The chemical structural changes during aging were analyzed with a Fourier transform infrared (FTIR) spectrometer (Nicolet iN 10MX, Thermo Scientific, Waltham, MA USA). The change of the polymer chains’ arrangement in the sample during ageing could be shown in the process of melting and the oxidative-induced reaction. In order to characterize the effect of aging on the melting and oxidative-induced action of samples, differential scanning calorimeter (DSC) tests were carried out at different aging stages (DSC 882e, Mettler-Toledo Inc., Greifensee, Switzerland). The sample weight of about 10 mg was used for dynamic oxidative induction. To remove the air, nitrogen was injected into the chamber for 5 min before heating, and then heated in pure oxygen at the heating rate of 10 °C/min. The staring of decomposition temperature of EVA is about 350 °C, so the temperature range of DSC measurements was from 50 °C to 350 °C.
Dsc 882e
Manufactured by Mettler Toledo
Sourced in Switzerland
The DSC 882e is a differential scanning calorimeter (DSC) instrument manufactured by Mettler Toledo. It is designed to measure the thermal properties of materials, such as melting points, glass transitions, and other phase changes. The DSC 882e provides precise and accurate thermal analysis data to support research and development activities in various industries.
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Lab products found in correlation
5 protocols using dsc 882e
1
Aging Effects on EVA Polymer Composition
2
Thermal Analysis of Mixed Lipid Nanotubes
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The vacuum-dried self-assembled solids (3–5 mg) of pure and mixed lipids were recorded on a METTLER TOLEDO DSC882e to obtain DSC thermograms in a nitrogen atmosphere at a heating rate of 5 °C min–1 from 35 to 135 °C. For thermal analysis of the mechanical mixture of 18D and 16L nanotubes (18D = 16L), the dried solids of respectively pre-self-assembled 18D nanotubes (2.17 mg) and 16L nanotubes (1.98 mg) were directly added into the sample pan and measurements were performed under the same conditions as described above.
3
Determining Glass Transition Temperature
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The Tg was determined using a DSC 882e (Mettler Toledo GmbH, Greifensee, Switzerland) differential scanning calorimetry (DSC). Specimens of 14 ± 3 mg of the composite were deposited in 40 μL aluminum crucibles with a 50 µm hole in the lid and were tested from 0 to 250 °C at a rate of 20 °C/min. Two different specimens were used, and two scans were performed on each specimen: the first one was to eliminate any absorbed moisture and erase the thermal history, and the second scan was to measure the Tg. The purge gas used was nitrogen, supplied at a rate of 50 mL/min. The Tg was determined as the midpoint of the transition from the baseline to the extrapolated tangent of the transition. STARe software (version 12.10, Mettler Toledo GmbH, Greifensee, Switzerland) was used for data analysis.
4
Differential Scanning Calorimetry Analysis of Polymerization
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Once the sample was prepared, approx. 25–30 mg of the sample was placed in an aluminum crucible with a capacity of 40 µL and a 50 µm hole in the lid. DSC 882e Mettler Toledo (Greifensee, Switzerland) was used to complete scans from 20 to 250 °C at three different rates (i.e., 5, 10 and 20 °C/min). Nitrogen was used as the purge gas and was delivered at a rate of 80 mL/min. Each scan was carried out at least three times.
Activation energy (Ea) of the polymerization process was evaluated by model free kinetic (MFK) method, applied with STARe Software (Mettler Toledo, Greifensee, Switzerland). Firstly, conversion degree (α) was calculated from each of the obtained curves at the three different rates. From these values, Ea was calculated as a function of α. It is important to highlight that activation energy calculated by MFK method changes with the extent of the polymerization. Therefore, it is possible to distinguish between the different stages of the polymerization reaction, as previously found by Paz et al. [21 (link)]. The model used by STARe Software is based on the work of Vyazovkin et al. [35 (link)].
Activation energy (Ea) of the polymerization process was evaluated by model free kinetic (MFK) method, applied with STARe Software (Mettler Toledo, Greifensee, Switzerland). Firstly, conversion degree (α) was calculated from each of the obtained curves at the three different rates. From these values, Ea was calculated as a function of α. It is important to highlight that activation energy calculated by MFK method changes with the extent of the polymerization. Therefore, it is possible to distinguish between the different stages of the polymerization reaction, as previously found by Paz et al. [21 (link)]. The model used by STARe Software is based on the work of Vyazovkin et al. [35 (link)].
5
Thermal and UV Polymerization of Resin
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The extent of the polymerization reaction of the resin and the effect of nanofiller incorporation was determined using DSC, which was measured using DSC 882e Mettler Toledo (Greifensee, Switzerland). The Formlabs Clear resin can cure through two different mechanisms (or a combination of both): (i) Thermal polymerization – by the application of temperature and (ii) UV polymerization – by the application of UV light at 405 nm wavelength. To determine the effect of nanofiller incorporation on these mechanisms, two different DSC tests were performed: (i) Complete thermal polymerization energy of the samples was determined (without UV polymerization), and (ii) degree of UV polymerization was studied by subjecting the sample to different exposure times and completing the cure by thermal energy.
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