Small angle x-ray analyses show that the shear-induced hexagonal perforated layer phase in a poly(ethylene oxide)-b-polystyrene diblock copolymer consists of trigonal (R3(overbar)m) twins and a hexagonal (P6(3)/mmc) structure, with trigonal twins being majority components. Transmission electron microscopy reveals that the hexagonal structure is generated through sequential intrinsic stacking faults on the second layer from a previous edge dislocation line, while the trigonal twins are formed by successive intrinsic stacking faults on neighboring layers due to the plastic deformation under mechanical shear.
Physical Review Letters
Required Publisher's Statement
Copyright 2001 American Physical Society. The original published version of this article may be found at http://dx.doi.org/10.1103/PhysRevLett.86.6030.
Zhu, Lei; Huang, Ping; Cheng, Stephen Z. D.; Ge, Qing; Quirk, Roderic P.; Thomas, Edwin L.; Lotz, Bernard; Wittmann, Jean-Claude; Hsiao, Benjamin S.; Yeh, Fengji; and Liu, Lizhi, "Dislocation-Controlled Perforated Layer Phase in a Peo-B-Ps Diblock Copolymer" (2001). College of Polymer Science and Polymer Engineering. 14.