Impact of stabilization additives on the controlled degradation of poly(propylene)

King, Roswell E.; Stadler, Urs

doi:10.1002/(sici)1522-9505(19981201)261-262:1<189::aid-apmc189>3.0.co;2-x

Cited by 19 publications

(2 citation statements)

References 7 publications

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Section: Resultscontrasting

confidence: 99%

“…Our findings contrast with earlier speculation in literature, which suggested for the purely statistical process a higher likelihood of long chains to cleave over short ones and a narrowing of the distribution. 29 However, while a single long chain is more likely to be cleaved over a short one, its most likely statistical cleavage event is not the "symmetrical" break-up. Our simulations are simply based on single cleavage events, and have no direct, easy relationship with the experimental time scale, integrated shear energy or radical propagation kinetics.…”

Section: Resultsmentioning

confidence: 99%

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Elucidating pathways of polypropylene chain cleavage and stabilization for multiple loop mechanical recycling

von Vacano,

Reich,

Huber

et al. 2023

Journal of Polymer Science

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Mechanical recycling is a decisive contribution for a sustainable circular economy of polypropylene (PP) but faces the challenge of processing‐induced and use‐phase accumulated molecular damage, exacerbated by multiple loop recycling. In this contribution, the molecular origin of degradation of PP under up to 30 repetitive reprocessing loops is analyzed together with the influence of stabilization, and processability data linked to changes of the entire molecular weight distribution. By comparison of experiments with simple Monte Carlo simulations, a coupled mechanism of random scission and shear‐induced cleavage can be inferred, while stabilizing additives effectively protect the material from progressing along this combined degradation pathway.

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Section: Resultscontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Elucidating pathways of polypropylene chain cleavage and stabilization for multiple loop mechanical recycling

von Vacano,

Reich,

Huber

et al. 2023

Journal of Polymer Science

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Thermoplastics and Thermosets

2009

Macromolecules

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Structure effect of benzofuranone on the anti‐oxidation kinetics in polypropylene

Cai

Meng

Shen

et al. 2010

Asia-Pacific J Chem Eng

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Benzofuranone compounds are used as chain-breaking antioxidants in the melt processing of polymers owing to their strong hydrogen donating ability. In this article, the structural effects of benzofuranone compounds on anti-oxidation in polypropylene (PP) were evaluated using oxidation onset temperature (OOT) of PP stabilised by the compounds in oxygen and the oxidation kinetics of the PP was studied using Ozawa and Kissinger methods, respectively. The results show that benzofuranone compounds inhibit the oxidative degradation of PP by increasing the oxidation activation energy, and the higher the oxidation activation energy of PP, the better the anti-oxidation activity of benzofuranone in PP. Furthermore, the anti-oxidation activity of benzofuranone compounds in PP is weakened by the methyl group in the 2 -position. Compared to benzofuranone compounds OXBF1 and TBF1 without 2 -position methyl group, PP stabilised by benzofuranone compound MXBF1 with 2 -position methyl group has lower OOT values and smaller oxidation activation energy. 

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Impact of stabilization additives on the controlled degradation of poly(propylene)

Cited by 19 publications

References 7 publications

Elucidating pathways of polypropylene chain cleavage and stabilization for multiple loop mechanical recycling

Elucidating pathways of polypropylene chain cleavage and stabilization for multiple loop mechanical recycling

Thermoplastics and Thermosets

Structure effect of benzofuranone on the anti‐oxidation kinetics in polypropylene

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