March 2010 Meeting Announcement, Delaware Valley Mass Spectrometry Discussion Group
- Topic: "Characterization of Low-Molecular-Weight Polymers by Mass Spectrometry
- Speaker: William J. Simonsick, Jr., DuPont Chemicals and Fluoroproducts
- Date: Monday, March 8, 2010. 6:30 PM
- Time: Social Hour: 6:30 PM.
Talk: 7:30 PM.
Please RSVP to Bill Simonsick firstname.lastname@example.org by Thursday March 4th.
- Place: Department of Chemistry, Villanova University (Room 102, Mendel Hall)
Polymers possessing molecular weight distributions under 10K daltons are an important class of materials that are commonly used as precursors to more complex polymeric architectures such as block-, comb- or graft-copolymers. Moreover, these low-molecular-weight polymers can be formulated with a small amount of organic solvent to prepare environmentally compliant high performance automotive coatings or in the construction of nano-materials. Mass spectrometry (MS) has earned respect and gained prominence in the area of macromolecular characterization due primarily to soft ionization methods in which molecular weight data are preserved. For polymers with molecular weights under 10K daltons we employ CO2 laser desorption or electrospray ionization MS as our soft ionization methods. The direct MS data provides the molecular weight distribution, the chemical composition of all polymer chains and end groups. Gel permeation chromatography (GPC) is coupled online to MS through an electrospray ionization interface to size separate and thus simplify the compounds entering the mass spectrometer. GPC/MS used in parallel with refractive index or UV/Vis liquid chromatographic detectors yields accurate molecular weight information for different polymer architectures. Tandem MS studies performed on polymer molecular ions provide information about the specific sequence and functionality location. Applications of direct MS, GPC/MS and tandem MS techniques to polyesters, acrylics and polyethers will be presented.
Dr. William J. Simonsick, Jr. is a principle investigator with the Chemicals and Fluorochemicals business of DuPont. Bill received his Ph.D. in analytical/environmental chemistry in 1985 from Indiana University, Bloomington, Indiana, and his B.S. from Seton Hall University, South Orange, New Jersey in 1981. His current research interests include environmentally friendly refrigerants, polymer characterization using soft ionization techniques in mass spectrometry and pyrolysis methods. Bill has also coupled powerful separation techniques (gel permeation chromatography/supercritical fluid extraction/chromatography) with mass spectrometry for polymer characterization. Bill holds one patent and has over one hundred and twenty peer-reviewed publications in these areas.
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