Swelling and diffusion behaviour of spherical morphological polymeric hydrogel membranes (SMPHMs) containing epoxy groups and their application as drug release systems

Preparation, Characterization, and Properties of Chitosan‐Based Semi‐Interpenetrating Polymer Networks and Poly(2‐hydroxyethyl methacrylate) Structure

“…PHEMA exhibits a strong peak at 1725 cm −1 , assigned to the ester carboxyl group (C=O stretching); and vibrations in the range 1000-1400 cm −1 which are also assigned to ester vibrations (C-O stretching). [37] CS shows characteristic bands at: 3250 cm −1 , assigned to hydroxyl groups (O-H stretching); 1657 and 1560 cm −1 , assigned to amide I band (C=O stretching) and amide II band (N-H bending), respectively; and 1320 cm −1 , assigned to amide III (C-N stretching). [31,[38][39][40] The spectrum of semi-IPNs CS/PHEMA-4 has broadly the features of PHEMA (owing to the high PHEMA molar ratio) modified by a way of a sharper shoulder/peak in the vicinity of 1600 cm −1 , appearance of a shoulder below 1550 cm −1 , and small shifts in the ester bands in the range 1000-1400 cm −1 .…”

pH-Sensitive Hydrogel Bilayers: Investigation on Transient Swelling-Induced Bending through Analytical and FEM Approaches

“…Considerable attention has been given to the analysis of the finite deformation of hydrogels, including the bending of a block [15,16], torsion, extension, and inflation of hydrogel cylinders [17], inflation of a cylinder [18] and spherical membrane [19,20], have been carried out. One of particular interest in studying hydrogel deformation behaviors is the study of hydrogel-based bilayers and their finite bending triggered by swelling [21].…”