中文摘要：

分别制备了不同磺酸基含量的磺化碱木质素（SAL）、不同交联度和分子量的磺化碱木质素聚氧乙烯醚（SAL-PEG）,采用动态光散射（DLS）法分别研究磺酸基含量和PEG非离子长链对SAL和SAL-PEG溶液行为的影响规律.结果表明,不同磺酸基含量（1.28~2.09 mmol/g）的SAL在1.0 g/L的水溶液中存在聚集行为,磺酸基含量的增加使SAL的分子舒展程度增加,聚集程度越弱;Na Cl的加入使SAL的分子舒展程度减小,聚集体发生解聚.不同PEG含量的SAL-PEG在1.0 g/L的水溶液中主要以单分子状态存在,聚集行为较弱,分子的流体动力学半径与其分子量和交联度成正比;Na Cl的加入使SAL-PEG的PEG非离子长链却被严重压缩,分子流体动力学半径显著减小,减小程度与其分子量和交联度成正比,但SAL-PEG的聚集程度仍然较弱.

英文摘要：

The sulfonated alkali lignin （SAL） with different sulfonic group contents and the sulfonated alkali lignin polyethenoxy ether （SAL-PEG） with different crosslinking degrees and molecular weights were prepared. The effects of the sulfonic acid group content and the PEG nonionic long chain on the behaviors of SAL and SAL-PEG in solution were studied by dynamic light scattering （DLS）. The results showed that the aggregation behavior existed in 1.0 g/L SAL aqueous solutions. And the degree of aggregation decreased with increasing the sulfonic acid group content of SAL,because the more sulfonic acid groups caused the increasing molecular stretch degree of SAL. The addition of 2 mol/L NaC1 made the molecular configuration of SAL become compact in solution and the aggregates of SAL were disaggregated evidently. The SAL-PEG mainly took the form of single molecule in 1.0 g/L aqueous solution, with weak aggregation behavior, and the hydrodynamic radius （Rh ） of SAL-PEG was proportional to its molecular weight and the crosslinking degree. The addition of 2 mol/L NaC1 made the PEG nonionic long chain of SAL-PEG become compact severely in solution,and Rh of SAL-PEG was significantly reduced. Meanwhile the degree of reduction was proportional to its molecular weight and cross-linking degree,but the degree of aggregation of SAL-PEG was still weak.