直链醇对木质素磺酸钠的聚集态和吸附特性的影响  

Influences of Alcohols on the Aggregative State and Adsorption Characteristics of Sodium Lignosulfonate

作　　者：邱学青[1,2] 冯雪敏[1,2] 杨东杰[1,2] 李荣[1,2] 

机构地区：[1]华南理工大学化学与化工学院 [2]制浆造纸工程国家重点实验室,广州510640

出　　处：《高分子学报》2015年第1期72-79,共8页Acta Polymerica Sinica

基　　金：国家国际科技合作专项项目(项目号2013DFA41670);国家重大基础研究发展计划(973计划,项目号2012CB21530);国家自然科学基金(基金号21176096,21376100);中央高校基本科研业务费专项资金资助;广东省科技计划项目(项目号2012B010200021)资助

摘　　要：揭示了直链醇对木质素磺酸盐(简称木钠,SL)表面物化性能的增效机理.采用zeta电位仪、激光粒度仪和透射电镜(TEM)等表征方法研究了直链醇对木钠聚集态的影响,采用静电组装技术、原子力显微镜和频率-耗散联用型石英晶体微天平(QCM)等进一步研究了不同碳链长度的直链醇对木钠吸附特性的影响.结果表明,直链醇通过与木钠聚集体相互作用,促使包裹在木钠内部的羧基不断裸露出来,增加其在水溶液中的负电性,降低木钠在水溶液中的聚集程度,碳原子数较大的醇类效果更明显.直链醇使木钠在固体表面吸附膜的吸附构型由刚性、致密逐渐转变为松散、伸展.单纯木钠的吸附构型是以阳离子-π作用力为主的mushroom型,直链醇则使其转变为以静电作用力为主的高分子刷,从而显著增加木钠在固体表面上的吸附量且使吸附膜更均匀和光滑.In order to reveal the enhancement mechanism of straight chain alcohols on the physicochemical properties of SL, the influences of alcohols on the aggregation structure of SL were investigated by means of zeta potential measurement, laser particle size analyzer and transmission electron microscope （TEM）, and the influences of alcohols with different carbon chain lengths on the adsorption characteristics of SL were further studied by using electrostatic layer-by-layer self-assembly, atomic force microscope （AFM） and a quartz crystal mierobalance with dissipation monitoring （QCM-D）. The results indicated that the hydrocarbon chain of alcohols produced hydrophobic interactions with the hydrophobic core of SL, prompting the carboxyl group wrapped inside to be continuously exposed out so as to increase its negative charge and reduce the degree of aggregation in aqueous solutions. The effects of alcohols with longer carbon chains were more obvious. With the addition of alcohols,the adsorption configuration of SL on solid surface changed from rigid and tight to soft and loose. The adsorption configuration of SL without adding alcohols was mushroom-like structure, of which cation-π interaction was the main driving force. The adsorption configuration of SL with adding alcohols turned into polymer brushes, in which electrostatic interaction played an important role, and increased the adsorption amount of SL on solid surface sharply,facilitating the adsorption films more uniform and smooth.

关 键 词：木质素磺酸钠 直链醇 聚集 吸附 

分 类 号：O636.2[理学—高分子化学]