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Development of New Functional Polyelectrolytes From Lignins.

木质素新型功能聚电解质的开发。

基本信息

批准号：
03556022
负责人：
MESHITSUKA Gyosuke
金额：
$ 8.9万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

It is quite essential to develop new and characteristic ligno-chemicals for the economically feasible total- utilization of wood. In this research, the developments of new ligno-polyelectrolytes which can be utilized as dispersing agents and soil additives, were aimed. For that purpose, the radical-sulfonation and alkali-oxygen treatments of several isolated lignins were accomplished under the various conditions. Here, the radical-sulfonation treatment was developed by the author, by which a sulfonic acid group is introduced into an aromatic nucleus at the ortho-position to a free phenolic hydroxyl group. This is why a radical-sulfonated lignin has been expected to show some characteristic and different nature from a normal lignosulfonate, in which a sulfonic acid group is located at the side chain of lignin.At the first stage of this project, we succeeded to establish the optimum treatment conditions for the radical-sulfonation treatment. At the second stage, the reactivities of various lignins were examined form the standpoints of their structural characteristics. It is very interesting to note that even highly condensed Klason lignin showed a comparable reactivity to kraft lignin. At the third stage, we studied the behaviors of water soluble lignins in aqueous solutions. It was found that these lignins do not exist as single molecules, but exist as aggregates presumably because of the hydrophobic interaction. At the final stage, the effect of these lignins to the growth of young white birch trees. It is too early to conclude at this noment, but a fully radical-sulfonated kraft lignin may have an acceleration effect for the growth of trees.

开发具有特色的新型木质化学品，是实现木材资源综合利用的关键。本研究旨在开发可用作分散剂和土壤添加剂的新型木质素聚电解质。为此，在各种条件下完成了几种分离的木质素的自由基磺化和碱氧处理。在此，作者开发了自由基磺化处理，通过该处理，磺酸基团被引入到游离酚羟基的邻位的芳核中。这就是为什么自由基磺化木质素被期望表现出一些特性和不同于通常的木质素磺酸盐的性质，其中磺酸基团位于木质素的侧链上。在本项目的第一阶段，我们成功地建立了自由基磺化处理的最佳处理条件。在第二阶段，从木质素的结构特征出发，考察了各种木质素的反应性。非常有趣的是，注意到即使是高度浓缩的Klason木质素也显示出与硫酸盐木质素相当的反应性。第三阶段研究了水溶性木质素在水溶液中的行为。结果发现，这些木质素不存在作为单一的分子，但作为聚集体存在，大概是因为疏水相互作用。在生长后期，研究了这些木质素对白色白桦幼树生长的影响。现在下结论还为时过早，但完全自由基磺化的硫酸盐木质素可能对树木的生长有促进作用。