Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles

Bichler, Karin J.; Jakobi, Bruno; Huber, Stefan O.; Gilbert, Elliot P.; Schneider, Gerald J.

doi:10.1021/acs.macromol.9b01598

Title: Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles

Journal Article · 16 December 2019 · Macromolecules

DOI: https://doi.org/10.1021/acs.macromol.9b01598 · OSTI ID:1605743

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^[1]; Gilbert, Elliot P. ^[2];

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Louisiana State Univ., Baton Rouge, LA (United States)
Australian Centre for Neutron Scattering, NSW (Australia)

We have used anionic polymerization to synthesize polymers of linear and bottlebrush architecture each with a polydimethylsiloxane backbone. The blending of polymer architectures has the effect of changing material properties, e.g., the viscoelasticity, which are connected to the chain conformation. Hence, we investigate the conformation of bottlebrush polymers in a linear host melt both as a function of the concentration and for various molecular weights of the linear host matrices. Our bottlebrush polymers are seen as shell-only particles with a negligible core size. We find a substantial influence of the molecular weight of the linear matrices on the structure of the bottlebrushes and their interactions. In samples with a low molecular weight matrix that have the same degree of polymerization as the side chains, the bottlebrush behavior is consistent with an effective theta solvent condition for all concentrations. With increasing molecular weight of the host matrix, this condition is only reached at the highest concentration of the bottlebrush polymers. The increase of the molecular weight of the host matrix leads to a shrinkage of the bottlebrushes and subsequently to a formation of clusters at higher volume fractions. None of the scattering patterns show a pronounced correlation peak; yet, decreased forward scattering associated with a structure factor effect is observed.

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Research Organization:: Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University, Baton Rouge, LA, United States

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Contributing Organization:: U.S. Department of Energy (DoE) under EPSCoR Grant No. DE-SC0012432 ANSTO for access to the QUOKKA SANS instrument through proposal grant P6515 and FRMII for access to the KWSII SANS instrument.

Grant/Contract Number:: SC0012432; SC0019050

OSTI ID:: 1605743

Alternate ID(s):: OSTI ID: 1677408; OSTI ID: 1773791; OSTI ID: 2271664

Journal Information:: Macromolecules, Vol. 53, Issue 1; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 11 works

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Title: Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles

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