ABSTRACT

The positively chitosan, CS, and negatively lignosulfonate, LGS, were statically mixed forming a series of mixed solutions. Experimentally, the light brown LGS solution was slowly flowed into the colorless CS solution to form the as-prepared CS/LGS mixed solutions. These mixing solutions presented regular bi-phases taking the LGS phase at the top and the CS phase at the bottom where the difference is the phase thickness varied with the mixing ratio variety. To keep the static mixing condition up to the 3rd, 12th and 15th days, these CS/LGS mixed solutions presented two-phase change tendencies because the CS percent greater samples kept the bi-phases and the LGS percent greater samples presented a tri-phases with a new darker yellow phase at the bottom and a new light yellow phase at the middle. This indicated that the statical mixing time has caused the electrostatic interaction occurrence between the CS and LGS solutions when the reaction degree was influenced by the mixing ratio. The particle size for the CS/LGS mixed solutions with the mixing ratio at 70/30 and 30/70 vol% both after static mixing of 15 days was analyzed and found it was smaller at about 200–300 nm in the upper phase and greater at about 1100–1300 nm in the bottom phase corresponding to the formed micelles and the precipitated aggregates, respectively. Recorded dynamic conductivity revealed that the electrostatic interaction between the CS and LGS strongly occurred after static mixing of about 300 s and the start time was controlled by the mixing ratio, especially the LGS percent.

摘要

正壳聚糖 CS 和负木质素磺酸盐 LGS 静态混合形成一系列混合溶液。实验上，将浅棕色 LGS 溶液缓慢流入无色 CS 溶液中，形成所制备的 CS/LGS 混合溶液。这些混合溶液呈现规则的双相，顶部为 LGS 相，底部为 CS 相，不同之处在于相厚度随混合比的变化而变化。为了将静态混合条件保持到第 3、12 和 15 天，这些 CS/LGS 混合溶液呈现出两相变化趋势，因为 CS 百分比较大的样品保持双相，而 LGS 百分比较大的样品呈现三相底部有一个新的深黄色相，中间有一个新的浅黄色相。这表明当反应程度受混合比例影响时，静态混合时间导致CS和LGS溶液之间发生静电相互作用。对混合比为 70/30 和 30/70 vol% 的 CS/LGS 混合溶液在静态混合 15 天后的粒度进行了分析，发现它在上相的约 200-300 nm 处更小，并且更大在底部相中约 1100-1300 nm 处，分别对应于形成的胶束和沉淀的聚集体。记录的动态电导率表明，CS 和 LGS 之间的静电相互作用在静态混合约 300 秒后强烈发生，并且开始时间由混合比例控制，尤其是 LGS 百分比。