Solution properties of lignin. Thermodynamic properties and molecular weight determinations
Solution properties of lignin. Thermodynamic properties and molecular weight determinations
复制标题
木质素的溶液性质。
DOI：
--
复制
发表时间：
1967
期刊：
影响因子：
--
通讯作者：
W. Brown
中科院分区：
文献类型：
--
作者：
W. Brown
测定了木质素在二甲基亚砜、二甲基甲酰胺和二氧六环溶剂中的数均分子量和热力学参数ΔF1、ΔH1和ΔS1。在不同的溶剂和不同的温度下，发现作为分子缔合的结果，分子量有很大的不同。热力学参数的分析表明，这些量是由溶剂结构的变化，伴随着溶液过程中占主导地位。因此，在这种系统中，木质素溶剂的“优度”与希尔德布兰德溶解度参数之间的相关性是误导性的。
Number-average molecular weights and the thermodynamic parameters ΔF1, ΔH1, and ΔS1 have been obtained for lignin in the solvents dimethylsulfoxide, dimethyl-formamide, and dioxane. Widely different molecular weights were found in the different solvents and at the different temperatures as a consequences of molecular association. Analysis of the thermodynamic parameters revealed that these quantities are dominated by the change in solvent structure accompanying the solution process. A correlation between the “goodness” of a lignin solvent and the Hildebrand solubility parameter is consequently misleading in such systems.