We present the autophobic dewetting behavior of polymer melt droplets on chemically identical brushes. The polymer model layers were set to define the interface between polystyrenes (PSs) and corresponding brushes having variable chain lengths (or molecular weights), and then thermally annealed above the glass transition temperature. Autophobic dewetting of polymer melts in a dry brush regime was characterized by well-defined PS melt droplets that dewetted the brushes upon thermal annealing. The contact angle (θ) of PS droplets on the brushes and interfacial tension (γm/b) between the PS melts and brushes significantly increased as the chain length of PS brushes decreased and grafting density increased. We speculated that the γm/b increasingly converges on the maximum interfacial tension (γm/b∗) at the extremely short and dense PS brush, indicating the super autophobicity of the PS melt on the corresponding brush.
Bibliographical noteFunding Information:
This work was supported by the NRF grants (2014R1A2A2A01004364), Nuclear R&D Programs, and APCPI ERC (2007-0056091) funded by the Ministry of Science, ICT & Future Planning (MSIP), Korea.
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Materials Chemistry