Viscotek

Viscotek Model 350 HTGPC
The modular Viscotek Model 350 HTGPC is a high-temperature (150°F) gel-permeation chromatography (GPC) system that features automated sample preparation and delivery, self-cleaning inline sample filtration and a detector module that is easily removed for routine maintenance. The unit can be configured with a refractive index (RI) detector and low angle/right angle laser light scatttering (LALS/RALS) detector to provide absolute molecular weight, molecular size and other critical information.

Vortex Autosampler
The Vortex autosampler consists of an integrated autosampling device and multi-stirrer, and is designed to increase ef- ficiency, enhance precision and promote operator safety. The temperature-controlled, heated (up to 150°C) multistirrer assembly features a stainless-steel tray capable of handling both 20-mL and 40- mL vials. Each vial position has its own magnetic stirring mechanism that delivers consistent and reproducible stirring action from vial-to-vial and eliminates variability due to the dissolution process. When coupled with the firm’s Triple Detector Array (TDA) or Relative Viscometer, the Vortex provides a complete, automated system for macromolecular characterization and determination of solution viscosities.

OmniSEC 4.1 GPC/SEC integrated software package
The OmniSEC 4.1 GPC/SEC integrated software package for multiple detection analysis helps maximize the information and efficiency of size separation experiments. Version 4.1 has the ability to calculate molecular weight of a protein sample without knowing the differential index of refraction (dn/dc) or concentration, as well as flow-injection polymer-analysis style calculations. Other excellent features include variable dn/dc and the powerful report designer. It is 21CFR Part 11 compliant and increases the information available from GPC/SEC experiments through enhancements to calibration calculations, copolymer analysis, overlays, multiple peak detection and data acquisition. Users have the flexibility of fixed baseline or different baseline and limit settings for each channel, and several new options are available for constructing the baseline.

Tetra Detector Array
The Tetra Detector Array is ideal for the characterization of natural and synthetic polymers, biopolymers and proteins. It consists of a patent-pending Low-Angle Light-Scattering (LALS) detector, four capillary viscometer detectors, patent-pending refractometer and selectable wavelength UV/VIS. All the detectors, as well as the GPC columns, are contained within a heated oven compartment with temperature control to 80°C, which means the sample is not exposed to variations in temperature. The integration and unique, proprietary arrangement of detectors (UV-LS-RI-VISC) insures minimal inter-detector volumes and reduced band-broadening, as well as eliminates the dilution effect and viscometer breakthrough experienced when the RI is placed last in the series. In a single GPC/SEC experiment, absolute molecular weight, molecular size (to less than 1 nm), and intrinsic viscosity, as well as information on branching, conformation, aggregation and copolymer composition can be obtained.

Triple Detector gel-permeation chromatography/size-exclusion chromatography (GPC/SEC) system
Designed for macromolecular characterization, the Triple Detector gel-permeation chromatography/size-exclusion chromatography (GPC/SEC) system features an integrated triple detector array (TDA) comprised of a unique low-angle light-scattering (LALS) detector, four capillary viscometer detectors; a GPCmax pump, autosampler and degasser module; and OmniSEC software for multiple detection analysis and complete system control. In a single GPC/SEC experiment, this system can provide absolute molecular weight without the column calibration, extrapolations or corrections required by other techniques. It can also determine molecular size (to less than 1 nm), intrinsic viscosity, as well as information on structure, conformation, branching, aggregation and copolymer composition.

Automated Relative Viscometer (ARV) system
The Automated Relative Viscometer (ARV) system is configured for the determination of relative, intrinsic, inherent, specific and absolute viscosity, as well as molecular weight. It features a dual-capillary viscometer designed specifically to measure the viscosities of dilute polymer solutions, a vortex-integrated module that provides fully automated sample preparation and sample delivery.

Model 350 high-temperature gel permeation chromatography (HT-GPC)
The Model 350 high-temperature gel permeation chromatography (HT-GPC) system is specifically designed for the characterization of polyolefins and other synthetic polymers that are soluble only at elevated temperatures. It provides absolute molecular weight without extrapolation or correction, as well as molecular size (Rg and Rh to less than 1 nm) and intrinsic viscosity. It also gives information on branching, structure and aggregation in a single GPC/SEC (size exclusion chromatography) experiment. The system may be configured with an infrared (IR)detector for short-chain branching analysis or an ultra­violet/visible (UV/VIS) detector for copolymer compositional analysis. It is designed in a modular format and features automated sample preparation and delivery, self-cleaning inline sample filtration, and a detector module that is easily removed for routine maintenance.

gel-permeation chromatography (GPC) standards for natural and synthetic polymer applications
These gel-permeation chromatography (GPC) standards for natural and synthetic polymer applications provide pre-weighed, accurate portions, and are traceable to standards provided by the National Institute of Standards and Technology (NIST). Triple Detection Standards (TDS) consist of six sets of two standards each, one narrow and one broad. They calibrate detectors that are used in triple detection, such as light-scattering, viscometers, and refractometers. Universal Calibration Standards (UCS) consist of six sets of twelve individual narrow standards, each designed to be used for column calibrations, either conventional molecular weight (MW) calibration with a concentration detector, or universal calibration with a viscometer detector. The narrow standard is helpful in determining detector volume offsets and peak broadening errors; it is particularly useful for checking molecular weight density (MWD) and other molecular values. Each standard comes in its own vial, which eliminates resolution problems, and has pre-printed labels for lab notebooks.