Molecularly asymmetric triblock copolymers as a single-molecule route to ordered bidisperse polymer brushes |
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Authors: | Smith Steven D Hamersky Mark W Bowman Michelle K Rasmussen Kim Ø Spontak Richard J |
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Institution: | Miami Valley Innovation Center, Procter & Gamble Company, Cincinnati, OH 45061, USA. |
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Abstract: | The conditions signaling the formation of bidisperse brushes in ordered block copolymers are investigated as an A(2) block is progressively grown onto an A(1)B diblock copolymer to form a series of molecularly asymmetric, isomorphic A(1)BA(2) triblock copolymers. Small-angle scattering and self-consistent field theory confirm that the microphase-ordered period decreases when the A(2) block is short relative to the A(1) block, but then increases as A(1)+A(2) bidisperse brushes develop. The mechanical properties systematically follow the spatial distribution of the A(2) block. |
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