Jeong, Yoon-Gwan Park, Seok-Young Kim, Joon-Seop Lee, Yeonhee 2024-01-19T10:02:10Z 2024-01-19T10:02:10Z 2023-03-16 2023-03 1598-5032 https://pubs.kist.re.kr/handle/201004/113950 In this study, the water absorption of poly(styrene-co-itaconate) PSITNa ionomers, having two ion pairs in an ionic repeat unit, was investigated. Plotting the water absorption data as a function of the ionic repeat unit content revealed that the PSITNa ionomer exhibited more water uptake than the poly(styrene-co-methacrylate) PSMANa ionomer, having one Na-carboxylate ion pair per ionic repeat unit. On the other hand, when the water absorption data were simply expressed as a function of the ion content, it was found that the PSMANa ionomer showed more water absorption than the PSITNa ionomer. These results and the SAXS results suggested that to increase the degree of water absorption of the ionomer, it would be better for the ion pairs of the ionomer to form aggregates with other ion pairs rather than to exist alone in the matrix. In addition, it was observed that the degree of water absorption of the ionomer gradually improved as the size of the cation used for neutralization of the ionomer increased. These results and morphological results indicated that when the strength of interaction between ion pairs was weakened, the number of ionic aggregates decreased, and, at the same time, the ionic aggregates readily absorbed water due to weak interaction between ion pairs in the aggregates. (GRAPHICS) English 한국고분자학회 Relationship between the chemical structure, morphology, and water absorption of styrene-co-itaconate ionomers Article 10.1007/s13233-023-00139-4 1 Macromolecular Research, v.31, no.3, pp.245 - 255 Macromolecular Research 31 3 245 255 N scie scopus kci ART002941566 000937068200001 2-s2.0-85148505069 Polymer Science Polymer Science Article; Early Access X-RAY-SCATTERING POLY(STYRENE-RAN-METHACRYLIC ACID) IONOMERS DYNAMIC-MECHANICAL PROPERTIES ION-EXCHANGE MEMBRANES CLUSTER FORMATION ANGLE ETHYLENE MODEL NEUTRALIZATION RELAXATION Ionomer Water absorption Ionic aggregate Morphology Cations