The photo-degradation of PVC: Part II—Structural changes in PVC chains

Li, Jian; Zhou, Dafei; Zhao, Dan

doi:10.1016/0141-3910(91)90091-5

Cited by 33 publications

(15 citation statements)

References 7 publications

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“…33 Photodegradative processes under nitrogen take advantage of hydroperoxides formed during thermal processing and these hydroperoxides are converted to carbonyl groups. 33 Photodegradative processes under nitrogen take advantage of hydroperoxides formed during thermal processing and these hydroperoxides are converted to carbonyl groups.…”

Section: Other Contributions To the Mechanism Of Photodegradationmentioning

confidence: 99%

Principles of Uv Degradation

Wypych¹

2015

PVC Degradation and Stabilization

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Section: Other Contributions To the Mechanism Of Photodegradationmentioning

confidence: 99%

Principles of Uv Degradation

Wypych¹

2015

PVC Degradation and Stabilization

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“…8,9 Typically, however, the plasticisers used are of sufficiently high molecular weight to limit this loss to acceptable quantities during the 20-30 year lifetime of the product.…”

Section: Introductionmentioning

confidence: 99%

Effects of phthalate and sulphonic acid ester plasticisers on TiO₂ catalysed photodegradation of PVC

Martin¹,

Robinson²,

Worsley³

2008

Materials Science and Technology

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The effects of two plasticisers, one phthalate and one sulphonic acid ester, on the photodegradation of TiO 2 pigmented polyvinylchloride films are reported. The loading of each plasticiser was altered in the range 0-70% relative to the polyvinylchloride and the effects on the rates of photomineralisation were determined using a closed loop flow system to detect the carbon dioxide evolution. All plasticiser additions lead to an initial acceleration in CO 2 evolution over the non-plasticised cases. Non-plasticised films show a marked acid catalysis due to HCl evolution which leads to an acceleration in the rate of oxidation with time. Following initial rapid oxidation of preadsorbed plasticiser, the phthalate systems demonstrated a reduced rate of CO 2 production and no acid catalysis. The sulphonic acid ester plasticiser is broken down to produce sulphonic acid and sulphuric acid fragments which are sufficiently acidic to catalyse the TiO 2 when plasticiser loadings are .50%. The carboxylic acid fragments from the phthalates seem incapable of catalysis even at the highest levels used in the present work.

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“…Various defect sites in the polymer chain are thought to be responsible for this instability. Possible defect structures in PVC chains are allylic chlorine [8, 9], tertiary hydrogen and chlorine atoms [10, 11], end groups such as double bonds, oxygen‐containing groups, peroxide residues, and head‐to‐head structures [12–16]. In addition to these abnormalities, the steric order of the monomer units may have some influence on the degradation [17–19].…”

Section: Introductionmentioning

confidence: 99%

Photostabilizing efficiency of ultraviolet light stabilizers for rigid poly(vinyl chloride) against photo‐oxidation

Zhang

Guo

2012

Polymer Engineering & Sci

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The photostabilizing efficiency of different light stabilizers in poly(vinyl chloride) (PVC) was investigated by discoloration, ultraviolet (UV) reflection experiment, Fourier transform infrared spectrum (FTIR), and scanning electron microscopy (SEM). The results show that the addition of light stabilizers can slow down discoloration of PVC. The UV reflection results verify that this change is due to the distribution of light stabilizers on irradiated surfaces, which can absorb (such as organic stabilizers) or reflect (such as titanium dioxide) UV light differently. The order of stabilizers that can slower the extent of discoloration is titanium dioxide (TiO 2 ) > Tinuvin 234 (U4) > XT 833 (H2), U4 > Tinuvin 531 (U3) > Chimassorb 944 (H1), phenyl salicylate (U1). FTIR results show that the carbonyl group of pure PVC, TiO 2 , and H1-doped PVC increases significantly, indicating that the photooxidation reactions of these irradiated samples are relatively serious. The SEM results show that the surface damages of PVC doped with U2, U4, and H2 are somehow slighter, with only small holes or cavities on the surface, whereas the surfaces of pure PVC and H1doped PVC are full of big and deep holes and some holes or cavities of 10 lm are detected. POLYM. ENG.

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The photo-degradation of PVC: Part II—Structural changes in PVC chains

Cited by 33 publications

References 7 publications

Principles of Uv Degradation

Principles of Uv Degradation

Effects of phthalate and sulphonic acid ester plasticisers on TiO₂ catalysed photodegradation of PVC

Photostabilizing efficiency of ultraviolet light stabilizers for rigid poly(vinyl chloride) against photo‐oxidation

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The photo-degradation of PVC: Part II—Structural changes in PVC chains

Cited by 33 publications

References 7 publications

Principles of Uv Degradation

Principles of Uv Degradation

Effects of phthalate and sulphonic acid ester plasticisers on TiO2 catalysed photodegradation of PVC

Photostabilizing efficiency of ultraviolet light stabilizers for rigid poly(vinyl chloride) against photo‐oxidation

Contact Info

Product

Resources

About

Effects of phthalate and sulphonic acid ester plasticisers on TiO₂ catalysed photodegradation of PVC