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Surface segregation behaviors of blending systems between polysiloxane‐block‐polyimide (SPI) and three polyimides with different chain flexibility (PMDA/ODA, s‐BPDA/ODA, and ODPA/ODA) have been investigated. All film samples with 50 μm thickness were characterized by surface profilometer, attenuated total reflection infrared (ATR‐IR), and ATR microscope. In this study, the films with various PSI contents were processed on a glass substrate. At low concentration of PSI (less than 10 phr), three types of the polyimides trended to migrate to the glass‐side surface, while PSI component trended to migrate to the air‐side surface. For high concentration of PSI (i.e., 10 phr and 30 phr), the glass‐side surface was covered with the polyimides, whereas the air‐side surface showed two different colors. ATR microscope revealed PMDA/ODA blending system exhibited the highest segregation level.
The authors would like to acknowledge the Thailand Research Fund (TRF) and the Commission on Higher Education for the financial support through the Research Grant for Mid‐Career University Faculty of fiscal year 2005–2007. The present research also receives partial financial support from the Foundation for the International Exchange of the Faculty of Engineering, Tokyo Institute of Technology. In addition, CU Graduate Thesis Grant of Chulalongkorn University is also acknowledged. Additionally, the authors would like to thank Mettler‐Toledo (Thailand) Co., Ltd. for the use of Thermogravimetric Analysis.