The influence of light on the thermal decomposition of polypropylene fibers

Čunko, Ružica; Gambiroža-Jukić, Mirjana; Pezelj, Emira

doi:10.1002/(sici)1097-4628(19990328)71:13<2237::aid-app14>3.0.co;2-m

Cited by 3 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Carlsson and Wiles, 1969;Adams, 1970;Ahmed, 1982;Margolin, 1994;Cunko et al, 1999;Maria et al, 2000). The mechanisms proposed in the literature show that the formation of final products involves several parallel routes that probably interact (Delprat et al, 1995).…”

Section: Infrared Spectroscopic Analysis Of Photo-oxidation Mechanismmentioning

confidence: 99%

Prediction of outdoor weathering performance of polypropylene filaments by accelerated weathering tests

Yang

Ding

2006

Geotextiles and Geomembranes

View full text Add to dashboard Cite

Section: Infrared Spectroscopic Analysis Of Photo-oxidation Mechanismmentioning

confidence: 99%

Prediction of outdoor weathering performance of polypropylene filaments by accelerated weathering tests

Yang

Ding

2006

Geotextiles and Geomembranes

View full text Add to dashboard Cite

“…The investigation described in this paper is primarily aimed at determining the possibly detrimental influence of ozone on polypropylene (PP) fibers. These fibers are highly sensitive to atmospheric factors, especially ultraviolet rays [3,4,11 ], so the question arises whether (and if so, how much) the increased amount of ozone in the troposphere influences the problem of PP fiber ageing in atmospheric conditions. The literature on the subject indicates a lack of research on this topic, especially where fibers, as a specific form of the material, are concerned.…”

mentioning

confidence: 99%

Influence of Ozone as an Air Pollutant on Polypropylene Fiber Properties

Pezelj

Čunko

2000

Textile Research Journal

View full text Add to dashboard Cite

Ever increasing ozone concentrations in the earth's atmosphere polluted by photochemical smog raise the question of possible ageing of fibers in such an environment. This paper investigates polypropylene fibers characterized by pronounced ageing in the natural environment under the impact of sunlight. Fibers are exposed to ozone for varying times and temperatures in a concentration range that can be expected in a heavily polluted urban industrial environment. Changes in the level of chemical composition and molecular configuration are investigated, together with morphological characteristics and end-use properties. Results indicate that, even under relatively mild ozone conditions, hydroperoxide groups are created, morphological surface changes occur, fibers become more brittle and lose strength, and the isotacticity of the configuration is pronounced, but there are some rather positive effects as well. I The investigation described in this paper is primarily aimed at determining the possibly detrimental influence of ozone on polypropylene (PP) fibers. These fibers are highly sensitive to atmospheric factors, especially ultraviolet rays [3, 4, 11 ], so the question arises whether (and if so, how much) the increased amount of ozone in the troposphere influences the problem of PP fiber ageing in atmospheric conditions. The literature on the subject indicates a lack of research on this topic, especially where fibers, as a specific form of the material, are concerned.Oueslati et al. have made some interesting investigations of the impact of ozone on chemical and morphological changes in PP fibers [8, 9, 101, which were exposed to ozone concentrations of -4.5 x 106 pphm, a very intensive treatment. This amount of ozone is a few thousand times higher than the average concentrations in polluted environments registered for a number of years in various parts of the world (Los Angeles, California; Arkon, Germany; Basel, Switzerland; Sydney, Australia). All the concentrations registered were in the range between 1.5 and 4 pphm [ 12], while occasional peaks of pollution reached-115 pphm (Los Angeles) or -75 pphm (Zurich). Using IR-and ESR spectroscopy, the authors investigated chemical changes in PP macromolecules [9, 10], and with electronic microscopy, they showed what this level of &dquo;ozonization&dquo; does to the core/sheath structure of PP fibers [8]. Similar morphological changes were also observed by Catoire et al.[2] at somewhat milder, but still highly intensive, ozone treatments (3.1 x 105 pphm).The literature does not offer proof of the impact of ozone on other relevant physicomechanical properties of the fibers, which is important for assessing ageing during use in real conditions of air pollution with ozone. For this reason, our investigation deals with ozone concentrations slightly higher than peak values in polluted urban environments. We focus on end-use properties, but we also consider other relevant properties for a complete overview of the problem.. MethodologyAll the tests involved undyed PP filaments...

show abstract