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

We investigate the morphological evolution of two linear ABC triblock terpolymers, poly­(1,1-dimethyl­silacyclobutane-block-styrene-block-methyl methacrylate) (PDMSB-b-PS-b-PMMA or DSM) and poly­(1,1-dimethyl­silacyclobutane-block-styrene-block-lactide) (PDMSB-b-PS-b-PLA or DSL), in situ during solv...

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Bibliographic Details
Published in:Macromolecules 2019-02, Vol.52 (4), p.1853-1863
Main Authors: Lee, Sangho, Cheng, Li-Chen, Yager, Kevin G, Mumtaz, Muhammad, Aissou, Karim, Ross, Caroline A
Format: Article
Language:English
Subjects:
Chemical Sciences
NANOSCIENCE AND NANOTECHNOLOGY
Polymers
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Summary:We investigate the morphological evolution of two linear ABC triblock terpolymers, poly­(1,1-dimethyl­silacyclobutane-block-styrene-block-methyl methacrylate) (PDMSB-b-PS-b-PMMA or DSM) and poly­(1,1-dimethyl­silacyclobutane-block-styrene-block-lactide) (PDMSB-b-PS-b-PLA or DSL), in situ during solvent vapor annealing using grazing-incidence small-angle X-ray scattering. The morphology, orientation, and period of the microdomains are characterized under a continuous solvent vapor flow of CHCl3 as a function of swelling ratio and deswelling rate. The 90 nm thick films of DSM form in-plane core–shell cylinders, while DSL films of 150 nm thickness predominantly form out-of-plane core–shell cylinders within perforated lamellae oriented parallel to the substrate. 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.
ISSN:0024-9297
1520-5835
DOI:10.1021/acs.macromol.8b02273