期刊缩写       SEN-I GAKKAISHI

期刊全称       SEN-I GAKKAISHI 《繊維学会誌》

出版国家       JAPAN

出版周期       Monthly

出版商         Japan Science and Technology I

期刊ISSN      0037-9875

2012-2013最新影响因子     0.177

 

 

Discoloration and Strength Reduction of Plant Fibers by Heat Degradation

 

In recent years, plant fiber, which consists of cellulose, attracts much attention as biobased materials. However, cellulose structure is easily altered by heat load. As a result, cellulose fibers undergo reduction in strength and discoloration. Such degradation of fiber is important problem for industrial use. In this study, the mechanical and color properties of cotton, ramie and kenaf fibers at the heating temperature of under 240℃ and heating period less than 120 min were discussed, and also their relation was investigated. The results of tensile test reveal that the tensile strength decreases with increasing temperature and heating period. Although the tensile strength differs by the kind of fiber, the reduction rate of tensile strength is similar for all kind of fiber. From the color measurement, the color difference between heated and unheated fiber increases with increasing temperature and heating period. The discoloration of cotton fiber is larger than ramie and kenaf fibers. In addition, from the evaluation of the relationship between discoloration and the strength reduction caused by heat load, it was revealed that there is a linear relation in the region less than 20 of color difference.

 

 

Activation of Orange II Decoloration Reaction with Peroxidase Under Low Temperature

 

Decoloration of Orange II catalyzed horseradish peroxidase (HRP) with activator as p-iodophenol, sodium nonanoyloxybenzenesulphonate (NOBS) and sodium p-phenolsufonate under low temperature was studied kinetically. Decoloration rate constant (k) that can prevent dye transfer of Orange II (k = 2.0 min-1) was not obtained in 3.4 × 10-8 M HRP without activator. Optimum condition using p-iodophenol was pH 8.9 Carmody buffer and 5.0 × 10-5 M p-iodophenol. Optimum pH using NOBS and sodium p-phenolsufonate were 10.1 and 10.3 respectively. Decoloration rate constant decreased with increase in the concentration NOBS. k = 2.0 min-1 was not reached unless high sodium p-phenolsulfonate. Therefore, it was found that the use of p-iodophenol appears optimal.

Decoloration reaction of Orange II using HRP with p-iodophenol and sodium percarbonate to prevent dye transfer was optimized under low temperature. The activation energy of decoloration of Orange II using HRP with p-iodophenol was 1/2 - 1/3 of those without activator and using sodium percarbonate.