scholarly journals 3D shape change of multi-responsive hydrogels based on a light-programmed gradient in volume phase transition

2018 ◽  
Vol 54 (77) ◽  
pp. 10909-10912 ◽  
Author(s):  
Zhen Jiang ◽  
Ronny Javier Pibaque Sanchez ◽  
Idriss Blakey ◽  
Andrew K. Whittaker
Keyword(s):  
Phase Transition ◽  
Ethylene Glycol ◽  
Shape Change ◽  
Deformation Behaviour ◽  
Volume Phase Transition ◽  
Glycol Methacrylate ◽  
Volume Phase ◽  
New Type ◽  
3D Deformation ◽  
Responsive Hydrogels

We present a new type of anisotropic oligo(ethylene glycol) methacrylate hydrogel with multi-responsive and programmable 3D deformation behaviour.

A redox-labile poly(oligo(ethylene glycol)methacrylate)-based nanogel with tunable thermosensitivity for drug delivery

2016 ◽  
Vol 7 (10) ◽  
pp. 1913-1921 ◽  
Author(s):  
Yefei Tian ◽  
Shanshan Bian ◽  
Wuli Yang
Keyword(s):  
Phase Transition ◽  
Drug Delivery ◽  
Transition Temperature ◽  
Ethylene Glycol ◽  
Phase Transition Temperature ◽  
Precipitation Polymerization ◽  
Volume Phase Transition ◽  
Glycol Methacrylate ◽  
Volume Phase ◽  
Volume Phase Transition Temperature

We developed a redox degradable P(MEO2MA-s-s-OEGMA) nanogel with tunable volume phase transition temperature for drug delivery via precipitation polymerization using a disulfide-containing crosslinker.

Volume phase transition mechanism of poly[oligo(ethylene glycol)methacrylate] based thermo-responsive microgels with poly(ionic liquid) cross-linkers

2015 ◽  
Vol 17 (38) ◽  
pp. 25525-25535 ◽  
Author(s):  
Yuanyuan Zhou ◽  
Hui Tang ◽  
Peiyi Wu
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Fourier Transform ◽  
Ethylene Glycol ◽  
Cross Linking ◽  
Volume Phase Transition ◽  
Glycol Methacrylate ◽  
Volume Phase ◽  
Transition Mechanism ◽  
Poly Ionic Liquid

Thermodynamic volume phase transition mechanisms of poly[oligo(ethylene glycol)methacrylate] (POEGMA) microgels with poly(ionic liquid) (PIL) cross-linking moieties were investigated in detail on the basis of Fourier transform infrared (FTIR) spectroscopy.

Molecular thermodynamic model for swelling behavior and volume phase transition of multi-responsive hydrogels

2011 ◽  
Vol 312 ◽  
pp. 106-115 ◽  
Author(s):  
Dongyan Zhi ◽  
Yongmin Huang ◽  
Shouhong Xu ◽  
Honglai Liu ◽  
Ying Hu
Keyword(s):  
Phase Transition ◽  
Thermodynamic Model ◽  
Swelling Behavior ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
Responsive Hydrogels

Synthesis of Thermoresponsive Copolymers Composed of Poly(ethylene oxide) and Poly(N-isopropylacrylamide) for Cell Encapsulation

2008 ◽  
Vol 1134 ◽  
Author(s):  
Tatiya Trongsatitkul ◽  
Bridgette Budhlall
Keyword(s):  
Phase Transition ◽  
Ethylene Glycol ◽  
Laser Scanning ◽  
Cell Encapsulation ◽  
Effect Of Temperature ◽  
Solution Temperature ◽  
Volume Phase Transition ◽  
Poly Ethylene Glycol ◽  
Volume Phase ◽  
Poly Ethylene

AbstractThermoresponsive copolymers of poly(N- isopropyl acrylamide) (PNIPAm) and poly(acrylamide) microgels grafted with poly(ethylene glycol)(PEG) chains were synthesized by free-radical photopolymerization. Poly(ethylene glycol) methyl ether methacrylate (PEGMA) macromonomers with varying number-average molecular weights were used (Mn = 300 and 1,000 g/mol). A simple microarray technique coupled with a laser scanning confocal microscope (LSCM) was used to visualize the effect of temperature on the volume phase transition temperatures of the microgels. In general, increasing the concentration of PEGMA in the PNIPAm-co-Am-co-PEGMA copolymers resulted in a broader and higher lower critical solution temperature (LCST) compared to the PNIPAm microgels. We demonstrated that the PEGMA molecular weight and concentration influenced whether it was incorporated as a grafted copolymer or random copolymer in the PNIPAm microgel. The evidence for this is the shift in the LCST as determined by temperature and differential scanning calorimetry (DSC) measurements. This behavior suggests that incorporation of PEGMA in the copolymer depends on its hydrophilicity or water-solubility which in turn influenced the degree at which the copolymer chains collapsed from a coil-to-globule (volume phase transition) with increasing temperature.

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.

Influence of volume phase transition phenomena on the behavior of hydrogel-based valves

2004 ◽  
Vol 99 (2-3) ◽  
pp. 451-458 ◽  
Author(s):  
Andreas Richter ◽  
Steffen Howitz ◽  
Dirk Kuckling ◽  
Karl-Friedrich Arndt
Keyword(s):  
Phase Transition ◽  
Volume Phase Transition ◽  
Volume Phase
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