Comparison of different photo-oxidation conditions of poly(vinyl chloride) for outdoor applications

Real, L.E. Pimentel; Ferraria, Ana Maria; Rego, A.M. Botelho do

doi:10.1016/j.polymertesting.2008.05.009

Cited by 53 publications

(25 citation statements)

References 14 publications

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“…The Yellowness Index is a number calculated from spectrophotometric data that describe the change in color of a test sample from clear or white to yellow. This test was used to evaluate the color change in an adhesive layer caused by external exposure [18][19][20][21][22][23].…”

Section: Methodsmentioning

confidence: 99%

Aging of silicone pressure-sensitive adhesives

2017

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Silicone pressure-sensitive adhesives (Si-PSA) exhibit unique properties, such as high Si-O-Si backbone flexibility, low intermolecular interactions, low surface tension, excellent thermal stability, and high UV transparency, which often explains why silicone PSAs have an impressive performance at high-and lowtemperature extremes, excellent electrical properties, chemical resistance, and outstanding weathering resistance turning them superior compared to organic PSAs. It is well known that due to their unique properties, silicone pressure-sensitive adhesives are materials for special applications. In the present study, we focus on changing the useful properties of the best compositions of silicone pressure-sensitive adhesives in time to verify the impact of aging on them. The influence of time on given silicone pressure-sensitive adhesive tapes and their useful properties is a very important factor for the description of the life-time of potential products based on such compositions. Aging of Si-PSA was carried out for 1 h, 24 h, 7 days, 31 days, and 92 days. The tests did include such properties like adhesion, cohesion (at 20 and 70°C), tack, and yellowness.

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Section: Methodsmentioning

confidence: 99%

Aging of silicone pressure-sensitive adhesives

2017

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“…It undergoes rapid autocatalytic dehydrochlorination upon exposure to heat and light during its molding and use, respectively [2]. As a result, conjugated polyene sequences are formed from the beginning of the reaction, and they give rise to discoloration of the polymer and seriously change its physical properties [3]. The low cost and the good performance of poly(vinyl chloride) products have increased the utilization of this polymer in building, mainly in exterior application, such as window profiles, cladding structure, and siding [4].…”

Section: Introductionmentioning

confidence: 99%

Ultra-violet spectra studies of photodegradation of PVC films in presence of Fe(III) chelate complex

et al. 2014

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A complex of Fe(III) with 4-amino-5-(pyridyl)-4H-1,2,4-triazole-3-thiol was prepared and evaluated as a photodegradation for rigid poly(vinyl chloride) (PVC). Polyvinyl chloride dissolved with Fe(III) complex in THF solvent to form PVC films of 5% (40 μm) thickness containing different concentrations (0.01, 0.02, 0.03, 0.04 and 0.05 g) of the complex by weight. These different samples were produced by the casting method from the solvent. The photodegradation of films was investigated using UV-visible spectra. The photostabilization activity of these compounds was determined by calculating the photodecomposition rate constant (Kd) for modified PVC films against a blank. PVC Triazole UV-light Fe(III) complex Photochemistry Photodegradation

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“…The peaks around 2500-3000 cm À1 represent C-H vibrations and the one around 1733 cm À1 is indicative of the formation of carbonyl groups as a consequence of degradation, which are in the neighborhood of C-Cl bonds. 5,32 On the other hand, if the possible formed carbonyl groups are classified as -lactones, esters, ketones, and carboxylic acids, the appeared peak can be attributed to the esters. 33 The peaks around 500-610 and 800-1000 cm À1 are the characteristic of crystalline rutile and its reduction products.…”

Section: Results and Discussion Ftir Analysis Of Nanocompositesmentioning

confidence: 99%

“…By absorbing solar ultraviolet (UV) radiations, PVC can undergo photodegradation reactions, which finally result in its degradation. 4,5 The photodegradation of PVC is complex, but it has been known that irradiation of PVC leads to dehydrochlorination (hydrochloric acid (HCl) elimination) reactions, which result in the formation of conjugated double bonds and chain-scission processes. Furthermore, photooxidation of PVC can lead to the formation of carbonyl and hydroperoxide compounds.…”

Section: Introductionmentioning

confidence: 99%

Effect of long time exposure on the chemical and physical properties of polyvinyl chloride/titanium dioxide nanocomposites

Mehmandoust

Sokhandani

Abdi

et al. 2016

Journal of Thermoplastic Composite Materials

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The photodegradation behavior of poly(vinyl chloride) (PVC) nanocomposites containing different amounts of synthesized titanium dioxide (TiO 2 ) nanoparticles and commercial rutile powder is investigated via the formation of carbonyl compounds, peroxides, and polyenes propagation over 5112 h exposure, as a function of irradiation wavelength and intensity. All the PVC/TiO 2 nanocomposites are found to exhibit lower concentration of mentioned species compared with the composite samples. The results show that added TiO 2 nanoparticles can retard the photodegradation processes, wherein increasing the amounts of these nanoparticles yields more reduction. With an increase in irradiation intensity the rate of formation of investigated groups increases, although in cases with raised temperature range, this pattern is not observed. An evaluation on the irradiation wavelength effect also shows that more photon energy provides more degradation. The loss of weight analysis shows a tremendous and novel result on evaluating a point of meaningful weight loss.

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Comparison of different photo-oxidation conditions of poly(vinyl chloride) for outdoor applications

Cited by 53 publications

References 14 publications

Aging of silicone pressure-sensitive adhesives

Aging of silicone pressure-sensitive adhesives

Ultra-violet spectra studies of photodegradation of PVC films in presence of Fe(III) chelate complex

Effect of long time exposure on the chemical and physical properties of polyvinyl chloride/titanium dioxide nanocomposites

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