马尾松热磨机械浆在过氧化氢漂白中的表面特征

Surface Characteristic of H_2O_2-Bleached Thermo-Mechanical Pulp from Pinus Massoniana Lamb

用CIE1 976L a b 色度系统和X射线光电子能谱仪 (XPS)表征了H2 O2 漂白的马尾松热磨机械浆 (TMP)的表面。实验结果表明 ,H2 O2 漂白大幅度提高了浆的白度和L 值 ,减少了a 值和b 值 ;提高H2 O2 用量 ,几乎不改变L 和a 值 ,但b 值随H2 O2 用量的增大而逐渐减小。马尾松TMP的XPS谱图显示 ,H2 O2 漂白的主要作用之一是降低马尾松TMP表面的可溶木质素和提取物的含量 ,增加纤维素和酚羟基的含量。与预期的效果相反 。

Surface characteristic of H 2O 2-bleached thermo mechanical pulp (TMP) from pinus massoniana Lamb was studied by using CIE1976 L*a*b* system and XPS. The results showed that H 2O 2-bleaching increased significantly the brightness and L* values, and reduced a* values and b* values of the TMP. The increase in concentration of H 2O 2 did not change L* and a* values very much, but decreased b* values of TMP. The XPS spectra of the bleached TMP showed that H 2O 2-bleaching decreased significantly the contents of dissolving lignin and extracts, and increased cellulose and phenolic hydroxyl groups on the pulp surface. The C 3 peak area in XPS spectra of the bleached pulp changed very little, suggesting that more O—C—O and C—O—CO structures were present on surface of the bleached pulp.