Hysteresis in the thermally induced phase transition of cellulose ethers

Navid Bizmark, Nicholas J. Caggiano, Jason X. Liu, Craig B. Arnold, Robert K. Prud’homme, Sujit S. Datta, Rodney D. Priestley

Research output: Contribution to journalArticlepeer-review

Abstract

Functionalized cellulosics have shown promise as naturally derived thermoresponsive gelling agents. However, the dynamics of thermally induced phase transitions of these polymers at the lower critical solution temperature (LCST) are not fully understood. Here, with experiments and theoretical considerations, we address how molecular architecture dictates the mechanisms and dynamics of phase transitions for cellulose ethers. Above the LCST, we show that hydroxypropyl substituents favor the spontaneous formation of liquid droplets, whereas methyl substituents induce fibril formation through diffusive growth. In celluloses which contain both methyl and hydroxypropyl substituents, fibrillation initiates after liquid droplet formation, suppressing the fibril growth to a sub-diffusive rate. Unlike for liquid droplets, the dissolution of fibrils back into the solvated state occurs with significant thermal hysteresis. We tune this hysteresis by altering the content of substituted hydroxypropyl moieties. This work provides a systematic study to decouple competing mechanisms during the phase transition of multi-functionalized macromolecules.

Original languageEnglish (US)
Pages (from-to)6254-6263
Number of pages10
JournalSoft matter
Volume18
Issue number33
DOIs
StatePublished - Aug 3 2022

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Hysteresis in the thermally induced phase transition of cellulose ethers'. Together they form a unique fingerprint.

Cite this