CAJ | 학술논문

为了探究木质素磺酸钠(木钠，SL)在固体平板上的吸附特征，利用层析分离和透析法得到不含无机盐的窄分子量分布的 SL，然后将 SL 与聚二烯丙基二甲基氯化铵(PDAC)在固体平板上逐层吸附得到多层膜，利用紫外-可见光光谱仪、椭圆偏振仪、原子力显微镜、接触角仪表征了SL的吸附特征。结果表明，疏水作用在SL的吸附中起了关键的作用。SL的吸附层较薄，10层SL/PDAC自组装膜的厚度不超过18 nm。SL/PDAC自组装膜的表面形貌较平整，其亲水疏水性能随聚阴、阳离子交替而呈现链齿形变化，其中SL层的平均接触角为50°。SL在阳离子表面的吸附包含单分子吸附和聚集体吸附两方面的贡献。低浓度条件下，SL的单分子吸附占主导地位，吸附速率较快，吸附速率随浓度的增加没有明显的变化。高浓度时，SL的吸附行为是单分子吸附和聚集体吸附的共同结果，所以吸附速率较慢，吸附速率随浓度的增加而降低。
위료탐구목질소광산납(목납，SL)재고체평판상적흡부특정，이용층석분리화투석법득도불함무궤염적착분자량분포적 SL，연후장 SL 여취이희병기이갑기록화안(PDAC)재고체평판상축층흡부득도다층막，이용자외-가견광광보의、타원편진의、원자력현미경、접촉각의표정료SL적흡부특정。결과표명，소수작용재SL적흡부중기료관건적작용。SL적흡부층교박，10층SL/PDAC자조장막적후도불초과18 nm。SL/PDAC자조장막적표면형모교평정，기친수소수성능수취음、양리자교체이정현련치형변화，기중SL층적평균접촉각위50°。SL재양리자표면적흡부포함단분자흡부화취집체흡부량방면적공헌。저농도조건하，SL적단분자흡부점주도지위，흡부속솔교쾌，흡부속솔수농도적증가몰유명현적변화。고농도시，SL적흡부행위시단분자흡부화취집체흡부적공동결과，소이흡부속솔교만，흡부속솔수농도적증가이강저。
In order to explore the adsorption characteristics of lignin lignosulfonate on solid plate, sodium lignosulfonate (SL) was used as polyanion to build up multilayer films at planar substrate by using poly(diallyldimethylammonium chloride) (PDAC) as the polycation. The adsorption characteristics were monitored by Uv-vis spectroscopy, ellipsometer, AFM, and contact angle measurements. Results show that the self-assembly of SL microgels and PDAC is mainly driven by hydrophobic interaction. The SL/PDAC self-assembly films are thin-the thickness of 10 bilayer SL/PDAC self-assembly film is no more than 18 nm. The film surfaces are generally flat and the surface wettability of SL/PDAC multilayers shows a jagged profile when the outmost layer varies between SL and PDAC, and the averaged contact angle of SL layer is about 50°. The total adsorbed amount of SL on polycations comes from adsorption of single molecules and aggregates. Under low concentration, SL adsorption is dominated by the adsorption of single molecules. The adsorption rate is relatively fast, and the adsorption rate has little change with increasing concentrations. Under high concentration, SL adsorption is controlled by the adsorption of both single molecules and SL aggregates. The adsorption rate is relatively slow, and the adsorption rate decreases with increasing concentrations.