German China

Germany: Refractive Index & Viscometry Detector How a New Dual Detector Enables Sensitive Determination of Molecular Weight Distribution

Editor: Alexander Stark

Testa Analytical Solutions reports the development and OEM supply of a novel combination refractive index / viscometry detector for Brookhaven Instruments Corporation (Holtsville, USA), a supplier of scientific instruments for solving challenging macromolecular characterisation problems.

Related Company

Testa Analytical has created a range of high-performance GPC/SEC detectors.
Testa Analytical has created a range of high-performance GPC/SEC detectors.
(Source: Testa Analytical)

Berlin/Germany — Polymer and plastics manufacturers offer very many different grades of commodity polymers such as poly(vinyl chloride), polyethylenes and polystyrenes. The Molecular Weight Distribution (MWD) of such polymers is a key item of information in tailoring their implementation for different end uses.

Brookhaven Instruments selected Testa Analytical Solutions to develop a combination detector. The Brookhaven Instruments BI-RIVS is a combination RI and Viscometry detector used in SEC/GPC determination of polymer MWD using universal calibration. The BI-RIVS is a true dual-detector, refractometer and viscometer. The refractometer is an integral component of the viscometer bridge, measurement of concentration and viscosity take place on the exact same sample segment, at the very same time. Compared to the more common “external” connection of the two detectors, the BI-RIVS Dual-Detector provides a factor of two to five higher sensitivity, near zero delay volume and unsurpassed overall performance.