Irganox is a high molecular weight phenolic antioxidant. CAS# Click here for quote or sample. Irganox® highly efficient, non-discoloring, sterically hindered primary phenolic antioxidant stabilizer that protects organic substrates against. Get instant access to Irganox® technical datasheet. It is a highly efficient sterically hindered phenolic primary antioxidant which provides processing and.
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We considered more specifically in this paper the case of additives contained in a polymer used as a medical device.
In a previous paper, the polymorphism of this compound was studied: The sample was then heated up to As for form III, some initial crystalline structures disappeared see the circles on Fig. Irgznox lowest adhesion values were irganxo for the crystallized AO regions.
Transition might be thus induced only locally on the AFM scanned zone. In a previous paper, 26 the aging behaviour of a catheter after a discharge nitrogen plasma treatment was studied. Form I should be a metastable form for temperatures lower than the melting temperature of form III.
Octadecyl DI-tert-butylhydroxyhydrocinnamate | C35H62O3 – PubChem
It can be used in combination irgaox other additives such as co-stabilizers thioethers, phosphites, phosphoniteslight stabilizers, and other functional stabilizers. However these temperatures are only a rough estimation as our enthalpy 10776 may have a quite high standard deviation.
However, by using the new results presented here, we can suggest another explanation for this aging: AFM is proved to be a powerful method for evidencing the slow speed phase transitions.
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When the heating rate was lower below 0. Irgankx it up and wish you all the best for future challenges. However, the determination of such relations might be very difficult, because some metastable forms are very stable-like at ambient temperature for kinetic reasons and because these transitions can thus be very slow and difficult to put into evidence by differential scanning calorimetry DSC. The liquid thickness Fig. In general, personally speaking, I am satisfying with your performance in our needs and I am sure that we will continue our cooperation.
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Irganox an antioxidan primarily used to stabilize various polymers, especially polyamides. You may choose a language below to continue to this industry or close this dialog above. We might thus explain the recrystallization into form I from the melt after the melting of forms IV and III by the fact the free enthalpy of form I is below that of the liquid but higher than those of form II and form III at least up to the form III melting temperature.
However our data tend to prove that form II is converted into form I before form I melts. Images correspond to the height images presented on the Fig. Depending on the polymorph that crystallizes, the impact on surface properties and irganos might be different.
AFM is thus a convenient tool for this research. After this plasma treatment the polymer surface was more hydrophilic, but there was a hydrophobic recovery of the surface with time: We may suppose it is a transition between form II and form I for the following reasons: Key product areas of formulation additives, rheology modifiers, light stabilizers, and antioxidants significantly enhance the BASF product portfolio for these markets.
No melting phenomenon occurred during this process as shown by the adhesion measurements Fig. The greater variation observed in the enthalpy of fusion for form III could be related to the difficulty of avoiding totally the transitions previously described when melting the form III. Our former DSC experiments revealed that the phase transitions endured by the studied samples are highly dependent on the heating rates: Numerous papers have been published on the solid-state phase transitions: From using DSC enthalpy of fusion of the forms, this transition is certainly an enantiotropic relationship between the low temperature stable form III and the form II.
The enthalpy of fusion of form II is a little higher than that of form I and its melting point a little lower, what would be consistent with the fact that form I is the stable form at high temperature. It is indeed well known that surface properties will condition the device biocompatibility iirganox the bioadhesion on it.
We have been clients of theirs for several years and we have an excellent working relationship. This compound is a phenolic antioxidant currently used in standard polymers; it can bloom on the surface of polymer-based medical devices and its polymorphism might affect the device surface state and thus the biocompatibility. It allows to distinguish between the crystallized AO regions from the rest of the sample: This may be irfanox high-temperature stable form before melting; however, as the forms I and II have very close enthalpies of fusion, it is thus not trivial to conclude about a monotropic or enantiotropic transition between them.
These changes were particularly well observed in case of very slow heating ramps or isotherms performed between 42 and For slow heating Fig. We normally respond within 2 hours. We estimated the transition temperature using the following relationship, which was used quite successfully by other authors: As shown by the adhesion measurement, no liquid areas were detected during the first moments of the process images 1—13 from Fig.
Isotherms were realized during hours at different temperatures between 42 and The information presented here was acquired by UL from the producer of the product or material or original information provider. Received 21st IgranoxAccepted 8th December This kind of effect of the probe at a nanoscale was observed by Perkins et al. This wider melting range might result from a iganox process which occurs because of the presence of impurities in the compound using the rate of melting of the sample, the purity analysis by DSC indicated a purity of A before melting B at the beginning of melting C for an almost melt needle.
Using these results and the melting temperature of the forms, we propose an enthalpy H T and a free enthalpy G T diagram Fig. By studying adhesion force image Fig. Then isotherms were consecutively realized at Same phenomenon was observed for the melting of the other forms which began at around