Nonturbid Fast Temperature-Responsive Hydrogels with Homogeneous Three-Dimensional Networks by Two Types of Star Polymer Synthesis Methods

2021 ◽  
Author(s):  
DoWoo Kwon ◽  
Yuto Jochi ◽  
Yuumi Okaya ◽  
Takahiro Seki ◽  
Kotaro Satoh ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Polymer Synthesis ◽  
Star Polymer ◽  
Synthesis Methods ◽  
Temperature Responsive ◽  
Responsive Hydrogels

Temperature responsive hydrogels enable transient three-dimensional tumor culturesviarapid cell recovery

2015 ◽  
Vol 104 (1) ◽  
pp. 17-25 ◽  
Author(s):  
John M. Heffernan ◽  
Derek J. Overstreet ◽  
Sanjay Srinivasan ◽  
Long D. Le ◽  
Brent L. Vernon ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Cell Recovery ◽  
Temperature Responsive ◽  
Responsive Hydrogels

Mechanical Properties of Homogeneous Polymer Networks Prepared by Star Polymer Synthesis Methods

2021 ◽  
Author(s):  
Yusuke Baba ◽  
Guohao Gao ◽  
Mitsuo Hara ◽  
Takahiro Seki ◽  
Kotaro Satoh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Networks ◽  
Polymer Synthesis ◽  
Star Polymer ◽  
Synthesis Methods

Dual pH and temperature responsive hydrogels based on β-cyclodextrin derivatives for atorvastatin delivery

2016 ◽  
Vol 136 ◽  
pp. 300-306 ◽  
Author(s):  
Kaiwen Yang ◽  
Sicheng Wan ◽  
Binbin Chen ◽  
Wenxia Gao ◽  
Jiuxi Chen ◽  
...  
Keyword(s):  
Cyclodextrin Derivatives ◽  
Temperature Responsive ◽  
Responsive Hydrogels

Star-polymer synthesis via radical reversible addition-fragmentation chain-transfer polymerization

2001 ◽  
Vol 39 (16) ◽  
pp. 2777-2783 ◽  
Author(s):  
Martina Stenzel-Rosenbaum ◽  
Thomas P. Davis ◽  
Vicki Chen ◽  
Anthony G. Fane
Keyword(s):  
Chain Transfer ◽  
Polymer Synthesis ◽  
Star Polymer ◽  
Reversible Addition ◽  
Chain Transfer Polymerization

Smart Hydrogels for Pharmaceutical Applications

2017 ◽  
pp. 1133-1164
Author(s):  
Snežana S. Ilić-Stojanović ◽  
Ljubiša B. Nikolić ◽  
Vesna D. Nikolić ◽  
Slobodan D. Petrović
Keyword(s):  
Electric Fields ◽  
Polymer Network ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Stimuli Responsive ◽  
Crosslinking Degree ◽  
Color Transparency ◽  
Hydrogel Network ◽  
Physical And Chemical ◽  
Responsive Hydrogels

The latest development in the field of smart hydrogels application as drugs carriers is shown in this chapter. Hydrogels are three-dimensional polymer network consisting of at least one hydrophilic monomer. They are insoluble in water, but in the excess presence of water or physiological fluids, swell to the equilibrium state. The amount of absorbed water depends on the chemical composition and the crosslinking degree of 3D hydrogel network and reaches over 1000% of the xerogel weight. Stimuli-responsive hydrogels exhibit significant change of their properties (swelling, color, transparency, conductivity, shape) due to small changes in the external environment conditions (pH, ionic strength, temperature, light wavelength, magnetic or electric fields, ultrasound, or a combination thereof). This smart hydrogels, with different physical and chemical properties, chemical structure and technology of obtaining, show great potential for application in the pharmaceutical industry. The application of smart hydrogels is very promising and at the beginning of the development and exploitation.

scholarly journals An efficient three-dimensional foil structure model for bump-type gas foil bearings considering friction

Friction ◽  
2020 ◽  
Author(s):  
Yongpeng Gu ◽  
Xudong Lan ◽  
Gexue Ren ◽  
Ming Zhou
Keyword(s):  
Structural Model ◽  
Three Dimensional ◽  
Element Model ◽  
Experimental Results ◽  
Synthesis Methods ◽  
Structure Model ◽  
Foil Bearings ◽  
Static Responses ◽  
Bearing Sleeve ◽  
Shell Finite Element

Abstract This paper presents an efficient three-dimensional (3D) structural model for bump-type gas foil bearings (GFBs) developed by considering friction. The foil structures are modeled with a 3D shell finite element model. Using the bump foil mechanical characteristics, the Guyan reduction and component mode synthesis methods are adopted to improve computational efficiency while guaranteeing accurate static responses. A contact model that includes friction and separation behaviors is presented to model the interactions of the bump foil with the top foil and bearing sleeve. The proposed structural model was validated with published analytical and experimental results. The coupled elastohydrodynamics model of GFBs was established by integration of the proposed structural model with data on hydrodynamic films, and it was validated by comparisons with existing experimental results. The performance of a bearing with an angular misalignment was studied numerically, revealing that the reaction torques of the misaligned bearing predicted by GFB models with 2D and 3D foil structure models are quite different. The 3D foil structure model should be used to study GFB misalignment.

Temperature-responsive hydrogels containing new LCST methacrylate macromonomers

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Anna Korytkowska-Wałach ◽  
Anna Porwoł ◽  
Mirosław Gibas
Keyword(s):  
Phase Transition ◽  
Biomedical Applications ◽  
Tetraethylene Glycol ◽  
Temperature Sensitive ◽  
Hydroxyethyl Methacrylate ◽  
Temperature Responsive ◽  
Michael Type Addition ◽  
Responsive Hydrogels ◽  
Ether Ester ◽  
Gel Transition

AbstractA series of hydrogels were synthesized: homopolymers of new temperature-sensitive methacrylate macromonomers of ether-ester structure, derived from monomethacrylate of tetraethylene glycol via Michael-type addition - oligo(TTEGMMA), and copolymers of oligo(TTEGMMA) with N-isopropylacrylamide (NIPAAm) or 2-hydroxyethyl methacrylate (HEMA). Hydrogels based on oligo(TTEGMMA) demonstrate broad volume phase transition. Combination of oligo(TTEGMMA) with NIPAAm or HEMA yielded hydrogels having narrower phase transition and lower gel transition temperature (LGTT) up to 43 °C at the most, which is in the range of interest for most biomedical applications.

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