Photoyellowing of wool. Part 1: Factors affecting photoyellowing and experimental techniques

Millington, Keith R.

doi:10.1111/j.1478-4408.2006.00034.x

Cited by 101 publications

(72 citation statements)

References 103 publications

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“…17 Emission of PICL from polymers is dependent on the presence of oxygen, and for hydrocarbon polymers the accepted dominant mechanism involves a bimolecular reaction between two adjacent polymer macroperoxy radicals via an excited carbonyl intermediate, as shown by eq 6 in Scheme 1.…”

Section: Picl Decay Profiles and Preliminary Kinetic Analysismentioning

confidence: 99%

Kinetics of Photo-Induced Chemiluminescence Decay from Polymers

Millington

Maurdev

2009

Polym. J.

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Previous studies showed that the decay of photo-induced chemiluminescence (PICL) in polymers does not obey classical first or second order kinetics. This study demonstrates that plotting PICL second-order decay from three fibrous polymers (polypropylene, polyamide 6 and wool keratin) in a modified form gives excellent linear plots. The existence of a significantly less reactive fraction of macroperoxy radicals in heterogeneous polymers can explain the deviation from classical behaviour and this fraction can be quantified from the gradient of the modified plots. This unreactive fraction could be due to either dispersive or diffusive effects in a disordered heterogeneous polymer medium. Both dispersive and diffusive models give very good fits to the PICL decay profiles using three fitting parameters.

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Section: Picl Decay Profiles and Preliminary Kinetic Analysismentioning

confidence: 99%

Kinetics of Photo-Induced Chemiluminescence Decay from Polymers

Millington

Maurdev

2009

Polym. J.

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“…This reaction is catalyzed by trace metals such as iron and copper (150,151). It has been proposed that the photoyellowing mechanism for wool may involve a free-radical chain reaction involving formation of hydroperoxide intermediates (via the Bolland and Gee autooxidation mechanism (152) as is the case for most other polymers), rather than a singlet oxygen mechanism (149,(153)(154)(155). Studies using electron spin resonance (156,157) and chemilumninescence techniques (158) have shown that free radicals are formed when wool is exposed to UV light.…”

Section: Yellowingmentioning

confidence: 99%

Wool: Structure, Properties, and Processing

Rippon

Christoe

Denning

et al. 2016

Encyclopedia of Polymer Science and Technology

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Wool, the fibrous coating from sheep, is the most important animal fiber used by the textile industry. It has been used continuously for several thousand years, the earliest type of fabric made from wool probably being a felt. Although the relative importance of wool as a textile fiber has declined with the increasing use of synthetic fibers, it remains important in some sectors of the market. This article discusses raw wool specification, fiber growth, its complex morphological and chemical structure, and the physical properties that make wool unique among textile fibers. Also discussed are the processing steps used to transform raw wool into consumer products, namely, scouring, carbonizing, carding, spinning, setting, dyeing, bleaching, printing, and treatments to reduce felting shrinkage, insect damage, and flammability. A novel textile fiber made from wool (Optim TM , CSIRO) is also described.

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“…Trace metal ions (such as Fe) enhance the photodegradation process of several fibers, including cotton. For instance, they participate to the oxidative degradation of cellulose [20,21] and increase the concentration of hydroxyl radical generated upon light exposure [18]. As well, iron influences the degradation of cellulose in iron gall-ink manuscripts [22].…”

Section: Prussian Blue and Textile Substrate Act As A Redox Systemmentioning

confidence: 99%

Light and anoxia fading of Prussian blue dyed textiles

et al. 2014

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Although Prussian blue is a popular pigment, its stability has been questioned since its discovery in 1704. Its stability upon exposure to light and anoxia remains difficult to apprehend. The present paper focuses on the relative influences of light, anoxia and type of substrate on the discoloration of Prussian blue dyed textiles. Spectrophotometry and X-ray absorption spectroscopy measurements of samples artificially aged by light in air or anoxia show that both the extent of the reduction process at the origin of Prussian blue discoloration and the aging of the textile substrate are linked and strongly differ with the environment. The complex inter-relationship existing between Prussian blue discoloration and textile degradation and the final impact it may have on the conservation of the entire system is discussed.

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Photoyellowing of wool. Part 1: Factors affecting photoyellowing and experimental techniques

Cited by 101 publications

References 103 publications

Kinetics of Photo-Induced Chemiluminescence Decay from Polymers

Kinetics of Photo-Induced Chemiluminescence Decay from Polymers

Wool: Structure, Properties, and Processing

Light and anoxia fading of Prussian blue dyed textiles

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