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 T-x increased, the PEO or PLLA lamellar crystal thickness d(L) increased as well as the reduced tethering density (σ) over tilde of the PS chains. The onset of tethered PS chains overcrowding in solution occurs at (σ) over tilde*similar to3.7-3.8 as evidenced by an abrupt change in the slope between (d(L))(-1) and T-x. This results from the extra surface free energy created by the tethered chain that starts to affect the growth barrier of the crystalline blocks.
Physical Review Letters
Required Publisher's Statement
Copyright 2004 American Physical Society. The original published version of this article may be found at http://dx.doi.org/10.1103/PhysRevLett.93.028301.
Chen, William Y.; Zheng, Joseph X.; Cheng, Stephen Z. D.; Li, Christopher Y.; Huang, Ping; Xiong, Huiming; Ge, Qing; Guo, Ya; Quirk, Roderic P.; Lotz, Bernard; Deng, Lingfeng; Wu, Chi; and Thomas, Edwin L., "Onset of Tethered Chain Overcrowding" (2004). College of Polymer Science and Polymer Engineering. 16.