On the degradation evolution equations of cellulose

Ding, H.-Z.; Wang, Zhongdong

doi:10.1007/s10570-007-9166-4

Cited by 98 publications

(55 citation statements)

References 31 publications

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“…The results also suggested that the color changes during heat treatment at the temperatures ranging from 90 to 180°C can be explained as the same reaction mechanism, presumably thermal oxidation, which occurs in the presence of oxygen and the absence of moisture. The values of E a calculated from the color parameters were similar to the reported values obtained from the other properties of cellulose, such as the degree of polymerization and mechanical properties [14,21,24,29]. However, these reported values have wide variation and are still controversial [21].…”

Section: Resultssupporting

confidence: 82%

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Kinetic analysis of color changes in cellulose during heat treatment

2011

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This paper deals with the kinetics of the color changes of cellulose during heat treatment. The color of cellulose heated at 90-180°C was measured by a spectrophotometer and expressed by CIELAB color parameters. The values of L* decreased and those of a*, b* and DE* ab increased at all the treatment temperatures. Several kinetic models, namely, the zero-order, first-order, second-order and autocatalytic model, were applied to the changes in the color values. Furthermore, the results of kinetic analysis using the best-fit model were compared to the results obtained from conventional kinetic models. It was suggested that the kinetic analysis using the best-fit model was the better way to accurately predict color changes during heat treatment. The values of apparent activation energy calculated from the changes of L*, a*, b* and DE* ab were 125, 124, 118 and 120 kJ/mol, respectively. These values were similar to the reported values calculated from other chemical or mechanical properties.

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Section: Resultssupporting

confidence: 82%

“…Numerous reports have discussed the applicability of kinetic models, especially with respect to the degree of polymerization and some mechanical properties [21,22]. However, there have been few reports dealing with the kinetic analysis of color properties [13].…”

Section: Kinetic Analysis For Color Changes Of Cellulosementioning

confidence: 99%

Kinetic analysis of color changes in cellulose during heat treatment

2011

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“…Much works are actually directed towards the improvement of interpretation rules/schemes, the separation of water from the aging process [18] and the improvement of measurement techniques [30,31]. Details about their basic principles can be found in the literature [26][27][28][29][30][31][32][33][34][35].…”

Section: Electrical Test Resultsmentioning

confidence: 99%

Characterization of aging transformer oil-pressboard insulation using some modern diagnostic techniques

Fofana

Bouaicha

Farzaneh

2010

Euro. Trans. Electr. Power

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SUMMARYThis paper presents a study on the characterization of aging of transformer oil-pressboard insulation. Traditional and modern diagnostic tools and techniques were used to investigate aging of oil-paper insulation under controlled laboratory conditions. Insulation condition testing includes common chemical diagnostics such as acidity tests and new chemical techniques: determination of relative content of dissolved decay products by spectrophotometry, solid suspension by turbidimetry, Fourier Transform Infrared (FTIR) spectroscopy and electrical diagnostic techniques that have gained exceptional importance for utility professionals: polarisation/depolarisation current, recovery voltage measurement and frequency domain dielectric spectroscopy measurements. From the obtained results it is found that chemical tests depicted more sensitivity to insulation degradation. Also, different oil-pressboard insulation ratios were investigated to assess the influence of the relative amount of cellulosic materials on aged mineral oil decay products and vice versa. Emphasize is laid on the potentialities/avenues offered by FTIR to assess oil insulation condition. Notable experimental results have been reported, which could be valuable to researchers and practicing engineers in this field.

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“…This approach might not be practical for historic documents, as the LODP is lower than the DP value of paper at which it can still be safely used, usually assumed to be 250-400 [17,46].…”

Section: Temperature and Relative Humiditymentioning

confidence: 99%

Dose–response functions for historic paper

Menart

Bruin

Strlič

2011

Polymer Degradation and Stability

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Paper degradation has been studied extensively over the past few decades from both the conservation and the material science perspectives. This review focuses on the quantifiable impacts of the environment and material composition, from the viewpoint of long-term storage of historic paper-based collections. Therefore, temperature, relative humidity and their variation, and pollution are of major interest while photoinitiated processes are covered only briefly.New experiments comparing the effects of the most abundant indoor pollutants (NO 2 , acetic acid and formaldehyde) and the effects of fluctuating temperature and relative humidity are also presented as part of the discussion. This work highlights the need for revision of the existing doseresponse (damage) functions for paper and their further development. KeywordsHistoric paper; hydrolysis; oxidation; viscometry; colorimetry; heritage science Historic paperDespite the ubiquity of electronic media, paper is still the most generally readable carrier of information. In heritage institutions, collections of documents of the past are being preserved for posterity. It has been estimated that in a typical Western repository, 70-80% of these documents [1] are likely to be acidic and therefore prone to rapid deterioration, their useful lifetime being about a century, a couple at best. This is in a stark contrast to paper produced before ca. 1850, the lifetime of which may be longer for at least a factor of 10 [1]. For curators of these collections, interventive conservation is an option, although the throughput of even mass treatments [2] is not sufficient to address the scale of the problem and the resources are too limited. Stab 96 (2011Stab 96 ( ) 2029Stab 96 ( -2039 2 In many cases, preventive conservation is therefore the preferred option. However, environmental managers may struggle with the abundance of literature available on environmental effects on paper degradation and the surprisingly scarce data that is well quantified and relevant not only to the scientist but to the user as well. Unlike a recent comprehensive review of the basic mechanistic and thermodynamic concepts [3], the focus of the present review is to provide an overview of dose response functions, based on which environmental management in paper-based collections could be optimised to minimise degradation while optimising resource use. Published in Polym DegradThe main structural component of paper is cellulose. As a linear homopolymer, it is composed of identical monomers and scission of inter-monomer bonds leads to its degradation [4]. It is well known that apart from temperature, water (humidity) and acidity in paper are important factors in its degradation [5][6][7]. Acid-catalysed hydrolysis is a major cause of paper strength loss [5,7], although other mechanisms may take place as well, such as oxidation and thermal degradation [7,8], depending on the experimental conditions. The effect of oxygen on the hydrolytic pathway should not be neglected, as differences between accelerate...

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On the degradation evolution equations of cellulose

Cited by 98 publications

References 31 publications

Kinetic analysis of color changes in cellulose during heat treatment

Kinetic analysis of color changes in cellulose during heat treatment

Characterization of aging transformer oil-pressboard insulation using some modern diagnostic techniques

Dose–response functions for historic paper

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