Structure evolution of α- and β-polypropylenes upon UV irradiation: A multiscale comparison

Improved thermal oxidation stability of polypropylene films in the presence of β-nucleating agent

“…The fraction of β-phase (f β ) in β-PP film shows a similar trend during the thermal-oxidative aging. In contrast, a non-monotonic dependence of the crystallinity value on the aging time was reported by Obadal et al[23] and Wang et al…”

“…Yoshii et al [22] found that the radiation stability of PP with β-NA became worse than that without β-NA, which was attributed to the higher proportion of crystal boundaries present in the nucleated PP. Obadal et al [23,24] suggested that higher UV-light scattering and absorbance of β-PP was responsible for its higher oxidative stability compared to the neat PP. However, to our knowledge, few studies about the effect of β-NA on the thermal oxidation of PP films have been reported so far.…”

The Effect of Encapsulation of Nano Zinc Oxide with Silica on the UV Resistance of Polypropylene

“…Severe molecular chain degradation in PP can be induced when it is irradiated within the wavelength range of UV light [1][2][3] . A number of researches have been focused on the mechanism of UV-induced degradations in PP [4][5][6][7][8][9][10] .…”

The Role and Potential of Vibrational Spectroscopy in the Study and Characterization of Traditional and Novel Food Packaging Structures

“…In the case of a set of polypropylene (PP) samples, the embrittlement time by UV radiation was defined as the time in hours to achieve a CI of 0.06. 18 Thus, molecular degradation could be characterized by the CI, 18 which was calculated by the equation:…”