The efficacy of photostabilizers on the color change of wood filled plastic composites

Muasher, M.; Sain, M.

doi:10.1016/j.polymdegradstab.2005.06.024

Cited by 157 publications

(171 citation statements)

References 18 publications

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“…The discoloration of the weathered samples could be attributed to the photooxidation of lignin (Muasher and Sain 2006;Peng et al 2014b). Actually, UV irradiation induces photo-oxidation, especially that of lignin, which is the wood flour component more sensitive to UV light due to the presence of chromophoric groups in its structure (Peng et al 2014b) linked to the surface bleaching.…”

Section: Colorimetric Analysismentioning

confidence: 99%

Effects of Carbon Black and Titanium Dioxide on Ultraviolet Weathering of Wood Flour-HDPE/Lumber Composites Using Multi-phase Co-extrusion Technology

Wang

Song

2017

BioResources

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A new type of wood-plastic/lumber composite (WPLC) was fabricated with laminated veneer lumber as a core, and the traditional wood-plastic composite (WPC) as a shell layer using multi-phase co-extrusion technology. This WPLC was used to manufacture a window frame, and the effects of inorganic pigments (carbon black (CB), titanium dioxide (TiO2), and their mixtures) on the decorative effect and ultraviolet (UV) weathering performance of the shell layer of the window frame were investigated. Weathering variables included UV irradiation duration and water spraying cycles for up to 6000 h. The surface color was analyzed by spectrophotometry during weathering. In addition, a scanning electron microscopy analysis and Fourier transform infrared spectroscopy analyzed the weathering properties of the WPLC shell layer. The results showed that (1) different decorative effects (white, grey, and black color) of the window frames were achieved by incorporating CB, TiO2, and their mixture; (2) the composites incorporated with CB and/or TiO2 exhibited less discoloration and fewer surface cracks; (3) the composites with CB and TiO2 showed a better photo-stability than those with a UV stabilizer (UV326). The overall color change (△E) of the composites incorporated with UV326, TiO2, and CB was 20.0, 11.7, and 10.8, respectively, after 3000 h of weathering; and (4) a combination of CB and TiO2 showed a synergistic effect on alleviating the photo-oxidation process of the WPC shell layers, which confirmed its UV-shielding effect.

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Section: Colorimetric Analysismentioning

confidence: 99%

Effects of Carbon Black and Titanium Dioxide on Ultraviolet Weathering of Wood Flour-HDPE/Lumber Composites Using Multi-phase Co-extrusion Technology

Wang

Song

2017

BioResources

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“…The increase in the carbonyl index was probably caused by the oxidation reaction of PVC, in both PVC compound and WPVC composites [22,28]. In WPVC composites, the carbonyl content could increase and then decrease at longer weathering times, this being associated with the photodegradation of lignin, which reversibly transformed the paraquinone to hydroquinone structures [12]. In addition to the cause of photodegradation in lignin, the decrease of carbonyl index for the WPVC specimen under natural weathering may be because the outer layer of the weathered specimens was washed away by rain.…”

Section: Discoloration Testingmentioning

confidence: 99%

“…Studies on the factors affecting on the properties of WPC under weathering conditions have focused on various aspects, such as weathering conditions (e.g. moisture, temperature, and biological decay) [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], wood content, processing method, weathering condition, and type and content of UV absorbers and pigments [3][4][5][6][7][8][9][10][11][12][13][14]. The presence of wood has been found to accelerate the photodegradation of WPC.…”

Section: Introductionmentioning

confidence: 99%

“…Filson et al [11] studied the effect of weathering on chemical and color changes of WPVC composites, and found that the conjugated ketones and lignin were reduced by weathering, whereas the cellulose part was unaffected. The use of a UV absorber and/or pigment could improve the stabilization of the polymer matrix in WPC, which prevent or retard the photodegradation [7,[12][13][14]. In addition to UV radiation, moisture and temperature are classified as effective variables affecting the property changes in WPC.…”

Section: Introductionmentioning

confidence: 99%

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Photodegradation profiles of PVC compound and wood/PVC composites under UV weathering

Chaochanchaikul¹,

Rosarpitak²,

Sombatsompop³

2013

Express Polym. Lett.

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Abstract. This work aimed to study the effect of different ultraviolet (UV) weathering conditions (natural and accelerated) on the photodegradation of polyvinyl chloride (PVC) and wood/polyvinyl chloride (WPVC) composites by considering the structural and physical changes of PVC and WPVC samples as well as examining the photodegradation profiles at different depths from the sample surfaces. The photodegradation of PVC and WPVC composites under natural weathering conditions were lower than those under accelerated weathering conditions. The addition of Tinuvin P stabilizer at 2 phr was sufficient to stabilize PVC and WPVC composites, whereas the presence of wood appeared to accelerate the photodegradation of PVC under both natural and accelerated weathering conditions. When considering the photodegradation profiles at different depths of the samples, it was found that the polyene and carbonyl sequences of PVC and WPVC composites were high at the sample surfaces and tended to decrease rapidly with increasing depth from the specimen surface before stabilizing at a depth of 60 µm for PVC and 80 µm for WPVC composites. The differences in specimen depths for the stabilization of polyene and carbonyl sequences in PVC and WPVC samples implied that the presence of wood particles enhanced the absorption of UV radiation by the WPVC composite samples.

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“…However, the lightness of WPVC-50 and WPVC-100 increased with aging. The increase in lightness of the WPVC composites after QUV-accelerated weathering aging and natural weathering can be explained by the lignin structure in wood flour changing from hydroquinone to para-quinone [34].…”

Section: Effects Of Quv-accelerated Weathering Aging and Natural Weatmentioning

confidence: 99%

Effects of UV-accelerated weathering and natural weathering conditions on anti-fungal efficacy of wood/PVC composites doped with propylene glycol-based HPQM

Srimalanon¹,

Yamsaengsung²,

Kositchaiyong³

et al. 2016

Express Polym. Lett.

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The efficacy of photostabilizers on the color change of wood filled plastic composites

Cited by 157 publications

References 18 publications

Effects of Carbon Black and Titanium Dioxide on Ultraviolet Weathering of Wood Flour-HDPE/Lumber Composites Using Multi-phase Co-extrusion Technology

Effects of Carbon Black and Titanium Dioxide on Ultraviolet Weathering of Wood Flour-HDPE/Lumber Composites Using Multi-phase Co-extrusion Technology

Photodegradation profiles of PVC compound and wood/PVC composites under UV weathering

Effects of UV-accelerated weathering and natural weathering conditions on anti-fungal efficacy of wood/PVC composites doped with propylene glycol-based HPQM

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