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The 305th SPring-8 Seminar

Subject/Contents Polarized resonant soft X-ray scattering for nanoscale molecular orientation measurements in polymers
Period from 10:30 to 11:30 Thu., Mar 23 , 2023
Venue Online /Zoom
Host/Organizer JASRI
Format Lecture

Speaker: Dean M. DeLongchamp

Language: English

Affiliation: Material Measurement Laboratory, National Institute of Standards and Technology (NIST)

Title: Polarized resonant soft X-ray scattering for nanoscale molecular orientation measurements in polymers

Orientation and conformation in nanoscale amorphous regions often dominate the properties of polymeric materials. Robust correlations between structure in these amorphous regions and important properties are not well developed due to a lack of measurements with high spatial resolution and a sensitivity to molecular orientation. I will describe our approach to solving this issue using polarized resonant soft X-ray scattering (P-RSoXS), which combines principles of soft X-ray spectroscopy, small-angle scattering, and data fusion with real-space imaging to produce a molecular scale structure measurement for soft materials.

I will focus on recent results from polarized resonant soft X-ray scattering (P-RSoXS) measurements of semicrystalline polymers, nanocomposites, and block copolymers. Our analysis approach extracts molecular orientation details with a spatial resolution of ≈ 2 nm or smaller. This work is now accelerated by a powerful software code base using parallel computation across graphics processing units (GPUs) for the forward-simulation of P-RSoXS patterns. Our approaches now include data fusion with real space measurements such as atomic force microscopy and transmission electron microscopy, as well as direct fitting of experimental P-RSoXS data with simulation results, enabling the extraction of quantitative nanoscale orientation landscapes describing never-before-measured radial chain orientation distributions near interfaces in glassy regions of polymer-grafted nanocomposites and block copolymers. These new P- RSoXS capabilities show great promise for informing and guiding the processing and synthetic design of soft materials.

Organizer:Japan Synchrotron Radiation Research Institute (JASRI)
Center for Synchrotron Radiation Research Industrial Application and Partnership Division
Ito Kanae
e-mail:kanaeatspring8.or.jp/PHS: 3628

Contact Address SPring-8 Seminar secretariat Minako Koujibata General Administration Division/SPring-8/Japan Synchrotron Radiation Research Institute (JASRI)
Last modified 2023-02-14 15:51