Material Characterization | GE ResearchThere are many techniques that can be employed in the characterization of synthetic homopolymers, but few provide as useful of information for end group analysis as matrix-assisted laser desorption ionization time of flight mass spectrometry MALDI-TOF MS. Critical parameters during sample preparation include the selection of the matrix, identification of an appropriate cationization salt, and tuning the relative proportions of the matrix, cation, and analyte. The acquisition parameters, such as mode linear or reflector , polarization positive or negative , acceleration voltage, and delay time, are also important. Given some knowledge of the chemistry involved to synthesize the polymer and optimizing both the data acquisition parameters and the sample preparation conditions, spectra should be obtained with sufficient resolution and mass accuracy to enable the unambiguous determination of the end groups of most homopolymers masses below 10, in addition to the repeat unit mass and the overall molecular weight distribution. Though demonstrated on a limited set of polymers, these general techniques are applicable to a much wider range of synthetic polymers for determining mass distributions, though end group determination is only possible for homopolymers with narrow dispersity. With improvements in living polymerization techniques, precision polymers with quantitatively functionalized end groups are increasingly available 1.
What is POLYMER CHARACTERIZATION? What does POLYMER CHARACTERIZATION mean?
Molecular Characterization and Analysis of Polymers
A polymer may be defined as a chainlike molecule consisting of a large number of relatively simple structural repeating units. There is no fixed lower limit defining the number of repeat units for a molecule to be regarded as polymeric. Generally the repeat units are held together by covalent chemical bonds in the form of linear or branched open-chain molecules or three-dimensional networks. Unable to display preview. Download preview PDF.
Chalmers and Robert J. Mark and B. Written by expert contributors from the academic and industrial sectors, this book presents traditional and modern approaches to polymer characterization and analysis. The emphasis is on pragmatics, problem solving and property determination; real-world applications provide a context for key concepts. The characterizations focus on organic polymer and polymer product microstructure and composition.
Tailored Synthesis and Characterization of Complex Polymers Nanomechanical Thermal Analysis of Polymers Using Silicon.
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