Non-invasive headspace measurement for characterizing oxygen-scavenging in polymers

Oxidative behavior of (+)‐catechin in the presence of inactive dry yeasts: a comparison with sulfur dioxide, ascorbic acid and glutathione

“…Oxygen molecules create a decrease in the fluorescence lifetime that is proportional to their concentration (dynamic quenching). An infrared sensor located in the reader pen of the fluorimeter allows simultaneous measurement of the sample temperature . The instrument is managed by specific software (OxySense Inc.) that facilitates immediate measurement of oxygen concentration in mg L −1 .…”

Modeling of oxygen scavenging for improved barrier behavior: Blend films

“…A simple mass balance relates the time profile of the un-reacted core radius to the ROC d dt polymer 4 a 3 3 = − ROČ polymer (11) whereˇtakes into account the capacity of the particle to consume oxygen when fully oxidized; this parameter is defined as the moles of oxygen consumed per unit volume of OSP and can be determined by experimentally measuring the mass uptake of the OSP alone [39,40]. Combining Eqs.…”

“…Since the fully oxidized material is hard and glassy, one could expect S p to be similar to S m . Efforts are underway currently to evaluate S p , D p and k from oxygen uptake experiments like those recently published [39,40]; an analysis of such data will be the subject of a forthcoming publication. For now, Table 1 includes some preliminary estimates of the ranges of D p and k from this type of analysis.…”

“…Here we simplify this process by applying a "shrinking core" approximation to the oxygen uptake of the OSP particles. Experimental techniques and results for quantifying the oxygen consumption by films of butadienecontaining polymers initiated as part of this program have recently been described [39,40].…”

Fast Oxygen Scavenging of Macroporous Poly(Norbornadiene) Prepared by Ring‐Opening Metathesis Polymerization

“…The spots were read out through the transparent wall of the tube with a Firesting O 2 (PyroScience GmbH) phase fluorometer keeping the temperature constant at about 23 °C. The quantification of the oxygen's partial pressure was done similar to a published method10 based on the response of the phosphorescence lifetime of the sensor on pO 2 . Results are shown in Figure 2b,c.…”