Formation of spindlelike aggregates and flowerlike arrays of polystyrene-b-poly(acrylic acid) micelles
writer：Gao, LC; Shi, LQ; An, YL; 等.
keywords：block copolymers
source：期刊
specific source：LANGMUIR
Issue time：2004年
pubs.acs.org/doi/abs/10.1021/la0358116
In this letter we describe a simple physical method for the ordered aggregation of scattered single spherical polystyrene-b-poly(acrylic acid) (PS-b-PAA) micelles. First, narrow dispersed spindlelike aggregates, about 60 nm in diameter and 1.5 μm in length, are obtained from the aggregation of single spherical PS-b-PAA micelles at 0 °C on a glass slide. Then, the yielding spindlelike units can further aggregate into long-ranged, close-packed, flowerlike arrays after a given amount of freeze−thaw cycles. The formation of the interesting arrays is ascribed to the templated aggregation of micelles on the water polycrystal at the freezing point.