Power Tool Absolute Macromolecular Characterization Systems
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TOP making excuses and start making absolute measurements of polymer weight, size, shape, and degree of branching for polymers from hundreds to millions of daltons in mass. We've made absolute results rapid, accessible, easy and affordable with our DAWN" light scattering detector systems. Coupled to your existing GPC/SEC chromatograph—or used off line —they'll determine absolute molecular weight without resorting to inappropriate assumptions like column calibrations that use unrelated standards, so called "universal constants", or other notorious fudge factors. Our non-light scattering competitors claim that they can measure "true" molecular weights. The truth is that they use complicated and questionable chains of reasoning, empirical approximations of limited validity and calibrations with standards! We'd say that's hardly absolute! The light scattered by all molecules is directly proportional to the molecular mass. The angular dependence of the scattered light is absolutely proportional to the molecular mean square size. Period! Hence, we never need to
do column calibration, assume hydrodynamic equivalents or any other gobbledygook. Our DAWN instruments have no lenses, mirrors, or prisms that could become misaligned, damaged, or dirty. We have no stepper motors, swing arms, immersion baths, or "folded optics". We do have an elegant instrument design driven by software that's unbelievably powerful and easy-to-use. Combined, they do wonders for your precision, decrease errors, and give you time to perform experiments you once thought were too tedious. With our Wyatt/Optilab Interferometric Refractometer you can determine the specific refractive index increment, dn/dc, of a sample in minutes. And because the 903 only requires calibration once, and has cells to optimize sensitivity over a huge dynamic range, it is also an RI detector with unmatched versatility. Call us at (805) 9635904 for a complete information package. It won't take us long to show you how much more information you can get, and how much time you can save. After all, in our business, assumptions aren't required...but power tools are!
Call today for more information and your FREE full-color brochure: (805) 963-5904
Wyatt Technology CORPORATION 802 E. Cota St • Santa Barbara, CA 93103 Tel: (805) 963-5904 • Fax: (805) 965-4898
1991 Wyatt Technology Corporation
Please visit us at IBEX, FACSS or ALEX in October I CIRCLE 150 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 63, NO. 18, SEPTEMBER 15, 1991 • 873 A
