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Effect of combined gamma-irradiation and alkali treatment on cotton–cellulose

Effect of combined gamma-irradiation and alkali treatment on cotton–cellulose,10.1016/S0969-806X(99)00409-0,Radiation Physics and Chemistry,E. Takács,

Effect of combined gamma-irradiation and alkali treatment on cotton–cellulose   (Citations: 11)
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The influence of high-energy irradiation and sodium hydroxide treatment on the structure of cotton–cellulose was studied. The irradiation resulted in degradation of cellulose characterized by the decrease in the degree of polymerization (viscosimetry) and increase in the carbonyl content (FTIR, CO stretching band at 1740 cm−1). The treatment with NaOH after irradiation had no significant effect on these characteristics. However as it was shown by XRD and SEM that the transformation of the crystalline structure from cellulose I to cellulose II was observed at lower alkaline concentration when irradiation pretreatment was applied.
Journal: Radiation Physics and Chemistry - RADIAT PHYS CHEM , vol. 57, no. 3, pp. 399-403, 2000
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    • ...Cleavage of β-(1,4)-glycosidic bonds leading to an increase in surface area and a reduction in crystallinity was observed after applying γ-rays to cellulose (Takacs et al, 2000)...

    Florian Monlauet al. Lignocellulosic materials into Biohydrogen and Biomethane: impact of s...

    • ...[ 12 , 13 ] Chemical pretreatments under alkaline or acid condition are commonly used to increase the accessibility of the cellulose...

    Yongcan Jinet al. Green Liquor Pretreatment of Mixed Hardwood for Ethanol Production in ...

    • ...When irradiation is applied in the presence of oxygen, carbonyl groups are formed on the cellulose (Saeman et al. 1952; Dziedziela and Rosiak 1977; Muto et al. 1995) and a linear relationship has been found between carbonyl infrared absorption at 1740 cm )1 and the dosage (Taba´ cs...
    • ...Carboxylic acid group formation has also been claimed (Saeman et al. 1952; Nitzel 1984)...
    • ...It has been reported that carbonyl groups are formed in the presence of air during irradiation (Saeman et al. 1952; Dziedziela and Rosiak 1977; Muto et al. 1995; Taba´ cs et al. 2000) but the effect of varying the electron beam energy has never been addressed...
    • ...� Formation of carboxylic groups has been claimed (Saeman et al. 1952; Dziedziela and Rosiak 1977) � Formation from cotton but not from hardwood kraft (Muto et al. 1995) � No evidence of carboxylic group formation (Nitzel 1984) � A decrease of carboxylic group (decarboxylation and CO2 emission) (Ducha´ cˇ ek and Blud’ovsky...

    Jean Bouchardet al. The effects of ionizing radiation on the cellulose of woodfree paper

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