The influence of carbon black on properties of oriented polypropylene 3. Thermal degradation under applied stress

How to Measure Polymer Degradation? An Analysis of Authors' Choices When Calculating the Carbonyl Index

“…The predominance of indoor degradation experiments (Figure b) is due to the need for better and more reliable assessment under accelerated and controlled conditions in a shorter period. ,,− These experiments provide experimental data to indicate optimal parameters for the best adjustment of products and processes that delay degradation and increase lifespan, improving recycling conditions and formulation. ,,− On the other hand, exposition to the weather in outdoor degradation experiments allows better prediction of how properties change as a function of degradation time in realistic conditions, although the experiments take longer. While indoor experimental conditions provide essential information and predictions regarding the behavior of materials under such controlled experimental conditions, laboratory experimental tests do not encompass all conditions of a true-to-life environment.…”

Food-Package-Processing relationships in emerging technologies: Ultrasound effects on polyamide multilayer packaging in contact with different food simulants

“…The increase in the overall crystallinity of the Fatty/60min samples may be associated with the formation of large crystal clusters, as suggested for BOPPAc/PVDC films (Ščetar et al, 2019). This behavior may be due to the stress of acoustic cavitation on the surface of the material, i.e., due to the high energy release of the bubbles (Price et al, 1995;Ščetar et al, 2019), leading to possible changes in the crystalline regions resulting from chain breaks followed by secondary recrystallization (Miraftab et al, 2002;Roy et al, 2006;Ščetar et al, 2019). Lastly, this behavior may have been intensified by a possible absorption of organic compounds from the fatty simulant (ethanol) in the PA layer (Tsochatzis et al, 2020) and, consequently, structural changes of the material (Heimrich et al, 2015;Stoffers* et al, 2005).…”