Aggregation induced emission based fluorescence pH and temperature sensors: probing polymer interactions in poly(N-isopropyl acrylamide-co-tetra(phenyl)ethene acrylate)/poly(methacrylic acid) interpenetrating polymer networks

2015 ◽  
Vol 3 (21) ◽  
pp. 5490-5498 ◽  
Author(s):  
Hui Zhou ◽  
Feng Liu ◽  
Xiaobai Wang ◽  
Hong Yan ◽  
Jing Song ◽  
...  
Keyword(s):  
Methacrylic Acid ◽  
Polymer Networks ◽  
Temperature Sensors ◽  
Interpenetrating Polymer Networks ◽  
Aggregation Induced Emission ◽  
Isopropyl Acrylamide ◽  
Polymer Interactions

Aggregation induced emission active tetra(phenyl)ethene units are incorporated into poly(N-isopropyl acrylamide) to be used as a probe for interpenetrating polymer networks.

scholarly journals Thermo-responsive hydrogels based on poly(N-isopropyl-acrylamide) and hyaluronic acid cross-linked with nanoclays

2020 ◽  
Vol 85 (9) ◽  
pp. 1197-1221 ◽  
Author(s):  
Ilinka Mirkovic ◽  
Marija Nikolic ◽  
Sanja Ostojic ◽  
Jelena Maletaskic ◽  
Zoran Petrovic ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Water Soluble ◽  
Nanocomposite Hydrogels ◽  
Dsc Measurements ◽  
Isopropyl Acrylamide ◽  
Hydrogel Network ◽  
Responsive Hydrogels

Semi-interpenetrating polymer networks (SIPN) based on thermoresponsive poly(N-isopropylacrylamide) (PNIPA) and water-soluble sodium salts of linear hyaluronic acid (Na-HA) were physically cross-linked with synthetic nanoclay (laponite XLG). PNIPA hydrogels with different cross-linking densities and Na-HA concentrations were synthesized by in situ free-radical redox polymerization. The structure and heterogeneity of the semi-IPN hydrogels were examined by SEM and XRD. The content of clay incorporated in the gel was determined by TGA. DSC measurements showed that volume phase transition temperature and its enthalpy varied with the clay and hyaluronic acid content. SIPN hydrogels containing negatively charged polyelectrolyte, Na- HA, exhibited higher Qe and faster deswelling rates than the corresponding PNIPA NC hydrogels. The presence of the anionic Na-HA polymer reduced the storage modulus, indicating a weakening of the hydrogel network structure, especially at lower clay contents. The nanocomposite hydrogels exhibited high tan ? values, which increased with increasing Na-HA content.

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