Physical-Mechanical Properties of Nitrodopes Affected by Ultra-Violet Radiation

Abstract

The FTIR spectroscopy has been employed in this research work to monitor the process of nitrodope photodegradation, by measuring surfaces of bands typical of a nitro group. Nitric esters are subject to degradation, which is reflected on a quantitative ratio of the surfaces of the IR bands that originate from the nitric ester. The obtained results show that the length of the UV rays' activity on the samples over the time periods of 240, 480 and 960 minutes directly affects the spectrum appearance of the same sample before and after the irradiation. The longer the action time of the UV rays and the higher a mass percentage of nitrocellulose in the nitrodope is, the smaller the bands' surfaces become, i.e. the level of degradation is higher. In order to confirm the degradation of nitrodope, the degree of crosslinking has also been examined by determining the König hardness and also the mean viscosity molar mass has been defined repeatedly applying the capillary viscosimetry method.

Influence of Environmentally Relevant Physicochemical Conditions on a Highly Efficient Inorganic Ice Nucleating Particle

“…However, when samples were aged with NO 2 in the presence of UV A (1 h), the ice nucleation ability decreased rapidly (MFTs of HgKaFe and KaFe were −9.4 and −9.9 °C, respectively). NO and O · are formed due to UV irradiation . O · has a tendency to react with molecular oxygen to form O 3 . And as reported by Cakić et al Yet, after aging with NO 2 under UV A, we found that the ice nucleation efficiency significantly decreased for HgKaFe and KaFe (in comparison to dark aging).…”

“…as reported by Cakićet al 63 Yet, after aging with NO 2 under UV A, we found that the ice nucleation efficiency significantly decreased for HgKaFe and KaFe (in comparison to dark aging). Therefore, the produced O 3 , O, • or NO likely changed the nucleating surface, resulting in poor ice nucleating particles.…”

“…NO and O • are formed due to UV irradiation. 63 O • has a tendency to react with molecular oxygen to form O 3 .…”

Spray‐flame synthesis of La(Fe, Co)O3 nano‐perovskites from metal nitrates

“…The ATR‐FTIR spectra of all solutions consisting of a nitrate and ethanol show a weak band at 1,660 cm −1 (Figures a,b and a,b). We assume that this band indicates the interaction between ethanol and the NO 3 − group as this weak band has been associated with the formation of nitrate esters . These compounds are explosive and might play a role as low‐temperature initiators in the microexplosions of droplets containing nitrates.…”