Chun, Myung-Suk Lee, Dae-Young 2024-01-20T08:03:16Z 2024-01-20T08:03:16Z 2021-09-04 2015-01 0253-2964 https://pubs.kist.re.kr/handle/201004/125964 Water sorption and diffusion are essential physicochemical properties of a high-performance super absorbent polymer (SAP). We combine the Park model with the obstruction-scaling model and the water clustering in confined spaces of the polymer hydrogel. Special attention is focused on elucidating the effect of chain stiffness by considering the conformation of the polymer chain. Theoretical model parameters are determined from the best fits by simultaneous nonlinear regressions for both sorption and corrected diffusion data based on previous experiments with poly(acrylamide-co-sodium acrylate) hydrogel. Predictions show that the hindered water diffusivity leads to a sigmoid curve with relative humidity a(w), where it increases monotonically up to a(w) approximate to 0.6 due to the swelling but decreases at higher aw caused by water clustering. Water diffusion decreases with increasing chain stiffness, and the larger persistence length provides a smaller opening radius in void spaces regarding the weak elastic deformation of hydrogel under the applied stress. English WILEY-V C H VERLAG GMBH OBSTRUCTION-SCALING MODEL HYDROGELS TRANSPORT SUSPENSION FLAX GELS Water Sorption and Hindered Diffusion with Different Chain Stiffness of Superabsorbent Polymer Article 10.1002/bkcs.10062 1 BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.36, no.1, pp.269 - 275 BULLETIN OF THE KOREAN CHEMICAL SOCIETY 36 1 269 275 scie scopus kci ART001956969 000353568200043 2-s2.0-84921926701 Chemistry, Multidisciplinary Chemistry Article OBSTRUCTION-SCALING MODEL HYDROGELS TRANSPORT SUSPENSION FLAX GELS Water sorption Hindered diffusion Polymer hydrogel Chain stiffness Obstruction-scaling