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Melt‐rheological behavior of high‐solid cement‐in‐polymer dispersions
Author(s) -
Hojczyk Markus,
Weichold Oliver
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32676
Subject(s) - materials science , rheology , volume fraction , shear thinning , composite material , shearing (physics) , polymer , ethylene oxide , cement , viscosity , particle (ecology) , polymer chemistry , chemical engineering , copolymer , geology , oceanography , engineering
The rheological behavior of a series of poly(ethylene oxide) melts containing nonhydrated cement is investigated using stress‐sweep measurements. The influence of the polymer end‐group—diol, monomethyl ether, and dimethyl ether—, molecular weight, and the particle volume fraction is examined. The data suggests that monomethyl ethers adsorb with their single OH group head‐on on the cement surface, which reduces the interparticle friction and the viscosity, but mixtures based on monomethyl ethers exhibit shear‐thickening behavior. The diols cause the formation of hydrogen‐bonded particle networks leading to high viscosities, but these mixtures exhibit shear‐thinning behavior due to the collapse of the network upon shearing. On increasing the particle volume fraction, the samples feature a nonlinear increase in viscosity. Fitting these data indicated that the maximum particle volume fraction is close to the random packing density of spheres and decreases with decreasing shear stress. As coating for glass rovings, the mixtures match the reinforcing performance of solvent‐based systems despite lower cement content. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011