Effect of gamma radiation on carbamoylethylated cotton

A. Hebeish, A.H. Zahran , A.M.Kh. El-Naggar
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引用次数: 2

Abstract

Carbamoylethylated cotton samples having 0·392, 0·524, 0·725, 1·379 and 1·546% N were prepared by reacting cotton cellulose in the fabric form with different concentrations of acrylamide in the presence of NaOH. The behaviour of these samples towards gamma radiation was investigated and compared with untreated cotton and alkali-treated cotton which was prepared under conditions similar to those of carbamoylethylation but in the absence of acrylamide. Irradiation was performed at different radiation doses (3·307–29·766 Mrad). Results of copper number and carboxyl content indicated that the carbamoylethylated cotton samples exhibited higher resistance to irradiation than the alkali-treated and untreated cotton samples. Furthermore, this resistance was higher the greater the extent of carbamoylethylation, expressed as % N. With respect to degree of polymerization, results suggested that the presence of the carbamoylethyl groups in the molecular structure of cotton cellulose impeded glucosidic bond scission, provided that these groups were present in relatively small amounts. This and the indication of differences between the tensile strength and elongation at break among the substrates examined were interpreted in terms of differences in microstructural features which, in turn, determine the susceptibility of each substrate to irradiation irrespective of the radiation dose used.

辐射对氨基甲酰化棉的影响
在NaOH的存在下,以织物形态的棉花纤维素与不同浓度的丙烯酰胺反应,制备了N为0.392%、0.524、0.725、1.379和1.546%的氨甲酰乙基化棉花样品。研究了这些样品对伽马辐射的行为,并与未经处理的棉花和碱处理的棉花进行了比较,碱处理的棉花在类似于氨甲酰乙基化的条件下制备,但不含丙烯酰胺。辐照剂量为3·307 ~ 29·766 Mrad。铜含量和羧基含量的测定结果表明,经氨甲酰乙基化处理的棉花样品比碱处理和未经碱处理的棉花样品具有更高的抗辐照性。此外,氨甲酰乙基化程度越大,这种抗性越高,表示为% n。关于聚合程度,结果表明,棉花纤维素分子结构中氨甲酰乙基的存在阻碍了糖苷键的断裂,前提是这些基团的存在量相对较少。这和所检查的基材之间的拉伸强度和断裂伸长率之间的差异的指示是根据微观结构特征的差异来解释的,而微观结构特征的差异又决定了每种基材对辐射的敏感性,而不管所使用的辐射剂量如何。
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CiteScore
1.20
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