Dislocation-controlled perforated layer phase in a PEO- b-PS diblock copolymer.
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;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.
Zhu
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L
Maurice Morton Institute and Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, USA.
Huang
P
P
Cheng
S Z
SZ
Ge
Q
Q
Quirk
R P
RP
Thomas
E L
EL
Lotz
B
B
Wittmann
J C
JC
Hsiao
B S
BS
Yeh
F
F
Liu
L
L