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Tetra Detector Array
A revolutionary, integrated multiple-detector device designed for the characterization of natural and synthetic polymers and copolymers, proteins, protein conjugates, excipients and other macromolecules. Comprised of modular Refractive Index, Ultra-Violet, Low Angle Light Scattering and Viscometer detectors.
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Product Brochures
Download product information from our extensive catalog of product literature.
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News USA:
Check out the latest USA News involving Viscotek.
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Application Notes
Our database of GPC/SEC application notes explain the use of concentration, viscometer and light scattering detectors to obtain a distribution of absolute molecular weight, size and intrinsic viscosity, as well as information on conformation, aggregation, branching and copolymer composition. |
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GPC: Columns |
Viscotek is setting a new standard in GPC technology with the introduction of a
series of highly specialized columns. The highly inert I-Series and G-Series columns
as well as the innovative C-Series and A-Series columns will offer
much needed flexibility in our increasingly complex separation challenges. We also
offer a highly rugged H-Series columns for High Temperature (HT) GPC applications.
GPC columns can be classified in several ways:
Solvent Classification and Polymer Type
● Organic Solvent and Polymer
■ HHR-Series Columns for non-polar polymers
■ I-Series Column for intermediate polar polymers
■ G-Series Column for highly polar polymers
● Aqueous Solvent and Polymer
■ PWXL-Series Columns for neutral polymers
■ C-Series for cationic polymers
■ A-Series for anionic polymers
Temperature Range
● Temperature up to 100°C
■ Many columns will work well at temperatures
up to about 100°C
● Higher Temperatures in 140-160°C range
■ Special columns are required for this range
in temperature
■ H-Series Columns which are high temperature
columns would be appropriate for these
temperatures that are used for polyolefin
analysis
Pore Size
● Traditional Pore Size
■ Packings were available only in narrow distributions
of pore sizes which would require large
sets of columns to affect a separation
of a broad molecular weight distribution polymer
● Mix Bed Columns Pore Size
■ Mixed bed columns are a broad pore size distribution
■ These generally give adequate separations for
a greater variety of polymer samples with fewer
number columns in the set.
Particle Size
● Smaller Particles
■ Smaller particles yield higher resolution but
there are limitations such as increased
backpressure, higher shear rate,
and sample capacity
Physical Length and Diameter of Column
The Sum of all these choices often results in a challenging array of column combinations.
The proper selection of a column set is a blend of science and art. It requires
knowledge of the polymers to be analyzed, both their chemistry and their expected
range of molecular weights. In addition, one should be familiar with various solvents
and their interaction with the polymer sample and with the column packings. Then
comes the daunting task of sorting through the many column types in order to find
the optimum set for your particular application.
Fortunately, Viscotek is a specialized supplier of GPC products – large macromolecule
analysis is one of our key areas of business -- and is able to simplify column selection and offer
assurance that the column set you purchase from us will work for the specified application.
Based on our many years of aggregate experience in GPC, we have pre-selected the
types of GPC columns that are most suitable for general GPC analysis so you don’t
have to sort through redundant options.
For more information, including full technical specifications, performance information and product details, please click below to download our extensive sixteen page brochure
outlining our full range of columns and standards.
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