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Title: Chemorheology of aqueous-based alumina-poly(vinyl alcohol) gelcasting suspensions

Abstract

A new gelcasting system based on aqueous-based alumina-poly(vinyl alcohol) (PVA) suspensions cross-linked by an organotitanate coupling agent has been developed. The chemorheological properties of this system exhibited a strong compositional dependence. A sol-gel phase diagram was established, which yielded the critical titanium concentration ([Ti]{sub c}) required for gelation at a given PVA volume fraction as well as the minimum PVA volume fraction ({Phi}{sub PVA}{sup min} = 0.0245) and titanium concentration ([Ti]{sub min} = 9.984 {times} 10{sup {minus}4} g of Ti/mL) below which gelation was not observed irrespective of solution composition. The gelation time of suspensions of constant PVA volume fraction ({Phi}{sub PVA}{sup soln}) decreased with increased cross-linking agent concentration, temperature, and solids volume fraction. The steady-state viscosity and elastic modulus of polymer solutions ({Phi}{sub PVA}{sup soln} = 0.05) of varying [Ti] were well described by the percolation model, giving scaling exponents of 0.84 and 1.79, respectively. The steady-state elastic modulus of gel-casting suspensions, which provided a measure of their handling strength in the as-gelled state, increased with increased solids volume fraction.

Authors:
;  [1]
  1. Univ. of Illinois, Urbana, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation, Washington, DC (United States); USDOE, Washington, DC (United States)
OSTI Identifier:
347469
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 82; Journal Issue: 3; Other Information: PBD: Mar 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SOL-GEL PROCESS; ALUMINIUM OXIDES; PVA; ORGANOMETALLIC COMPOUNDS; TITANATES; SUSPENSIONS; PHASE DIAGRAMS; CHEMICAL COMPOSITION; VISCOSITY; ELASTICITY

Citation Formats

Morissette, S L, and Lewis, J A. Chemorheology of aqueous-based alumina-poly(vinyl alcohol) gelcasting suspensions. United States: N. p., 1999. Web. doi:10.1111/j.1151-2916.1999.tb01796.x.
Morissette, S L, & Lewis, J A. Chemorheology of aqueous-based alumina-poly(vinyl alcohol) gelcasting suspensions. United States. https://doi.org/10.1111/j.1151-2916.1999.tb01796.x
Morissette, S L, and Lewis, J A. 1999. "Chemorheology of aqueous-based alumina-poly(vinyl alcohol) gelcasting suspensions". United States. https://doi.org/10.1111/j.1151-2916.1999.tb01796.x.
@article{osti_347469,
title = {Chemorheology of aqueous-based alumina-poly(vinyl alcohol) gelcasting suspensions},
author = {Morissette, S L and Lewis, J A},
abstractNote = {A new gelcasting system based on aqueous-based alumina-poly(vinyl alcohol) (PVA) suspensions cross-linked by an organotitanate coupling agent has been developed. The chemorheological properties of this system exhibited a strong compositional dependence. A sol-gel phase diagram was established, which yielded the critical titanium concentration ([Ti]{sub c}) required for gelation at a given PVA volume fraction as well as the minimum PVA volume fraction ({Phi}{sub PVA}{sup min} = 0.0245) and titanium concentration ([Ti]{sub min} = 9.984 {times} 10{sup {minus}4} g of Ti/mL) below which gelation was not observed irrespective of solution composition. The gelation time of suspensions of constant PVA volume fraction ({Phi}{sub PVA}{sup soln}) decreased with increased cross-linking agent concentration, temperature, and solids volume fraction. The steady-state viscosity and elastic modulus of polymer solutions ({Phi}{sub PVA}{sup soln} = 0.05) of varying [Ti] were well described by the percolation model, giving scaling exponents of 0.84 and 1.79, respectively. The steady-state elastic modulus of gel-casting suspensions, which provided a measure of their handling strength in the as-gelled state, increased with increased solids volume fraction.},
doi = {10.1111/j.1151-2916.1999.tb01796.x},
url = {https://www.osti.gov/biblio/347469}, journal = {Journal of the American Ceramic Society},
number = 3,
volume = 82,
place = {United States},
year = {Mon Mar 01 00:00:00 EST 1999},
month = {Mon Mar 01 00:00:00 EST 1999}
}