Water absorption of random styrene-co-itaconic acid copolymers.
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초록
내용
In this study, the water uptake of random poly(styrene-co-itaconate) ionomers in which the acid functional groups were partially or fully neutralized with NaOH was investigated. Experimental results showed with increasing the degree of neutralization, the more water was absorbed. It was also found that the higher the mole fraction of itaconic acid monomer in the copolymer, the higher the water absorption. In addition, it was observed that the copolymer or the ionomer did not absorb water any more when the water content reached a certain level. When we considered both the neutralization degree and the acid contents of the copolymer together, we found that, the water uptake of the ionomer was directly and linearly, related to the ion content of the ionomers. Therefore, we can conclude that in the case of carboxylated polystyrene ionomers, water absorption was dependent on the ionic group concentration of the ionomers.