The chemical modifications of lignin-based superplasticizers have attracted extensive attentions during recent years. The comprehending of the structure-activity relationship of lignin-based superplasticizer is important to promote the modification and application research of lignin resources. However, lignin features complex and variable molecular structure, which is not conducive to study on structure-activity relationship of lignin-based superplasticizer as well as development and application of new lignin-based superplasticizer. However, the related research work can be simplified by selecting small molecular compound with appropriate molecular structure as the lignin model compound. This article intends to study the structure-activity relationship of lignin-based superplasticizer by using dihydroeugenol as the lignin model compound. Through the substitution of lignin by dihydroeugenol during the synthesis process, a model compound lignin-based superplasticizer (DAFS) was synthesized. The adsorption and dispersion properties of this superplasticizer and reference sample (LAFS) were investigated by fluidity test, Zeta-potential measurement, Total organic carbon analysis and others. The results suggest that the adsorption behavior of both DAFS and LAFS conformed to the Langmuir isotherms and Pseudo-second order kinetic. In cement paste, added with 1 g/L of LAFS and DAFS, Zeta potential were reduced from +3.5 to −15.2 mV and −18.7 mV, respectively. The substitution of lignin by dihydroeugenol has no significantly influence on the dispersive property, but differences on rheological properties which need to be optimized in the future. All the tests confirmed that dihydroeugenol is suitable to replace lignin on exploring the structure-activity relationship of lignin-based superplasticizer. This research work provides new insight on model study of lignin-based superplasticizer.

近年来，木质素基高效减水剂的化学改性引起了广泛的关注。认识木质素系高效减水剂的构效关系对于促进木质素资源的改性和应用研究具有重要意义。然而，木质素分子结构复杂多变，不利于木质素系高效减水剂构效关系的研究以及新型木质素系高效减水剂的开发和应用。然而，通过选择具有适当分子结构的小分子化合物作为木质素模型化合物，可以简化相关的研究工作。本文拟以二氢丁子香酚为木质素模型化合物，研究木质素基高效减水剂的构效关系。通过在合成过程中用二氢丁香酚替代木质素，合成了模型化合物木质素基高效减水剂（DAFS）。通过流动性测试、Zeta电位测量、总有机碳分析等研究了该高效减水剂和参考样品（LAFS）的吸附和分散性能。结果表明，DAFS和LAFS的吸附行为均符合Langmuir等温线和准二级动力学。在水泥浆中，添加1 g/L的LAFS和DAFS，Zeta电位分别从+ 3.5降低至-15.2 mV和-18.7 mV。二氢丁香酚替代木质素对分散性能没有显着影响，但流变性能存在差异，需要进一步优化。所有试验均证实二氢丁香酚适合替代木质素，探索木质素基高效减水剂的构效关系。该研究工作为木质素基高效减水剂的模型研究提供了新的见解。