What is the effect of adding polyvinyl alcohol to acrylic acid and acrylamide on swelling, viscosity and cross linking?
What I understood is that you have a polymer "PVA" & 2 monomers "acrylic acid + acrylamide" & you wanted to mix them all to see the effect upon the polymer. My answer according to this perception is:
The polymer & the 2 monomers are all water-soluble. Adding these 2 simple compounds to poly(vinyl alcohol) is expected to : 1) Increase the degree of swelling for the polymer. 2) Increase the viscosity of the polymer solution. 3) Increase the amount of intermolecular hydrogen bonding since the 3 species can be involved. Poly(vinyl alcohol) can have intramolecular crosslinking by aldehydes "such as butanal" to form what is commercially known as Butvar but the acrylic acid & the acrylamide cannot do that.
Structure of Butvar is attached below.
Dear Mostafa;
these three polymers may exhibit some compatibility. If the preparation procedure is efficient, you may end up with an IPN. The properties you want to predict are function of how dual these combination is dominant, and on the other hand the crosslink density. Regards
What I understood is that you have a polymer "PVA" & 2 monomers "acrylic acid + acrylamide" & you wanted to mix them all to see the effect upon the polymer. My answer according to this perception is:
The polymer & the 2 monomers are all water-soluble. Adding these 2 simple compounds to poly(vinyl alcohol) is expected to : 1) Increase the degree of swelling for the polymer. 2) Increase the viscosity of the polymer solution. 3) Increase the amount of intermolecular hydrogen bonding since the 3 species can be involved. Poly(vinyl alcohol) can have intramolecular crosslinking by aldehydes "such as butanal" to form what is commercially known as Butvar but the acrylic acid & the acrylamide cannot do that.
Structure of Butvar is attached below.
Since acrylamide and acrylic acid are acceptors of hydrogen bond, the substances can, to some extent, self-assemble on PVA macromolecules. The effect of self-assembling on PVA swelling and viscosity will not be, however, big. Even polymeric N,N-dimethylacrylamide added to PVA solution at high concentrations caused a relatively slight increase in viscosity, see the attached paper, Fig.4a, line 3. Acrylic acid and acrylamide can not act as cross-linkers of PVA unless a radical initiator is added.
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