Volume phase transition of a polymer gel induced by phase separation of mixed solvents of water and 2-butoxyethanol

2018 ◽  
Vol 135 (23) ◽  
pp. 46366 ◽  
Author(s):  
Taiyo Kobayashi ◽  
Jun-ichi Horinaka ◽  
Toshikazu Takigawa
Keyword(s):  
Phase Transition ◽  
Phase Separation ◽  
Mixed Solvents ◽  
Volume Phase Transition ◽  
Polymer Gel ◽  
Volume Phase

Discontinuous Binding of Surfactants to a Polymer Gel Resulting from a Volume Phase Transition

1999 ◽  
Vol 32 (25) ◽  
pp. 8589-8594 ◽  
Author(s):  
Yasuyuki Murase ◽  
Tomohiro Onda ◽  
Kaoru Tsujii ◽  
Toyoichi Tanaka
Keyword(s):  
Phase Transition ◽  
Volume Phase Transition ◽  
Polymer Gel ◽  
Volume Phase

Volume phase transition of polymer gel in water and heavy water

1998 ◽  
Vol 238 (3) ◽  
pp. 487-494 ◽  
Author(s):  
Hideaki Shirota ◽  
Noriko Endo ◽  
Kazuyuki Horie
Keyword(s):  
Phase Transition ◽  
Heavy Water ◽  
Volume Phase Transition ◽  
Polymer Gel ◽  
Volume Phase

Volume phase transition of electron beam cross-linked thermo-responsive PVME nanogels in the presence and absence of nanoparticles: with a view toward rheology and interactions

RSC Advances ◽  
2016 ◽  
Vol 6 (12) ◽  
pp. 9693-9708 ◽  
Author(s):  
Ashkan Shoja Chaykar ◽  
Fatemeh Goharpey ◽  
Jafar Khademzadeh Yeganeh
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Phase Separation ◽  
Radiation Dose ◽  
Phase Behavior ◽  
Separation Mechanism ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
Presence And Absence ◽  
Phase Separation Mechanism

We investigate the effect of nanoparticles and radiation dose on interactions in the PVME-based nanogel system and its phase behavior (swelling/deswelling behavior and phase separation mechanism) by rheological and FTIR measurements.

Anomalous volume phase transition in a polymer gel with alternative hydrophilic–amphiphilic sequence

Soft Matter ◽  
2012 ◽  
Vol 8 (26) ◽  
pp. 6876 ◽  
Author(s):  
Hiroyuki Kamata ◽  
Ungil Chung ◽  
Mitsuhiro Shibayama ◽  
Takamasa Sakai
Keyword(s):  
Phase Transition ◽  
Volume Phase Transition ◽  
Polymer Gel ◽  
Volume Phase

Triply-responsive OEG-based microgels and hydrogels: Regulation of swelling ratio, volume phase transition temperatures and mechanical properties

2021 ◽  
Author(s):  
Dongdong Lu ◽  
Mingning Zhu ◽  
Jing Jin ◽  
Brian R. Saunders
Keyword(s):  
Phase Transition ◽  
Biomedical Engineering ◽  
Volume Phase Transition ◽  
Swelling Ratio ◽  
Transition Temperatures ◽  
Ph Responsive ◽  
Network Systems ◽  
Volume Phase ◽  
Phase Transition Temperatures ◽  
Volume Swelling

Thermally- and pH-responsive microgels (MGs) and hydrogels are fascinating network systems that have been applied in biomedical engineering and sensing. The volume-swelling ratio (Q) and the volume-phase transition temperatures (VPTTs)...

scholarly journals Accounting for Cooperativity in the Thermotropic Volume Phase Transition of Smart Microgels

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 42
Author(s):  
Simon Friesen ◽  
Yvonne Hannappel ◽  
Sergej Kakorin ◽  
Thomas Hellweg
Keyword(s):  
Phase Transition ◽  
Interaction Parameter ◽  
Quantitative Description ◽  
Water Molecules ◽  
Volume Phase Transition ◽  
Network Chain ◽  
Solvent Interaction ◽  
Volume Phase ◽  
The Cross ◽  
Interaction Parameter Χ

A full quantitative description of the swelling of smart microgels is still problematic in many cases. The original approach of Flory and Huggins for the monomer–solvent interaction parameter χ cannot be applied to some microgels. The reason for this obviously is that the cross-linking enhances the cooperativity of the volume phase transitions, since all meshes of the network are mechanically coupled. This was ignored in previous approaches, arguing with distinct transition temperatures for different meshes to describe the continuous character of the transition of microgels. Here, we adjust the swelling curves of a series of smart microgels using the Flory–Rehner description, where the polymer–solvent interaction parameter χ is modeled by a Hill-like equation for a cooperative thermotropic transition. This leads to a very good description of all measured microgel swelling curves and yields the physically meaningful Hill parameter ν. A linear decrease of ν is found with increasing concentration of the cross-linker N,N′-methylenebisacrylamide in the microgel particles p(NIPAM), p(NNPAM), and p(NIPMAM). The linearity suggests that the Hill parameter ν corresponds to the number of water molecules per network chain that cooperatively leave the chain at the volume phase transition. Driven by entropy, ν water molecules of the solvate become cooperatively “free” and leave the polymer network.

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