The “knitting pattern” morphology was obtained via blending of two polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock copolymers. This demonstrates that blending of block copolymers is a useful way to design periodic superstructures by taking advantage of the self-assembling nature of microphase separated block copolymers.
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Goldacker et al. (1999) studied this question.