Cellulose nanocrystal dispersions conjugated with symmetric and asymmetric dialkylamine groups
Artikel i vetenskaplig tidskrift, 2024

The present study discusses the effect of symmetric and asymmetric grafting on the surface of CNCs (cellulose nanocrystals) on their dispersion properties using dialkyl azetidinium salts. Three dialkylamine of different size and chain length were successfully grafted to the sulfate groups on the surface of CNCs by conjugation of azetidinium salts. The coupling process resulted in the formation of 2-hydroxypropyl-N-dialkylamine conjugated to the CNC sulfate groups abbreviated as Cn-N-Cm-Prop-2-OH-CNC, where m, n are the number of carbons in the alkyl groups, each with a total of m+n=12, with (m,n)=(11,1);(9,3);(6,6). Molecular dynamics simulations were used to assess the probable morphology of the grafted chains and the interaction potential between CNCs. Steady shear simultaneously combined with polarized light imaging and oscillatory shear rheological measurements were used to evaluate for the first time the impact of the CNC surface modifications on their dispersion flow and optical properties. Overall, the results show that the different linker topologies could effectively promote different types of aggregation morphologies based on the size of the linker, their flexibility and their most probable conformation.

Rheo - polarized light imaging

Molecular modeling

Surface modification

Cellulose nanocrystals

Rheology

Författare

Sylwia Wojno

Wallenberg Wood Science Center (WWSC)

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Amit Kumar Sonker

Wallenberg Wood Science Center (WWSC)

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Teknologian Tutkimuskeskus (VTT)

Mohit Garg

Wallenberg Wood Science Center (WWSC)

Linköpings universitet

Sahana Cooper

Student vid Chalmers

Mikael Rigdahl

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

M. Linares

Linköpings universitet

Igor Zozoulenko

Wallenberg Wood Science Center (WWSC)

Linköpings universitet

Roland Kádár

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Wallenberg Wood Science Center (WWSC)

Gunnar Westman

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Cellulose

0969-0239 (ISSN) 1572882x (eISSN)

Vol. 31 11 6705-6718

Ämneskategorier

Fysikalisk kemi

DOI

10.1007/s10570-024-05900-1

Mer information

Senast uppdaterat

2024-08-17