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- W2357397792 abstract "In this study, chain dynamics of polystyrene surface under high pressure carbon dioxide(CO2) was characterized by a modified nanohole recovery method. The results show that, under high pressure CO2, the recovery times for the nanoholes are significantly reduced, which indicates that the moving ability of the surface chain segment is increased significantly. In addition, the thickness of the surface layer with high mobility is greatly increased by higher pressure CO2, which was suggested by the decreased remaining depth of the nanoholes after the recovery. Applying this phenomenon, two PS thin films were bonded together at different temperatures with the assistance of high CO2 pressure. The bonding strength was qualitatively characterized by separating the two bonded films with an adhesive tape, which shows that at 70℃ and under vacuum, no bonding occurres and the separated contact surfaces are smooth. Under 2.07 MPa CO2 and at 70℃, the bonding strength is lower, and the contact surface of bilayer sample shows a roughness with several nanometers. While under the same CO2 pressure and at 80℃, the bonding strength is much higher and after separating, the contact surface of bilayer sample has a higher roughness. Associating the thickness of the surface with high mobility under high CO2 pressure with the bonding experiment results, it could be concluded that the two films could be well bonded only when the thickness of the surface with high mobility is more than 7.0 nm. The nanoholes recovery method could be applied to predict the bonding strength of bilayer samples bonded at different conditions." @default.
- W2357397792 created "2016-06-24" @default.
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- W2357397792 date "2014-01-01" @default.
- W2357397792 modified "2023-09-23" @default.
- W2357397792 title "Surface Chain Segment Dynamics of Polystyrene under High Pressure Carbon Dioxide" @default.
- W2357397792 hasPublicationYear "2014" @default.
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