Targeted Materials
Polymers
(PDF-2 Release 2016, PDF-4+ 2016, PDF-4/Organics 2017)


Chitin - polyglucosamine, PDF 00-065-0890

Polyglucosamine (L-poly-chitin), PDF 00-065-0890, raw data PD3 XRD pattern with d-spacing, intensity overlay (top) and simulated XRD two-dimensional ring pattern (bottom). Data provided by J. Deschamps, Naval Research Laboratory: Deschamps, J. “Characterization of chitin preparations using powder and film X-ray diffraction methods,” Powder Diffr. 28, 44 (2013).

New Capabilities: Crystallinity and crystallite size measurements
Polymers often can pose a challenge for XRPD investigations. Variations in macromolecule chain length, the occurrence of chain branching, and processing conditions often results in polymer materials that can be amorphous, semi-crystalline, highly crystalline, randomly oriented, or preferentially oriented. In commercial applications, many composites are comprised of a polymer base with inorganic or organic additives present. Inclusion of raw data XRPD patterns for polymers in the PDF database, starting in Release 2009, provides a more complete picture to help identify crystalline and amorphous components of a polymer XRPD pattern. The original discussion of including full pattern polymer data in the PDF began with an International Centre for Diffraction Data (ICDD) task group member. It is now a reality with 125 polymer raw data XRPD patterns in the PDF, focusing on high volume commercial polymers. This includes 24 new patterns added to the 2015 product line release.

 

New Polymers added to the 2016 Product Line

This includes 39 new patterns added to the 2016 product line release.


Technical Presentations on Polymers

Tutorial

How to analyze polymers using X-ray diffraction

ICDD Workshop EPDIC 14

"X-ray Diffraction Analysis of Polymers – Expanding Materials Characterization Capabilities" – T. N. Blanton, ICDD, Newtown Square, PA

Presentation PPXRD-13

"ICDD Powder Diffraction File coverage of polymers used in pharmaceutical and biomedical applications" – T. N. Blanton, S. Gates

Publications

"Reference materials for the study of polymorphism and crystallinity in cellulosics" - T. G. Fawcett, C. E. Crowder, S. N. Kabekkodu, F. Needham, J. A. Kaduk, T. N. Blanton, V. Petkov, E. Bucher and R. Shpanchenko

"A new “chain” of events: polymers in the Powder Diffraction File™ (PDF®)" - S. D. Gates, T. N. Blanton, and T. G. Fawcett

"Characterization of Nafion proton exchange membrane films using wide-angle X-ray diffraction" – T. N. Blanton, R. Koestner