Extrinsic fluorescence as a sensitive method for studying photo-degradation of high density polyethylene correlated with mechanical stresses

Douminge, L.; Feaugas, X.; Bernard, J.; Mallarino, S.

doi:10.1016/j.cap.2013.06.027

Cited by 4 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the standard deviation, the tensile strength property after 24 h in the ozone chamber did not show significant variations, all samples having values greater than 90%. In the tensile strength test, during elongation, the molecular and sulfur chains linked to the elastomer, not broken by aging, slide over each other, becoming more oriented and making it difficult to break [41] .…”

Section: Ozone Agingmentioning

confidence: 99%

Evaluation of lignin as stabilizer in vulcanized natural rubber formulations

et al. 2022

View full text Add to dashboard Cite

In this study we evaluated the use of eucalyptus lignin as a stabilizer in combination with other stabilizers in a vulcanized elastomeric based on natural rubber. The stabilizers tested were 6PPD (N-1,3-dimethyl-butyl-N'-phenyl-pphenylenediamine), TMQ (oligomerized 2,2,4-trimethylquinoline), paraffin wax and eucalyptus lignin. At predetermined time intervals, samples were taken from aging conditions and the mechanical properties and additive content were determined. The sample with a combination of wax and lignin in the same formulation showed the greatest resistance to oxidative degradation. In samples with only one stabilizer, the migration test indicated greater diffusion of lignin to the surface. Samples exposed to thermo-oxidative aging showed greater loss in the mechanical properties of tear strength and 6PPD consumption. In the accelerated aging with ozone, all showed a behavior more resistant to aging. We concluded that lignin can be used as a substitute for synthetic stabilizers, without impairing the performance of natural rubber compounds.

show abstract

Section: Ozone Agingmentioning

confidence: 99%

Evaluation of lignin as stabilizer in vulcanized natural rubber formulations

et al. 2022

View full text Add to dashboard Cite

show abstract

“…For these specimens, probably the cross-linking formation, as well as chain scission, occurred in the highest proportion than in the ozone chamber. According to Douminge et al 32 , the competition among sulfur bonds and chain scission during degradation lead to physical modifications of the macromolecular chains. These modifications may be associated with a decrease of mechanical properties (as tear resistance, stress and elongation at break) when exposed to photochemical aging.…”

Section: Photochemical Aging In Uv Chambermentioning

confidence: 99%

“…The consumption of 6PPD was gradual, reaching 80% and is related to the reduction of mechanical properties. The aging mechanism in this scenario is caused by temperature 32 . The stress and elongation at break of aged specimens were reduced by thermal aging 33 and the phenomenon can be attributed to the scission of poly and disulfide bonds and the formation of additional monosulfide bonds.…”

Section: Thermo-oxidative Aging In Ovenmentioning

confidence: 99%

Evaluation of Stabilizing Additives Content in the Mechanical Properties of Elastomeric Compositions Subject to Environmental and Accelerated Aging

et al. 2020

View full text Add to dashboard Cite

This research aimed to evaluate the ideal proportion of two stabilizers in elastomeric compositions indicated for tire sidewall. The stabilizers applied in different proportions were N-1,3-dimethyl-butyl-N'-phenyl-p-phenylenediamine (6PPD) and oligomerized 2,2,4-trimethyl-quinoline (TMQ). Nine compositions were prepared with 0.5, 1.5 and 2.5 phr of 6PPD combined with 0.5, 1.0 and 1.5 phr of TMQ. The compounds were exposed to accelerated aging processes, including thermo-oxidative, photochemical and ozone chamber. Also, the samples were aged in the environment for 440 days. At regular intervals, the samples were evaluated. Gas chromatography was used to quantify the content of 6PPD. Overall, the samples exposed to thermo-oxidative aging showed the greatest loss of mechanical properties (tear and tensile strength) as well as the 6PPD content. From the mechanical strength results, it was possible to conclude that the best combination of stabilizers was 2.5 phr of 6PPD and 1.0 of TMQ.

show abstract

“…However, quantifying surface cracking was indirect and not entirely satisfactory, being based on a correlation between carbonyl index (a spectroscopic quantity) and the degree of cracking. Extrinsic fluorescence techniques using Rhodamine dye, recently used for the first time to study microstructural changes in polymers during UV degradation, 58,59 hold more promise for quantification of weathering-induced microcracking of plastics.…”

Section: Emerging Issue Of Weathering and Microplasticsmentioning

confidence: 99%

Consequences of stratospheric ozone depletion and climate change on the use of materials

Andrady

Torikai²,

Redhwi

et al. 2014

Photochem Photobiol Sci

View full text Add to dashboard Cite

Materials used in the exterior of buildings and in construction are routinely exposed to solar UV radiation. Especially in the case of wood and plastic building materials, the service life is determined by their weather-induced deterioration. Any further increase in ground-level solar UV radiation, UV-B radiation in particular, will therefore reduce the outdoor service life of these products. Any increase in ambient temperature due to climate change will also have the same effect. However, the existing light-stabilizer technologies are likely to be able to mitigate the additional damaging effects due to increased solar UV radiation and maintain the outdoor lifetimes of these materials at the present levels. These mitigation choices invariably increase the lifetime cost of these products. A reliable estimate of what this additional cost might be for different products is not available at the present time. Personal exposure to UV radiation is reduced both by clothing fabrics and glass windows used in buildings and automobiles. This assessment describes how the recent technical advances in degradation and stabilization techniques impact the lifetimes of plastics and wood products routinely exposed to solar UV radiation and the protection to humans offered by materials against solar UV radiation.

show abstract

Extrinsic fluorescence as a sensitive method for studying photo-degradation of high density polyethylene correlated with mechanical stresses

Cited by 4 publications

References 34 publications

Evaluation of lignin as stabilizer in vulcanized natural rubber formulations

Evaluation of lignin as stabilizer in vulcanized natural rubber formulations

Evaluation of Stabilizing Additives Content in the Mechanical Properties of Elastomeric Compositions Subject to Environmental and Accelerated Aging

Consequences of stratospheric ozone depletion and climate change on the use of materials

Contact Info

Product

Resources

About