Skip to main content
Log in

Dynamic rheological behavior of DBS-induced poly(propylene glycol) physical gels

  • ORIGINAL CONTRIBUTION
  • Published:
Rheologica Acta Aims and scope Submit manuscript

Abstract

Physical gelation can be induced in various organic and silicone-based liquids, as well as in polymeric melts, upon addition of 1,3:2,4-dibenzylidene sorbitol (DBS). Such gels are stabilized by the formation of a percolated DBS network composed of highly interconnected nanofibrils. In this study, we explore several factors affecting the rheological properties of poly(propylene glycol) (PPG) gelled by DBS. To ascertain the effect of PPG molecular weight (MPPG) on gel formation and rheology, we have investigated three series of DBS-induced PPG gels in which MPPG varies from 425 g/mol to 4000 g/mol. Dynamic stress measurements reveal that the DBS concentration identifying the onset of PPG gelation decreases with increasing MPPG. Since the solubility parameter (δs) of PPG decreases sharply as MPPG increases over this MPPG range, this observation suggests that DBS gelation is sensitive to δs of the matrix liquid, in agreement with previously reported data collected from DBS-gelled solvents. Moreover, the elastic modulus and yield stress are found to increase with increasing (i) DBS concentration for the three series of PPG/DBS gels examined here and (ii) recovery time after cessation of an introductory shear.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Author information

Authors and Affiliations

Authors

Additional information

Received: 22 February 2000 Accepted: 9 August 2000

Rights and permissions

Reprints and permissions

About this article

Cite this article

Mercurio, D., Khan, S. & Spontak, R. Dynamic rheological behavior of DBS-induced poly(propylene glycol) physical gels. Rheol. Acta 40, 30–38 (2001). https://doi.org/10.1007/s003970000119

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/s003970000119

Navigation