改性漆酶协同谷氨酸改善二次纤维微观结构及性能的研究

摘要

In this study the laccase was modified by the reaction between the L-phenylalanine methyl ester hydrochloride's and the carboxyl group(—COOH) of amino acid terminal of laccase.The influence of modified laccase-glutamic acid system on microstructure and physical properties of OCC fiber was investigated.The results showed that the microstructure of fiber treated with modified laccase-glutamic acid changed significantly,and partial fibrillation was observed.And the fiber surface appeared closely laminated structure.The fiber micropores collapsed and expanded to mesopores gradually,and BET specific surface area and average pore size increased.The content of carboxyl groups increased 26.9％ compared to the control pulp after modified laccase-glutamic acid treatment by Michael addition reaction between the glutamic acid and lignins.The OCC fiber after modified laccase-glutamic acid treatment had good beating and papermaking performance,while the power consumption decreased.%采用L-苯丙氨酸甲酯盐酸盐对漆酶氨基酸残基末端的羧基进行改性,研究改性漆酶-谷氨酸体系对旧瓦楞箱纸板(OCC)浆纤维微观结构及性能的影响.研究结果表明,与未改性漆酶-谷氨酸相比,经过改性漆酶-谷氨酸体系处理后OCC浆纤维表面呈层叠状紧密黏连,细纤维化程度更高;改性漆酶催化氧化木素,使纤维微孔结构瓦解并逐渐扩大为中孔,纤维BET比表面积和平均孔径增大;谷氨酸通过迈克尔加成反应嫁接到木素上使纤维羧基含量进一步提升,与OCC原浆相比纤维羧基含量提高了26.9％;显著改善纸浆的打浆性能,降低了打浆能耗;对纸浆的增强作用更加明显.