Bulk microphase segregation of an asymmetric organometallic-inorganic diblock copolymer: a remarkable example of concentric cylinders.
We report that an asymmetric diblock copolymer, poly(ferrocenyldimethylsilane-b-dimethylsiloxane) (PFS90-b-PDMS900, PDI = 1.01, volume fraction PFS = 0.20), self-assembles in the bulk state to form a hexagonal periodic structure with a remarkable morphology. Part of the major component forms the core of concentric cylinders with a mean diameter of 35.5 nm surrounded by a 7 nm thick shell of PFS. The remaining PDMS fills the interstitial spaces. The morphology was elucidated by small-angle X-ray scattering, as well as by scanning and conventional transmission electron microscopy.
Raez
Jose
J
Department of Chemistry, University of Toronto, 80 St. George Street, Ontario, Canada M5S 3H6.
Zhang
Yuanming
Y
Cao
Lan
L
Petrov
Srebri
S
Erlacher
Kurt
K
Wiesner
Ulrich
U
Manners
Ian
I
Winnik
Mitchell A
MA