I need to crosslink polyacrylamide without the conventional hydrogel formation. I need it in hard form after crosslinking. Do any irradiation or gaseous permeation will help to achieve this? Thanks in advance!
Dear Srimanta;
use high concentration of N-methylenebisacrylamide as crosslinker. A gel is obtained at low concentration of this latter. Regards
Dear Srimanta.
It seems like you want to to crosslink existing PAAm powder? There are papers in which PAAm is crosslinked by gamma irradiation: The gamma ray-induced crosslinking of polyacrylamide in the solid state, Burillo and Ogawa, JPS C, Polymer Letters, 1983.
Have you considered making your own from monomers as opposed to starting with the polymer?
Do you want crosslinked PAAm powder, or solid crosslinked monolithic blocks/shapes?
You could heat acrylamide monomer in bulk (with some bis-AAm) to above its melting point and add a free radical initiator. For powder you could grind this up. Otherwise (for powder) you could use an emulsion or suspension polymerization system and isolate in powder form, or make a gels freeze dry/grind them up.
Regards, Deon
Thanks Deon Bezuidenhout a lot for your input. You are right, I want the polymer in solid crosslinked form. The as synthesized polymer is extremely hygroscopic, it gets softened absorbing the moisture. The gamma irradiation may be helpful. After crosslinking in this method, will the hygroscopicity go? I do not want the hard polymer to swell again absorbing moisture.
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