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Consequences of low-χ design in block copolymer self-assembly

Chang, Alice and Grubbs, Robert H. (2017) Consequences of low-χ design in block copolymer self-assembly. In: 253rd American Chemical Society National Meeting & Exposition, April 2-6, 2017, San Francisco, CA.

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We performed the first systematic study of the phase behavior of ABC bottlebrush triblock terpolymers. Along the way, we discovered a new lamellar morphol. with unusual consequences for polymer properties and scaling behavior. We synthesized a series of ABC triblock terpolymers having grafted polylactide (L), polystyrene (S), and poly(ethylene oxide) (O) side chains. Partial mixing of L and O end blocks due to low-χ design produces a new morphol. (LAM_p) with mesoscopic ACBC connectivity, counter to all known examples for ABC triblock terpolymer self-assembly. For ABC triblock terpolymers, the std. model demands periodic domains with ABCB repeat units (i.e., LAM_3). In our system as designed, however, we can decouple the domain connectivity from the synthesized block connectivity. Other consequences of partial mixing in LAM_p include a dramatic decrease in domain spacing with increasing mol. wt. under certain conditions. LAM_p has been characterized by small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). SCF theory (SCFT) for brush polymers supports the exptl. model and affirms the importance of χ. Recently, we have extended these insights into low-χ design from ABC triblock terpolymers to polymer blends. To the best of our knowledge, these phenomena are unprecedented in block copolymer self-assembly. This discovery introduces a new tool for controlling polymer structure and properties in future materials design.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Chang, Alice0000-0001-5036-2681
Grubbs, Robert H.0000-0002-0057-7817
Additional Information:© 2017 American Chemical Society.
Record Number:CaltechAUTHORS:20170502-101123277
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77122
Deposited By: Tony Diaz
Deposited On:02 May 2017 17:56
Last Modified:09 Mar 2020 13:18

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