Photodegradation of PVC

Decker, Christian

doi:10.1007/978-94-009-5618-6_3

Cited by 41 publications

(20 citation statements)

References 113 publications

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“…This is responsible for "chalking" of extensively exposed PVC siding materials. Both the tensile strength and the extensibility of rigid PVC samples also decrease with the duration of exposure to solar UV radiation and the material finally embrittles (Decker, 1984). Similar changes also take place on exposure of plasticized PVC formulations used in membrane roofing applications and cable coverings (Matsumoto et al, 1984).…”

Section: Uv Damage To Polymersmentioning

confidence: 69%

“…Estimated demand for Asia alone is more than that for the US, Canada and the European community combined (Gappert, 1996). Exposure to solar UV radiation is well known to decrease the impact strength of the polymer (Decker, 1984). As the surface layers of the plastic material degrades the titanium dioxide powder used as an opacifier is gradually released and may even form a surface layer loose enough to be rubbed off.…”

Section: Uv Damage To Polymersmentioning

confidence: 99%

“…The photothermal mechanisms leading to the formation of conjugated polyenes that causes yellowing, is well understood (Decker, 1984: Gardette et al, 1991). An opacifier (generally rutile titania) is used to slow down the rate of yellowing in white profiles widely used in siding, window frames and pipes (Titow, 1984 ).…”

Section: Uv Damage To Polymersmentioning

confidence: 99%

See 2 more Smart Citations

Environmental effects of ozone depletion: 1998 assessment

Leun¹,

Tang²,

Tevini³

1998

Journal of Photochemistry and Photobiology B: Biology

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Section: Uv Damage To Polymersmentioning

confidence: 69%

Section: Uv Damage To Polymersmentioning

confidence: 99%

See 1 more Smart Citation

Environmental effects of ozone depletion: 1998 assessment

Leun¹,

Tang²,

Tevini³

1998

Journal of Photochemistry and Photobiology B: Biology

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“…If we wish to evaluate the properties of a Ca-Zn system, more severe conditions will be required: for example, about 135 hours of irradiation in a SEPAP 12.24 unit + 150 hours in an oven at 65°C (see FYg. 4).…”

Section: Journal Of Vinylmentioning

confidence: 99%

Towards the prediction of pinking of PVC profiles in mild climatic conditions

Lemaire¹,

Siampiringue²,

Chaigneau³

et al. 2000

Vinyl Additive Technology

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pinking of Ti0,-pigmented WC can be observed for profiles exposed to the mild environmental conditions of Northern European countries. In this paper, the pinking phenomenon is accounted for at the molecular level by the formation of polyene sequences which are not completely photooxidatively bleached under conditions of oxygen starvation. Photoreduction of TiO, to give Ti(II1) species accounts for greying which cannot be converted into pinking under mild thermooxidative conditions (65°C). The polyenic sequences which account for an initial greying after brief exposure in the SEPAP 12.24 apparatus can be converted into shorter, modified polyene sequences which explain the pinking. From the basic understanding gained, a predictive test has been designed and validated by comparison with results obtained under natural exposure conditions. n the mild climatic conditions typical of Northern

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“…During service use, PVC products can be attacked by UV light at wavelengths greater than λ > 250 nm. These wavelengths have sufficient energy to cleave the CCI bond, which has a bond energy of 325 kJ mol −1 , resulting in a degradation of PVC compounds 9. The degradation of PVC can proceed by a dehydrochlorination process, which gives rise to the formation of long conjugated double bonds or polyene sequences (CHCH) n , which are responsible for the discoloration of the irradiated PVC products.…”

Section: Introductionmentioning

confidence: 99%

Structural changes and mechanical performance of recycled poly(vinyl chloride) bottles exposed to ultraviolet light at 313 nm

Sombatsompop

Sungsanit

2004

J of Applied Polymer Sci

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ABSTRACT:The structural changes and mechanical performance of virgin poly(vinyl chloride) (PVC) bottle (VB) compounds blended with postconsumer PVC bottles collected from a specified factory (RB-F) and houses (RB-H), were examined before and after UV irradiation at 313-nm UV wavelength for different periods of time up to 28 days. The results indicated that, when exposed to UV light, the RB-F/VB blends containing greater conjugated double bonds with higher yellowness index appeared to exhibit better mechanical performance than that of the RB-H/VB blends. It was found that the amount of conjugated double bonds was not a linear function of the discoloration level of PVC compounds. Tensile strength of the VB compounds was not affected when incorporated with RB-F recyclate, but progressively decreased with increasing RB-H recyclate. An optimum concentration for RB recyclates to be added into the virgin compound was recommended for obtaining a maximum impact strength. Both tensile and impact strengths decreased with increasing UV exposure time, a severe degradation being obvious after a UV exposure time of 21 days. Hardness was not affected significantly by the addition of PVC recyclate, but increased with increasing UV exposure time.

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Photodegradation of PVC

Cited by 41 publications

References 113 publications

Environmental effects of ozone depletion: 1998 assessment

Environmental effects of ozone depletion: 1998 assessment

Towards the prediction of pinking of PVC profiles in mild climatic conditions

Structural changes and mechanical performance of recycled poly(vinyl chloride) bottles exposed to ultraviolet light at 313 nm

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