Model compounds-based study on adsorption and dispersion properties of lignin-based superplasticizer

Area of Science:

• Materials Science
• Polymer Chemistry
• Sustainable Chemistry

Background:

• Lignin-based superplasticizers are gaining attention for their chemical modifications.
• Understanding the structure-activity relationship is crucial for advancing lignin superplasticizer research and application.
• Lignin's complex structure hinders detailed structure-activity relationship studies.

Purpose of the Study:

• To investigate the structure-activity relationship of lignin-based superplasticizers using dihydroeugenol as a model compound.
• To synthesize and evaluate a model lignin-based superplasticizer (DAFS) by substituting lignin with dihydroeugenol.
• To compare the performance of DAFS with a reference lignin-based superplasticizer (LAFS).

Main Methods:

• Synthesis of a dihydroeugenol-based superplasticizer (DAFS).
• Evaluation of adsorption and dispersion properties using fluidity tests, Zeta-potential measurements, and Total Organic Carbon (TOC) analysis.
• Analysis of adsorption kinetics and isotherms (Langmuir, Pseudo-second order).

Main Results:

• Both DAFS and LAFS adsorption followed Langmuir isotherms and Pseudo-second order kinetics.
• Zeta potential decreased significantly in cement paste with both DAFS and LAFS, indicating effective dispersion.
• Dihydroeugenol substitution showed no significant impact on dispersive properties but affected rheological properties, requiring future optimization.

Conclusions:

• Dihydroeugenol is a suitable model compound for studying the structure-activity relationship of lignin-based superplasticizers.
• This model approach simplifies research and provides insights for developing new lignin-based superplasticizers.
• The findings contribute to a better understanding of lignin superplasticizer mechanisms and future development.