Polymers Subcommittee Agenda and Minutes
March 22, 2006
Chairman: Thomas Blanton
The Polymer Subcommittee has not met in several years. Therefore, there were no previous minutes to approve.
In 2000, the Polymer Subcommittee was established to pursue the idea of a PDF-3 polymer database. PDF-4+ 2005 has 895 polymer hits. Diffractometer data from 9 samples were collected from polymers and submitted to ICDD. John Faber created a database to evaluate data.
It should be pretty easy to get digitized data from external publications. We can probably buy software that can digitize data from journals. We would look for 1D data and 2D data.
The following list of significant polymers was put together several years ago, but has not been updated since the last meeting of this subcommittee. (See PDF - Polymers)
A practical example would be material deposited on filter paper. A PDF-3 polymer database would help identify the diffraction pattern due to the filter paper.
In an attempt to determine the direction this subcommittee should take, many questions were asked:
Where do we go? Is such a product in demand? Should we pursue a polymer database or some type of PDF-3 database? Should it be pursued in terms of a Jane Turley type book on computer with the image available? Or should it be taken a step further to whole pattern fitting? Should a polymer product be a plug-in to the PDF and not a separate database? Would it be useful for some polymers to be in their common oriented state?
While it was determined that whole pattern fitting would most likely not be useful, a list of constructive features was gathered.
- Generate a pattern to view would be useful.
- Random and oriented patterns
- Commercially available items – June Turley's patterns were from unoriented samples. Useful patterns would be oriented Teflon and Saran wrap.
- Note how the sample was made so that it is obvious to the user. This is needed to make the database useful.
- Molecular weight effect
An ICDD Polymer Subcommittee meeting will be held at the 2007 Denver X-ray Conference in conjunction with Randy Barton's Polymer Session which normally attracts 40-60 attendees. The ICDD should plan to participate in and/or organize a workshop. Samples of polymer patterns should be available and will require some involvement from Headquarters.
The need for this Subcommittee will be reevaluated after this 2007 meeting.