Properties and chemiluminescence of polypropylene stored for a long period
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Cited by (36)
Development of an automatic evaluation system for photooxidation and assessment of polyethylenes containing HALS and UVA
2024, Polymer Degradation and StabilityChemiluminescence studies on the photooxidation of isotactic polypropylene
2021, Polymer Degradation and StabilityCitation Excerpt :Since the pioneering study by Ashby [1] in 1961 on the thermal oxidation of polypropylene (PP), CL induced by various external causes other than heat, such as UV light [2-4], γ-irradiation [5], mechanical stress [6,7], and electric field [8,9], has been studied, and at the same time, newly devised CL apparatuses, such as CL imaging [7,10-12] and multi-sample detection systems to accelerate the evaluation efficiency [13,14], have been developed. Considering the application of CL to polyolefins, which are the most widely used plastics, studies on the photoinduced CL have been gradually increasing during the last 10 years, but they are still less than many studies on CL accompanied by a thermal oxidation of polyolefins [15-23]. However, considering the recent environmental issues on a plastic sea garbage and an industrial subject such as the sterilization by UV light, significance of the study on the durability against photodegradation seems to be largely increasing.
Structure elucidation of photoluminescent degradation products from polyolefins and evaluation of stabilizer formulations
2015, Polymer Degradation and StabilityCitation Excerpt :In contrast to other polymer aging characterization methods such as infrared (IR) spectroscopy, differential scanning calorimetry (DSC) [6] or tensile testing [7], photoluminescence spectroscopy is the only method showing aging induced changes within the induction period of the polymer degradation process. Thus, photoluminescence spectroscopy has turned out to be the method of choice when studying polyolefin degradation at the initial stage of the aging process [8–11]. Although one would not expect highly pure hydrocarbons like polypropylene and polyethylene (PE) to absorb light in the ultra-violet or visible spectrum, photoluminescence emissions are nevertheless observed [8–10,12–19].
Natural antioxidants for polypropylene stabilization
2011, Polymer Degradation and StabilityCitation Excerpt :Several carbonyl compounds are produced during oxidative degradation of polypropylene, namely ketones, esters, lactones, carboxylic acids, and the CL intensity is proportional to the accumulation of carbonyl species formed [33]. It is worth noticing that the signal of PP0 was the most intense (Fig. 2), as an indirect sign of a superior concentration of carbonyl species within the material [34]. On the other hand, polypropylene retained higher average molar mass in presence of the natural additives, as evidenced by less intense CL emission of the doped samples.
<sup>60</sup>Co γ-ray irradiation effect and degradation behaviors of a carbon nanotube and poly(ethylene-co-vinyl acetate) nanocomposites
2008, Polymer Degradation and StabilityCitation Excerpt :Decomposition of hydroperoxide into carbonyl and water However, degradation of a polymer is caused by the autoxidation reaction that occurs successively by the radical reactions around oxygen [12,13]. Once radicals are created, the number of oxides such as the alkyl radical (R), peroxy radical (RO2) and hydroperoxide (ROOH) slowly increase to expedite the degradation reaction.
New approach to understanding chemiluminescence from the decomposition of peroxidic structures in polypropylene
2000, Polymer Degradation and Stability