scholarly journals Synthesis and Investigation of Thermo-Induced Gelation of Partially Cross-Linked Poly-2-isopropyl-2-oxazoline in Aqueous Media

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 698 ◽  
Author(s):  
Alina Amirova ◽  
Serafim Rodchenko ◽  
Mikhail Kurlykin ◽  
Andrey Tenkovtsev ◽  
Illia Krasnou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Aqueous Media ◽  
Water Soluble ◽  
Thermally Induced ◽  
Thermosensitive Gel ◽  
Step Procedure ◽  
Physical Gel ◽  
Sol Gel Transition ◽  
Gel Transition

Water-soluble, partially cross-linked poly-2-isopropyl-2-oxazoline combining the properties of chemical and physical gels was synthesized by a two-step procedure. Thermally induced sol-gel transition in its aqueous solution was studied by rheology, light scattering, and turbidimetry. It was demonstrated that the synthesized product is bimodal; it consists of linear and cross-linked components. The cross-linked components are responsible for the gelation, while the linear ones abate the viscosity growth. Heating the solution above the phase transition temperature leads to the self-assembly of the particles into a physical gel. The combination of chemical and physical cross-linking was found to be a prospective route for thermosensitive gel development.

scholarly journals The Synthesis of a Novel Cellulose Physical Gel

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Jiufang Duan ◽  
Xiaojian Zhang ◽  
Jianxin Jiang ◽  
Chunrui Han ◽  
Jun Yang ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Sol Gel ◽  
Material Structure ◽  
Scanning Calorimetry ◽  
Stimulus Responsive ◽  
Physical Gel ◽  
Sol Gel Transition ◽  
Contact Angle Analysis ◽  
Cellulose Concentration ◽  
Gel Transition

Cellulose possessingβ-cyclodextrin (β-CD) was used as a host molecule and cellulose possessing ferrocene (Fc) as a guest polymer. Infrared spectra, differential scanning calorimetry (DSC), ultraviolet spectroscopy (UV), and contact angle analysis were used to characterise the material structure and the inclusion behaviour. The results showed that theβ-CD-cellulose and the Fc-cellulose can form inclusion complexes. Moreover, ferrocene oxidation, and reduction of state can be adjusted by sodium hypochlorite (NaClO) as an oxidant and glutathione (GSH) as a reductant. In this study, a physical gel based onβ-CD-cellulose/Fc-cellulose was formed under mild conditions in which autonomous healing between cut surfaces occurred after 24 hours. The physical gel can be controlled in the sol-gel transition. The compressive strength of the Fc-cellulose/β-CD-cellulose gel increased with increased cellulose concentration. The host-guest interaction between the side chains of cellulose could strengthen the gel. The cellulose physical gel may eventually be used as a stimulus-responsive, healing material in biomedical applications.

Nile red fluorescence for quantitative monitoring of micropolarity and microviscosity of pluronic F127 in aqueous media

2016 ◽  
Vol 15 (11) ◽  
pp. 1400-1407 ◽  
Author(s):  
Jitendriya Swain ◽  
Ashok Kumar Mishra
Keyword(s):  
Sol Gel ◽  
Aqueous Media ◽  
Nile Red ◽  
Pluronic F127 ◽  
Decay Kinetics ◽  
Quantitative Monitoring ◽  
Nile Red Fluorescence ◽  
Sol Gel Transition ◽  
Kinetics Of ◽  
Gel Transition

The photophysical behaviour and excited state decay kinetics of the fluorescent probe Nile red were used for quantitative monitoring of micropolarity, microviscosity and the sol–gel transition temperature of a copolymer hydrogel, pluronic F127.

scholarly journals Direct Observation of Photo‐Induced Reversible Sol–Gel Transition in Block Copolymer Self‐Assembly Containing an Azobenzene Ionic Liquid

2021 ◽  
Vol 42 (10) ◽  
pp. 2170040
Author(s):  
Haruna Mizuno ◽  
Kei Hashimoto ◽  
Keisuke Shigenobu ◽  
Hisashi Kokubo ◽  
Kazuhide Ueno ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Block Copolymer ◽  
Direct Observation ◽  
Self Assembly ◽  
Sol Gel ◽  
Sol Gel Transition ◽  
Gel Transition

Hierarchical Sol–Gel Transition Induced by Thermosensitive Self-Assembly of an ABC Triblock Polymer in an Ionic Liquid

2016 ◽  
Vol 49 (4) ◽  
pp. 1414-1423 ◽  
Author(s):  
Yuzo Kitazawa ◽  
Takeshi Ueki ◽  
Lucas D. McIntosh ◽  
Saki Tamura ◽  
Kazuyuki Niitsuma ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Self Assembly ◽  
Sol Gel ◽  
Triblock Polymer ◽  
Sol Gel Transition ◽  
Gel Transition
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