We proposed an approach to precisely control the density of tethered chains on solid substrates using PEO-b-PS and PLLA-b-PS. As the crystallization temperature increased, the PEO or PLLA lamellar crystal thickness increased as well as the reduced tethering density of the PS chains. The onset of tethered PS chains overcrowding in solution occurs at as evidenced by an abrupt change in the slope between and . This results from the extra surface free energy created by the tethered chain that starts to affect the growth barrier of the crystalline blocks.
- Received 3 October 2003
©2004 American Physical Society