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Polymer Characterization Facility

Facility Director
Professor Craig Hawker
 
Training
Users of the MRL Synthesis and Characterization Laboratory are required to go through two levels of training before they are authorized to perform data collection independently. The training consists of
  • General lab safety training, provided by the UCSB Environmental Health & Safety Department (EH&S).
  • Instrument training, conducted by development engineer or an authorized user delegated by the development engineer.

Instruments

  1. Dynamic Light Scattering - DynaPro NanoStar »
    Campus Gov't/Academic Industry

    Dynamic Light Scattering (DLS) measures time dependence of light scattering intensity change. The Stokes-Einstein relation (1) allows us to calculate the hydrodynamic radius Rh (lower limit ~ 0.5 nm and upper limit ~ 500 nm) from the translational diffusion constant Dt. The solvent dynamic viscosity and temperature must be known. Rh depends only on the physical size and size-related behavior (diffusion, viscosity) of the molecule. Information about concentration or refractive index increment is not necessary for a DLS experiment.

  2. Gas Chromatograph (GC) »
    Campus Gov't/Academic Industry

    The gas chromatograph (GC) makes possible to separate the volatile components of a very small sample and to determine the amount of each component present. A gas chromatograph consists of a flowing mobile phase, an injection port, a separation column containing stationary phase, a detector, and a data recording system. GCs are very sensitive instruments. Typically samples of one µL or less are injected on the column.

  3. Gel Permeation Chromatography (GPC) with Multi-Angle Light Scattering Detection (MALS) »
    Campus Gov't/Academic Industry

    GPC separates molecules on the basis of hydrodynamic size (not Mw). The large molecules move more rapidly through the GPC column, and in this way the mixture can be separated. The elution volume of a molecule is related to its hydrodynamic volume. To relate the elution volume to the molecular weight of a polymer, a calibration with molecular weight standards is needed. Molecular weight measurement with light scattering is an absolute method. Using MALS as a detector results in the measurement of absolute molecular weight which is independent from the column calibration.

  4. Gel Permeation Chromatography 1 (GPC 1) »
    Campus Gov't/Academic Industry

    The sample management system in the Waters 2690 Separation Module uses five carousels with total capacity of 120 vials. A carrier rotates the carousels to the injection station in the sample compartment. Our GPC is employing the 2414 Refractive Index Detector.

  5. Gel Permeation Chromatography 2 (GPC 2) »
    Campus Gov't/Academic Industry

    The sample management system in the Waters 2695 Separation Module uses five carousels with total capacity of 120 vials. A carrier rotates the carousels to the injection station in the sample compartment. Our GPC is employing the two primary detectors: 2414 Refractive Index Detector and 2996 Photodiode Array (PDA) Detector.

  6. Microwave Reactor 1 - Biotage »
    Campus Gov't/Academic Industry

    Microwave irradiation is electromagnetic irradiation in the frequency range of 0.3 to 300 GHz. All domestic “kitchen” microwave ovens and all dedicated microwave reactors for chemical synthesis operate at a frequency of 2.45 GHz (which corresponds to wavelength of 12.24 cm) to avoid interference with telecommunication and cellular phone frequencies. The energy of the microwave photon in this frequency region (0.0016 eV) is too low to break chemical bonds and is also lower that the energy of Brownian motion. It is therefore clear that microwave cannot induce chemical reactions (O. C.

  7. Microwave Reactor 2 - CEM Discover S »
    Campus Gov't/Academic Industry

    Microwave energy began to be applied to organic chemistry reactions in the mid 1980s. Microwave irradiation is electromagnetic irradiation in the frequency range of 0.3 to 300 GHz. All domestic "kitchen" microwave ovens and all dedicated microwave reactors for chemical synthesis operate at a frequency of 2.45 GHz (which corresponds to wavelength of 12.24 cm) to avoid interference with telecommunication and cellular phone frequencies.

  8. Modulated Differential Scanning Calorimeter (MDSC*) Q2000 »
    Campus Gov't/Academic Industry

    Conventional DSC is an analytical technique in which the difference in heat flow between a sample and an inert reference is measured as a function time and temperature as both the sample and reference are subjected to a controlled environment of time, temperature, atmosphere and pressure. In conventional DSC, the temperature regime seen by sample and reference is linear heating or cooling at rates from as fast as 200 0° C/min to rates as slow as 0 ° C/min (isothermal).

  9. Preparative Gel Permeation Chromatography (Prep GPC) »
    Campus Gov't/Academic Industry

    Gel permeation chromatography (GPC) is an established separation method for the determination of molecular weight averages (Mn) and molecular weight distributions (PDI = Mw/Mn) of polymers. The importance of analytical aspect of GPC is well documented in the literature however little effort has been made to extend the use of this important technique for the fractionation of polymer samples on a preparative scale.

  10. Rheometer I (with water bath) »
    Campus Gov't/Academic Industry

    Rheology has been properly defined as the study of the flow and deformation of materials. The relationship between stress and deformation is a property of the material. We can therefore define Rheology as the study of stress-deformation relationships.

  11. Rheometer II (with oven) »
    Campus Gov't/Academic Industry

    Rheology has been properly defined as the study of the flow and deformation of materials. The relationship between stress and deformation is a property of the material. We can therefore define Rheology as the study of stress-deformation relationships.