Effects of bismuth vandate and anthraquinone dye on the photodegradation of polycarbonate

Saron, Clodoaldo; Felisberti, Maria I.; Zulli, Fabio; Giordano, Marco

doi:10.1590/s0103-50532007000500005

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…The increase of the pigment concentration produces a progressive quenching of polycarbonate fluorescence. Comparative analysis with others colorants, such as Cu‐phthalocyanine dye,11 bismuth vanadate pigment and anthraquinone dye,20 showed a more pronounced decrease in fluorescence quantum yield for polycarbonate in presence of red diazo pigment. This result suggests that the red diazo pigment acts as an internal filter.…”

Section: Resultsmentioning

confidence: 93%

Influence of diazo pigment on polycarbonate photodegradation

Saron

Felisberti

Zulli

et al. 2007

J of Applied Polymer Sci

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The photostability of polymeric systems can be extensively affected by the presence of dyes and pigments. Achromatic pigments such as carbon black are known as effective stabilizers for polymers, while pigments such as those based on metals oxides may accelerate photodegradation in polymers. Despite innumerous studies addressed to achromatic pigments, the effects and action mechanisms of chromatic pigments on polymer stability are not well established. In this work, an effective photostabilizer action on polycarbonate was verified by the incorporation of a red diazo type condensation pigment. This pigment was incorporated into polycarbonate in an extruder at a concentration of 1 wt %. Injection molded specimens of this material were submitted to photochemical aging following the recommendations of ASTM G-53. The nonaged and aged specimens were characterized by mechanical testing, infrared spectroscopy, UV/visible absorption and fluorescence spectroscopies, and electron spin resonance. The absorption of the UV radiation by the pigment and subsequent quenching by the internal conversion energy process is the probable stabilization mechanism involved in this polymeric system.

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Section: Resultsmentioning

confidence: 93%

Influence of diazo pigment on polycarbonate photodegradation

Saron

Felisberti

Zulli

et al. 2007

J of Applied Polymer Sci

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“…However, the photooxidation of the varnish may occur inducing the fatigue of the UV-absorbers [12,13] . Consequently, the ability of the surface layer to totally absorb the incident near-UV light is reduced and a loss of adhesion of the coating occurs; a significant decrease of the durability of the substrate is then observed [14] ;…”

Section: Introductionmentioning

confidence: 99%

Improved durability of Bisphenol A polycarbonate by bilayer ceramic nano-coatings alumina-zinc oxide

et al. 2020

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Polycarbonate exposed to sunlight yellows, degrades and loses its usable properties. In order to increase its lifetime, it can be coated with nano-ceramic thin layers of ZnO and Al 2 O 3 deposited by sputtering. The role of the ZnO is to absorb the UV photons that can damageable for the polycarbonate. However, one of the limitations in the use of ZnO is the photocatalytic oxidation that could occur at interface ZnO/PC as a consequence of the photocatalytic activity of this oxide. Insertion of Al 2 O 3 between PC and ZnO could be a way to inhibit this interfacial oxidation. The photooxidation of the ceramic/polymer assemblies, in condition of artificial accelerated ageing, was measured by infra-red and UV-vis spectroscopies. The results show that the photocatalytic activity of ZnO occurring in monolayer coated substrates can be significantly reduced by insertion of Al 2 O 3 and that, in addition, Al 2 O 3 decreases the permeability to oxygen of the coating.

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“…Few articles have dealt with the influence of reinforcing fillers such as carbon black and nano‐clay on the thermal aging of elastomer composites. In many cases, dyes and pigments can also have a marked influence on the thermal and photochemical stability of the polymer material . Ionic liquids have found use in polymers as plasticizers, antistatic additives and have been used to enhance the ionic conductivity and the mechanical and thermal properties of the polymer composites, as well as to improve the filler dispersion (e.g., carbon nanotubes, carbon black, or silica) in hydrophobic matrices.…”

Section: Introductionmentioning

confidence: 99%

Study on Weather Aging of Nitrile Rubber Composites Containing Imidazolium Ionic Liquids

Marzec

Laskowska

Boiteux

et al. 2014

Macromolecular Symposia

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International audienceWeather aging of nitrile rubber composites containing hydrophilic 1-ethyl-3-methylimidazolium thiocyanate (EMIM SCN) and hydrophobic 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM TFSI), and 1-allyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (AMIM TFSI) ionic liquids was investigated. The mechanical properties at small (dynamic mechanical analysis) and high deformation (tensile test), the hardness and the electrical properties were measured before and after the aging process. It was found that the presence of hydrophobic ionic liquids in the nitrile rubber enhanced the retention of their mechanical properties (tensile strength, stiffness) and slightly reduced surface defects (as determined by scanning electron microscopy), thereby retarding the aging of rubber composites. However, the presence of hydrophilic EMIM SCN in the composite accelerated the degradation of the studied materials because of its high crosslinking activity during the aging process. The electrical studies showed also lower stability of hydrophilic ionic liquid (EMIM SCN) in the studied nitrile matrix (leaking effects) compared to the hydrophobic one (EMIM TFSI, AMIM TFSI)

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Effects of bismuth vandate and anthraquinone dye on the photodegradation of polycarbonate

Cited by 5 publications

References 18 publications

Influence of diazo pigment on polycarbonate photodegradation

Influence of diazo pigment on polycarbonate photodegradation

Improved durability of Bisphenol A polycarbonate by bilayer ceramic nano-coatings alumina-zinc oxide

Study on Weather Aging of Nitrile Rubber Composites Containing Imidazolium Ionic Liquids

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