The most widely used method for the determination of polymer molecular weight and molecular weight distribution.
Gel Permeation Chromatography (GPC)
Wednesday, November 3rd, 2010Liquid Chromatography Mass Spectroscopy – Quadrapole Time Of Flight (QTOF)
Wednesday, September 1st, 2010QTOF LCMS is one of the most advanced identification methods available. Identifications are based upon retention time, accurate mass to four decimal places and MS/MS fragmentation patterns.
X-Ray Diffraction
Friday, July 30th, 2010XRD is often used for phase identification or for determination of the percent crystallinity. A material must be crystalline for XRD.
Ultra Violet (UV-Vis) Spectroscopy
Friday, July 30th, 2010UV-Vis spectroscopy determines the absorption spectrum for the sample in the UV and visible wavelength region.
Transmission Light Microscopy
Friday, July 30th, 2010This technique is best for samples which are partially transparent or for the observation of fine powders. Digital images of the sample are captured allowing the determination of object size. This method is appropriate for objects down to one micron in size.
Titrimetry
Friday, July 30th, 2010This is a quantitative method generally applied to determine the concentration of an acid or base. Other typical examples include the determination of the hydroxyl content.
Tensile Strength Testing
Friday, July 30th, 2010Measures the force required to break a specimen (ultimate strength) and the extent of elongation of the specimen at the break point. Data includes a stress-strain diagram related to the tensile modulus of the test specimen.
Transmission Electron Microscopy
Friday, July 30th, 2010TEM is one of the highest resolution imaging methods allowing sub nanometer resolution. It is required that the material be transparent to electrons or that it be particulate. TEM is appropriate for the analysis of nanometer sized objects.
Solution Viscosity
Friday, July 30th, 2010Relative Viscosity is the ratio of the viscosity of the solution to the viscosity of the solvent. This is a frequently used quality control measure in the polymer industry to indicate molecular weight.
Specific Gravity
Friday, July 30th, 2010The ratio of the density of a substance to the density of water under spefied conditions. This measurement can be performed on solids or liquids.
