This study was aimed at optimizing the structure and properties of poly(N-isopropylacrylamide) (PNIPAAm) microgels prepared by inverse suspension polymerization. The influence of the oil-to-water phase ratio, the concentration of emulsifier, and the monomer-to-crosslinker molar ratio on selected properties of the PNIPAAm microgels was examined. Regularity of the microgels shape was estimated by optical microscopy. Laser diffraction technique was used to determine the microgels mean size and size distribution. Equilibrium swelling ratio was studied gravimetrically. Morphology of microgels was followed by SEM. Volume phase transition temperature of PNIPAAm microgels was determined by differential scanning calorimetry. The results obtained imply that the mean diameter of microgels and their equilibrium swelling ratio highly depend on the concentration of emulsifier in oil phase and the crosslinking degree of PNIPAAm. The crosslinking degree of PNIPAAm has no substantial effect on the volu...me phase transition temperature that is demonstrated to be around 33 degrees C even after complete heating-cooling-heating cycle. In addition, it was confirmed that the swollen microgels have a porous, honeycomb-like structure. Release profiles of procaine hydrochloride from the PNIPAAm microgels confirmed their potential to be considered as efficient matrices in drug release applications.
TY - JOUR
AU - Petrusić, Stojanka
AU - Jovančić, Petar
AU - Lewandowski, Maryline
AU - Giraud, Stephane
AU - Bugarski, Branko
AU - Đonlagić, Jasna
AU - Koncar, Vladan
PY - 2012
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2178
AB - This study was aimed at optimizing the structure and properties of poly(N-isopropylacrylamide) (PNIPAAm) microgels prepared by inverse suspension polymerization. The influence of the oil-to-water phase ratio, the concentration of emulsifier, and the monomer-to-crosslinker molar ratio on selected properties of the PNIPAAm microgels was examined. Regularity of the microgels shape was estimated by optical microscopy. Laser diffraction technique was used to determine the microgels mean size and size distribution. Equilibrium swelling ratio was studied gravimetrically. Morphology of microgels was followed by SEM. Volume phase transition temperature of PNIPAAm microgels was determined by differential scanning calorimetry. The results obtained imply that the mean diameter of microgels and their equilibrium swelling ratio highly depend on the concentration of emulsifier in oil phase and the crosslinking degree of PNIPAAm. The crosslinking degree of PNIPAAm has no substantial effect on the volume phase transition temperature that is demonstrated to be around 33 degrees C even after complete heating-cooling-heating cycle. In addition, it was confirmed that the swollen microgels have a porous, honeycomb-like structure. Release profiles of procaine hydrochloride from the PNIPAAm microgels confirmed their potential to be considered as efficient matrices in drug release applications.
PB - Springer, Dordrecht
T2 - Journal of Polymer Research
T1 - Synthesis, characterization and drug release properties of thermosensitive poly(N-isopropylacrylamide) microgels
IS - 10
VL - 19
DO - 10.1007/s10965-012-9979-1
ER -
@article{
author = "Petrusić, Stojanka and Jovančić, Petar and Lewandowski, Maryline and Giraud, Stephane and Bugarski, Branko and Đonlagić, Jasna and Koncar, Vladan",
year = "2012",
abstract = "This study was aimed at optimizing the structure and properties of poly(N-isopropylacrylamide) (PNIPAAm) microgels prepared by inverse suspension polymerization. The influence of the oil-to-water phase ratio, the concentration of emulsifier, and the monomer-to-crosslinker molar ratio on selected properties of the PNIPAAm microgels was examined. Regularity of the microgels shape was estimated by optical microscopy. Laser diffraction technique was used to determine the microgels mean size and size distribution. Equilibrium swelling ratio was studied gravimetrically. Morphology of microgels was followed by SEM. Volume phase transition temperature of PNIPAAm microgels was determined by differential scanning calorimetry. The results obtained imply that the mean diameter of microgels and their equilibrium swelling ratio highly depend on the concentration of emulsifier in oil phase and the crosslinking degree of PNIPAAm. The crosslinking degree of PNIPAAm has no substantial effect on the volume phase transition temperature that is demonstrated to be around 33 degrees C even after complete heating-cooling-heating cycle. In addition, it was confirmed that the swollen microgels have a porous, honeycomb-like structure. Release profiles of procaine hydrochloride from the PNIPAAm microgels confirmed their potential to be considered as efficient matrices in drug release applications.",
publisher = "Springer, Dordrecht",
journal = "Journal of Polymer Research",
title = "Synthesis, characterization and drug release properties of thermosensitive poly(N-isopropylacrylamide) microgels",
number = "10",
volume = "19",
doi = "10.1007/s10965-012-9979-1"
}
Petrusić, S., Jovančić, P., Lewandowski, M., Giraud, S., Bugarski, B., Đonlagić, J.,& Koncar, V.. (2012). Synthesis, characterization and drug release properties of thermosensitive poly(N-isopropylacrylamide) microgels. in Journal of Polymer Research
Springer, Dordrecht., 19(10).
https://doi.org/10.1007/s10965-012-9979-1
Petrusić S, Jovančić P, Lewandowski M, Giraud S, Bugarski B, Đonlagić J, Koncar V. Synthesis, characterization and drug release properties of thermosensitive poly(N-isopropylacrylamide) microgels. in Journal of Polymer Research. 2012;19(10).
doi:10.1007/s10965-012-9979-1 .
Petrusić, Stojanka, Jovančić, Petar, Lewandowski, Maryline, Giraud, Stephane, Bugarski, Branko, Đonlagić, Jasna, Koncar, Vladan, "Synthesis, characterization and drug release properties of thermosensitive poly(N-isopropylacrylamide) microgels" in Journal of Polymer Research, 19, no. 10 (2012),
https://doi.org/10.1007/s10965-012-9979-1 . .
