γ－射線照射對紙張物理化學性質的影響

Effects of Gamma Ray Irradiation on the Mechanical and Chemical Properties of Papers

蘇裕昌(Yu-Chang Su) ； 趙國評(Kuo-Ping Chao) ； 陳鴻財(Horng-Tsai Chen) ； 陳家傑(Chia-Chieh Chen)

《台灣林業科學》 14卷2期 (1999/06) Pp. 119-130

https://doi.org/10.7075/TJFS.199906.0119

摘要

This study evaluated the mechanical and chemical properties of γ-ray irradiated papers under various dosages of γ-ray irradiation. Papers for writing and painting such as filter paper, handmade painting paper, machine-made painting paper, and xerox paper were used for testing. Results showed that at low and medium levels of γ-ray irradiation (≦2.5 Mrad) mechanical properties of resulting papers showed a 10-15% decrease. At higher dosage (＞10 Mrad) the mechanical properties of papers were strongly degraded and xerox paper showed the least retained strength. Papers for industrial usages such as liner board and corrugated medium base paper were also tested. Resulting papers showed no significant difference in mechanical properties at low dosages of irradiation. Samples with higher dosages of irradiation showed decreases in tearing and folding strength, but compression strength of these samples increased even at 25 Mrad irradiation. These results reveal that γ-ray irradiation is suitable for use as a sterilization method for this grade of paper. Chemical properties of resulting papers at every dosage of irradiation changed greatly, such as a decrease in pH values, an increase of 1% NaOH solubles, decreasing viscosities, and a decrease of DP; at higher dosages of irradiation, papers degraded to a greater degree. At low dosage of irradiation, no significant strength property changes were shown, but the chemical properties of irradiated paper showed a certain degree of degradation. No significant changes of cellulose crystallinity index were shown at any dosage of irradiation. Results reveal that degradation occurred at amorphous regions.

關鍵字

γ－射線照射 ； 紙張 ； 物理性質 ； 化學性質 ； 劣化

並列摘要

This study evaluated the mechanical and chemical properties of γ-ray irradiated papers under various dosages of γ-ray irradiation. Papers for writing and painting such as filter paper, handmade painting paper, machine-made painting paper, and xerox paper were used for testing. Results showed that at low and medium levels of γ-ray irradiation (≦2.5 Mrad) mechanical properties of resulting papers showed a 10-15% decrease. At higher dosage (＞10 Mrad) the mechanical properties of papers were strongly degraded and xerox paper showed the least retained strength. Papers for industrial usages such as liner board and corrugated medium base paper were also tested. Resulting papers showed no significant difference in mechanical properties at low dosages of irradiation. Samples with higher dosages of irradiation showed decreases in tearing and folding strength, but compression strength of these samples increased even at 25 Mrad irradiation. These results reveal that γ-ray irradiation is suitable for use as a sterilization method for this grade of paper. Chemical properties of resulting papers at every dosage of irradiation changed greatly, such as a decrease in pH values, an increase of 1% NaOH solubles, decreasing viscosities, and a decrease of DP; at higher dosages of irradiation, papers degraded to a greater degree. At low dosage of irradiation, no significant strength property changes were shown, but the chemical properties of irradiated paper showed a certain degree of degradation. No significant changes of cellulose crystallinity index were shown at any dosage of irradiation. Results reveal that degradation occurred at amorphous regions.

並列關鍵字

γ-ray irradiation ； paper ； mechanical property ； chemical property ； degradation