In Situ Study of ABC Triblock Terpolymer Self-Assembly under Solvent Vapor Annealing

ORAL

Abstract

The morphological transition of core-shell cylinder-forming triblock terpolymers during solvent vapor annealing is monitored in situ using grazing-incidence small-angle X-ray scattering. We investigate the self-assembly behavior of two linear ABC triblock terpolymers, poly(1,1-dimethyl silacyclobutane-block-styrene-block-methyl methacrylate) (PDMSB-b-PS-b-PMMA or DSM) and poly(1,1-dimethyl silacyclobutane-block-styrene-block-lactide) (PDMSB-b-PS-b-PLA or DSL). The morphology, orientation, and period of the microdomains are characterized under a continuous vapor flow of CHCl3 as a function of deswelling rate and swelling ratio. Films of DSM form in-plane core-shell cylinders, while DSL films predominantly form vertically oriented core-shell cylinders. A reversible order-order phase transformation between spheres and cylinders and a reorientation from in-plane to out-of-plane cylinders occur during the annealing process.

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Presenters

  • Sangho Lee

    Materials Science and Engineering, Massachusetts Institute of Technology

Authors

  • Sangho Lee

    Materials Science and Engineering, Massachusetts Institute of Technology

  • Li-Chen Cheng

    Massachusetts Institute of Technology, Materials Science and Engineering, Massachusetts Institute of Technology

  • Kevin G. Yager

    Brookhaven National Laboratory, Center for Functional Nanomaterials, Brookhaven National Laboratory, Brookhaven National Lab

  • Muhammad Mumtaz

    Laboratoire de Chimie des Polymères Organiques, CNRS – ENSCPB – Université de Bordeaux

  • Karim Aissou

    Laboratoire de Chimie des Polymères Organiques, University of Bordeaux, Laboratoire de Chimie des Polymères Organiques, CNRS – ENSCPB – Université de Bordeaux

  • Caroline Anne Ross

    Massachusetts Institute of Technology, Department of Materials Science and Engineering, Massachusetts Institute of Technology, MIT, Materials Science and Engineering, Massachusetts Institute of Technology