Enhancing nucleation and controlling crystal orientation by rubbing/scratching the surface of a thin polymer film |
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Authors: | K Jradi S Bistac M Schmitt A Schmatulla and G Reiter |
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Institution: | 1.COBM - ENSCMu,Mulhouse cedex,France;2.Physikalisches Institut,Universit?t Freiburg,Freiburg,Germany |
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Abstract: | We used the tip of an atomic force microscope (AFM) in the contact mode to scratch/rub the surface of a glassy polymer thin
film, i.e., isotactic polystyrene (i-PS) at room temperature. After subsequent isothermal crystallization, an extremely high nucleation
density of edge-on crystals within the rubbed region or at the edge of the scratched area was observed. Furthermore, a transition
from edge-on to flat-on lamellae occurred beyond a certain distance from the edge of the scratched region. Our results demonstrate
that both, soft rubbing or hard scratching, allow to lower the nucleation barrier for polymer crystallization and to control
the orientation of the resulting crystalline lamellae. The role of scratching/rubbing on chain deformation and its relation
to nucleation and crystal orientation in polymer thin films is discussed. |
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Keywords: | |
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