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|Author(s):||Brian Berry; August W. Bosse; Jack F. Douglas; Ronald L. Jones; Alamgir Karim;|
|Title:||Orientational Order in Block Copoloymer Films Zone Annealed Below the Order-Disorder Transition Temperature|
|Published:||August 11, 2008|
|Abstract:||Cold zone annealing (CZA) is a thermal treatment involving pulling a thin block copolymer (BCP) film over a heated region having a temperature significantly above the glass-transition temperature, but well below the film order-disorder temperature. We investigate the potential of CZA for controlling defects in block copolymer thin films and as a platform for studying defect formation, annihilation, and dynamics. The dramatic increase in orientational order obtained by CZA relative to conventional oven annealing methods is attributed to the large in-plane mobility gradient that accompanies the in-plane temperature gradient in glassy polymeric materials. This mobility gradient leads to a progressive alignment of cylinders in the sample pulling direction and presumably to a substantial modification of the defect annihilation dynamics during grain growth.|
|Pages:||pp. 2789 - 2794|
|Keywords:||block copolymers,defects,order,orientation,zone annealing|
|Research Areas:||Thin-Films, Polymers|
|PDF version:||Click here to retrieve PDF version of paper (569KB)|