Energy and acid-base characteristics of cellulose nitrate surface with various substitution degree

Баранова, Н. В.; Pashina, L. A.; Bogdanova, S. A.; Kostochko, A. V.

doi:10.1134/s1070427211120238

Cited by 4 publications

(3 citation statements)

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“…The molecular theory of the adhesion of polymers is the concept of acid-base interaction on a polymer interface 24 . As expected from the chemical composition of cellulose nitrate (Table 1), its surface has acid properties: NO 2 group acts as a strong electron-acceptor substituent.…”

Section: Resultsmentioning

confidence: 99%

“…Polarization of the C – H bond in cellulosic ring results in a rise of acid dissociation, thus imparting acidity to the surface 24 . Consequently, the more acidity / basicity of the interface layer of polymer the more adhesive / binding capacity of the polymer.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the more acidity/basicity of the interface layer of the polymer, the more adhesive/binding capacity of the polymer. An increase in the content of polar groups in cellulose nitrate is accompanied by an increase of the free surface energy . As a result, the surface acidity of cellulose nitrates increases as the substitution degree increases.…”

Section: Results and Discussionmentioning

confidence: 99%

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Role of the Filters in the Formation and Stabilization of Semiquinone Radicals Collected from Cigarette Smoke

2013

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The fractional pyrolysis of Bright tobacco was performed in nitrogen atmosphere over the temperature range of 240 – 510 °C in a specially constructed, high temperature flow reactor system. Electron paramagnetic resonance (EPR) spectroscopy was used to analyze the free radicals in the initially produced total particular matter (TPM) and in TPM after exposure to ambient air (aging). Different filters have been used to collect TPM from tobacco smoke: cellulosic, cellulose nitrate, cellulose acetate, nylon, Teflon and Cambridge. The collection of the primary radicals (measured immediately after collection of TPM on filters), the formation and stabilization of the secondary radicals (defined as radicals formed during aging of TPM samples on the filters) depend significantly on the material of the filter. A mechanistic explanation about different binding capability of the filters decreasing in the order: cellulosic < cellulose nitrate < cellulose acetate < nylon ~ teflon is presented. Different properties were observed for the Cambridge filter. Specific care must be taken using the filters for identification of radicals from tobacco smoke to avoid artifacts in each case.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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