Interactions between cellulose nanocrystals and anionic and neutral polymers in aqueous solutions

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/s10570-016-1096-6
AuthorSearch for: 1; Search for: 1
Name affiliation
  1. National Research Council of Canada. Nanotechnology
FormatText, Article
Journal titleCellulose
ISSN0969-0239
1572-882X
Volume24
Issue1
Pages131–146
Subjectdepletion; adsorption; polymer; cellulose nanocystals
Abstract
Physical structures of aqueous cellulose nanocrystal (CNC) suspensions in anionic polyelectrolyte carboxymethyl cellulose (CMC) and non-ionic poly(ethylene oxide) (PEO) were investigated by studying their cross polarized, polarized optical microscope (POM) images and dynamic light scattering, zeta potential, 1H spin–lattice relaxation nuclear magnetic resonance (NMR) data. The presence of anionic CMC and nonionic PEO in CNC suspensions led to two different kind of interactions. Semi-dilute CNC suspensions showed first gel-like behavior then phase separation by adding only semi-dilute un-entangled CMC polymer solutions, whereas the addition of PEO didn’t cause any significant change. POM images showed the phase transitions of CNC suspensions in the presence of CMC solutions from the isotropic state to nematic and chiral nematic phases. Dynamic light scattering, zeta potential and 1H spin–lattice relaxation NMR data presented further arguments to explain polymer-CNC interactions in CMC and PEO solutions. 1H NMR solvent relaxation technique determined the adsorption and depletion interactions between polymers and CNC. The minima in spin–spin specific relaxation rate constant showed the depletion of CNC nanoparticles in CMC. It is believed that the depletion flocculation was the case for the effects of CMC polymer chains in CNC suspensions. PEO was adsorbed on CNC surfaces and caused only weak depletion interactions due to the presence of soft particles.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number23003135
Export citationExport as RIS
Report a correctionReport a correction
Record identifier5a2e96e8-331c-496d-9a91-c1500c8f3538
Record created2018-04-27
Record modified2020-03-16
Report a problem on this page
Date modified: