Flow‐injection polymer analysis of styrenic block copolymers. II

Abstract

A flow-injection polymer analysis (FIPA) method for the dilute solution characterization of unsaturated styrenic block copolymers was developed. The method is rapid, works with both butadiene and isoprene comonomers, and covers a range of 0 -100% styrene content in the polymer. Solutions of the polymer were introduced into a flowing mobile phase and monitored by an array of three close-coupled detectors: a right-angle laser light-scattering unit, a differential refractive index detector (DRI), and a differential pressure viscometer. In addition, a separate, dual-detector instrument was set up specifically to evaluate the styrene content by the FIPA method. In that case, the detectors were a DRI and an ultraviolet detector. Within an analysis time of a few minutes, information on molecular weight, molecular size, and comonomer composition could be obtained directly. The data were compared to those obtained from a preexisting gel permeation chromatography analysis method.

Flow‐injection polymer analysis of ethylene propylene diene monomer elastomers. I

“…II. 6 The specific refractive index increments dn/dc were measured using the calibrated DRI detector of the TDA. For the measurements in CH at 70°C, a 50K g/mol polystyrene standard, assigned a dn/dc value of 0.172 mL/g, was used to calibrate the detector.…”

Highly Stereo‐ and Regioselective Hydrostannylation of Internal Alkynes Promoted by Simple Boric Acid in Air

“…For a discussion of precision, see the companion study, Flow‐Injection Polymer Analysis (FIPA) of Styrenic Block Copolymers. II 6…”

Flow Injection Analysis of Polymeric Excipients Used in Pharmaceutical Formulations

“…In recent years, flow injection SEC methods have been applied where it is necessary to make a rapid measurement of polymer properties, for example, in materials discovery where large numbers of samples need to be screened, or in process monitoring where an at-line measurement in near real time is required. [4] This article will illustrate two examples of flow injection SEC analysis applied to two polymer systems, one of which utilizes the advantages of real-time monitoring of polymer properties and a second example where high throughput analysis of a large numbers of samples is required.…”