Molecular weight analyzer. (Instruments).The BI-MwA molecular weight analyzer is a light scattering instrument that is said to be uniquely adapted to real-time monitoring of processes occurring in polymer solutions. The BI-MwA is comprised of a flow-through, seven-angle, static light scattering Static light scattering is a technique in physical chemistry that uses the intensity traces at a number of angles to derive information about the radius of gyration  , molecular mass device with special features and software that allow the user to monitor polymerization polymerizationAny process in which monomers combine chemically to produce a polymer. The monomer molecules—which in the polymer usually number from at least 100 to many thousands—may or may not all be the same. as it occurs, plotting molecular weight, radius of gyration Radius of gyration A relation of the area or mass of a figure to its moment of inertia. If I is the moment of inertia about a line of a figure whose area is A, the figure's radius of gyration with respect to that line is. and conversion as a function of time, according to the company. During polymerization, a binary or gradient pump is used to dilute small amounts from the reactor. The diluted sample flows through concentration detectors (UV and RI) to determine the amount of monomer and polymer. A simple, single-capillary viscometer viscometer Instrument for measuring the viscosity (resistance to internal flow) of a fluid. In one type, the time taken for a given volume of fluid to flow through an opening is recorded. is added to monitor reduced viscosity and provide an estimate of intrinsic viscosity. (Brookhaven Instruments, 750 Blue Point Rd, Holtsville, NY 11742) Circle 82 on card |
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