Finally, the surface morphology observed by atomic force microscopy also suggests segregation type of phase separation in these blend systems. This behavior confirms the surface segregation phase separation in these polymer blends. The average water contact angle of glass side surface is 77☌ whereas that of the air side is about 102☌ in every blend ratio. Contact angle measurement evidently indicates an enrichment of the hydrophobic siloxane fraction on the blend film surface. X‐ray photoelectron spectroscopy reveals that even at low SPI concentration, the siloxane moieties in the block copolymer tend to segregate into the air side surface. The glass substrate used in the film‐casting process shows significant effect on the migration of surface segregated species to enrich the air‐exposed surface, whereas the more polar s‐BPDA/ODA tends to remain close to the polar glass substrate. These polyimide blends, having various compositions of the SPI, were processed by a solution casting method. Scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) provided topographical and bulk composition information. Surface segregation in polymer blend systems between 3,3′,4,4′‐biphenyltetracarboxylic dianhydride/4,4′‐diaminodiphenyl ether (s‐BPDA/ODA) polyimide and block copolymer based on polysiloxane‐block‐polyimide (SPI) has been investigated. New siloxaneurethane block copolymers were synthesized and the effect of a siloxane moiety on microphase segregation in soft/hard block copolymers was studied by several analytical methods. Rimdusit, Sarawut Benjapan, Wanpen Assabumrungrat, Suttichai Takeichi, Tsutomu Yokota, Rikio depolymerizing the siloxane backbone in the presence of an excess of an appropriate endblocker using a strong base or acid as catalyst. (XPS) or time of flight-secondary ion mass spectrometry. In the case of without vinyl side chains, the relative amount of the ring was the lowest, which is coincident with the fact that the film contained the network-type more than the cage-type measured by FTIR (Fig. Surface segregation of siloxane containing component in polysiloxane‐ block ‐polyimide and s ‐BPDA/ODA polyimide blends Surface segregation of siloxane containing component in polysiloxane‐ block ‐polyimide and s. Corresponding height or area can then be correlated to a. Here, the silica backbone was defined as a sum of the peak areas of poly-siloxane and the six-membered-ring.
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