2 research outputs found
Gelcasting Performance of Alumina Aqueous Suspensions with Glycerol Monoacrylate: A New Low-Toxicity Acrylic Monomer
Gelcasting has been extensively studied and applied as a nearnet-
shaping technique for preparing complex ceramic parts.
However, the use of acrylamide as a main component is an important
drawback of this method as it is a hazardous, neurotoxic
compound. In this context, a new low-toxicity monomer, glycerol
monoacrylate, has been synthesized and successfully used
for the gelcasting of ceramic suspensions. The presence of two
hydroxyl groups in a monomer molecule allows the formation
of a polymer network by the monomer polymerization and cooperative
hydrogen bonding without any external crosslinking
agent. The stability and rheological behavior of alumina
gelcasting suspensions containing the new monomer has
been studied by oscillatory measurements under the controlled
deformation mode. The results were compared with those obtained
for commercially available monomers, 2-hydroxyethyl
acrylate and diethylene glycol diacrylate used as a crosslinking
agent, in which case the effect of an initiator and activator was
studied. The gelcasting performance for both the commercial
and the newly synthesized monomers was studied and compared,
showing that the former allows a faster gelation, whereas the
latter leads to more uniform microstructures and higher sintered
densities of up to 99% of TD.Peer reviewe