Depolarized Scattering from Block Copolymer Grains Using Circularly Polarized Light

Xin Wang, Xiuhong Li, Whitney Loo, Maurice C. Newstein, Nitash P. Balsara, Bruce A. Garetz

Research output: Research - peer-reviewArticle

Abstract

The grain structure of ordered block copolymer materials affects their viscoelastic, adhesive, optical, and electrical properties. Depolarized light scattering has proven to be an important method for characterizing this grain structure. In this paper, we use both theory and experiments to demonstrate the relationship between grain structure and depolarized light scattering from ordered block copolymer samples performed with crossed circular polarizers. We model the sample assuming it comprises randomly oriented ellipsoidal grains with optic axes coincident with the ellipsoid axes. We show that the scattering pattern obtained using circularly polarized (CP) light is azimuthally symmetric, in contrast to that obtained using linearly polarized (LP) light which exhibits 4-fold angular modulation. The integrated scattered power in the CP case is twice as large as that in the LP case. By simultaneously fitting CP and LP light scattering data, we obtain robust measures of parameters that characterize grain structures. In addition, CP light scattering can, in principle, be used to characterize nonrandom grain orientation distributions.

LanguageEnglish (US)
Pages5122-5131
Number of pages10
JournalMacromolecules
Volume50
Issue number13
DOIs
StatePublished - Jul 11 2017

Fingerprint

Crystal microstructure
Light polarization
Light scattering
Block copolymers
Scattering
Optics
Adhesives
Electric properties
Optical properties
Modulation
Experiments

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

Cite this

Wang, X., Li, X., Loo, W., Newstein, M. C., Balsara, N. P., & Garetz, B. A. (2017). Depolarized Scattering from Block Copolymer Grains Using Circularly Polarized Light. Macromolecules, 50(13), 5122-5131. DOI: 10.1021/acs.macromol.7b01048

Depolarized Scattering from Block Copolymer Grains Using Circularly Polarized Light. / Wang, Xin; Li, Xiuhong; Loo, Whitney; Newstein, Maurice C.; Balsara, Nitash P.; Garetz, Bruce A.

In: Macromolecules, Vol. 50, No. 13, 11.07.2017, p. 5122-5131.

Research output: Research - peer-reviewArticle

Wang, X, Li, X, Loo, W, Newstein, MC, Balsara, NP & Garetz, BA 2017, 'Depolarized Scattering from Block Copolymer Grains Using Circularly Polarized Light' Macromolecules, vol 50, no. 13, pp. 5122-5131. DOI: 10.1021/acs.macromol.7b01048
Wang X, Li X, Loo W, Newstein MC, Balsara NP, Garetz BA. Depolarized Scattering from Block Copolymer Grains Using Circularly Polarized Light. Macromolecules. 2017 Jul 11;50(13):5122-5131. Available from, DOI: 10.1021/acs.macromol.7b01048
Wang, Xin ; Li, Xiuhong ; Loo, Whitney ; Newstein, Maurice C. ; Balsara, Nitash P. ; Garetz, Bruce A./ Depolarized Scattering from Block Copolymer Grains Using Circularly Polarized Light. In: Macromolecules. 2017 ; Vol. 50, No. 13. pp. 5122-5131
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