Titel
Fabrication of graded porous structure of hydroxypropyl cellulose hydrogels via temperature-induced phase separation
Autor*in
Zahraa H. Athab
University of Babylon, College of Science, Department of Chemistry, Hilla, Iraq
... show all
Abstract
A novel hydroxypropyl cellulose (gHPC) hydrogel with graded porosity has been fabricated, in which pore size, shape, and mechanical properties vary across the material. The graded porosity was achieved by cross-linking different parts of the hydrogel at temperatures below and above 42 °C, which was found to be the temperature of turbidity onset (lower critical solution temperature, LCST) for the HPC and divinylsulfone cross-linker mixture. Scanning electron microscopy imaging revealed a decreasing pore size along the cross-section of the HPC hydrogel from the top to the bottom layer. HPC hydrogels demonstrate graded mechanical properties whereby the top layer, Zone 1, cross-linked below LCST, can be compressed by about 50% before fracture, whereas the middle and bottom layers (Zone 2 and 3, respectively) cross-linked at 42 °C, can withstand 80% compression before failure. This work demonstrates a straightforward, yet novel, concept of exploiting a graded stimulus to incorporate a graded functionality into porous materials that can withstand mechanical stress and minor elastic deformations.
Stichwort
Gradient porous materialHydroxypropyl celluloseHPCLCSTThermoresponsive hydrogelsGraded porous hydrogels
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1652322
Erschienen in
Titel
Carbohydrate Polymers
Band
315
ISSN
0144-8617
Erscheinungsdatum
2023
Publication
Elsevier BV
Fördergeber
Europäische Union (alle Programme) — 101002176
Erscheinungsdatum
2023
Zugänglichkeit
Rechte
Rechteangabe
© 2023 The Authors
Universität Wien | Universitätsring 1 | 1010 Wien | T
+43-1-4277-0