Semi-IPN hydrogels based on N-Isopropylacrylamide and 2-Hydroxyethyl methacrylate
Corressponding author's email:
tuanhna@hcmute.edu.vnKeywords:
Swelling behavior, swelling ratio, swelling rate, semi-IPN hydrogel, N-isopropyl acrylamide, 2-hydroxyethyl methacrylateAbstract
In this research, two series of smart semi-interpenetrating polymer network (semi-IPN) hydrogels based on N-isopropyl acrylamide (NIPAM) and 2-hydroxyethyl methacrylate (HEMA), including linear p(NIPAM-co-HEMA)/pNIPAM (S1-structure) and linear pNIPAM/p(NIPAM-co-HEMA) (S2-structure) were synthesized and investigated. The morphological, chemical, physical properties and swelling behaviors in water of the linear polymer and semi-IPN hydrogels were investigated. Fourier transform infrared (FTIR) spectra confirmed the polymerization/copolymerization ability of monomer/comonomer. Differential scanning calorimetry (DSC) determined the thermal sensitivity of polymer materials with a value of lower critical solution temperature (LCST) in the range of 31.80 ~ 32.80 °C and 33.40 ~ 35.00 °C, respectively for linear polymers and hydrogels. The value of LCST depended only on the composition of feeding material, not on the structure of the material. Scanning electronic microscopy (SEM) images showed that the pore size was in the range of 140.16 ± 19.71 ~ 275.51 ± 62.07 µm. The swelling ratio and swelling rate of semi-IPN hydrogel increased significantly compared to conventional hydrogel. In addition, S1-structure hydrogels showed a faster swelling rate than S2-structure hydrogel.Downloads: 0
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