectivity gained anywhere from 10% to 30% while the rate of permeability loss on the change of polymer structure showed different reciprocal relationship between 6FDA-6FpDA based polyimides and 6FDA-DAM based polyimides. The Lorenz-Lorentz equation was used to relate changes in refractive index to densification and volume relaxation with aging time. The permeability as a function of aging time fits the expected form P=Ae((-B/f)). The results matched well with the data for different polymer membranes.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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