Dual CO2/temperature-responsive diblock copolymers confer controlled reversible emulsion behavior

2019 ◽  
Vol 10 (21) ◽  
pp. 2641-2646 ◽  
Author(s):  
Yeong-Tarng Shieh ◽  
Pei-Yu Tai ◽  
Chih-Chia Cheng
Keyword(s):  
Diblock Copolymers ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Temperature Responsive

Dual-stimuli responsive diblock copolymers possessing unique temperature-sensitive and CO2/N2-switching ability were successfully developed to promote efficient manipulation of reversible emulsification processes.

scholarly journals Quantifying the bending of bilayer temperature-sensitive hydrogels

2017 ◽  
Vol 473 (2200) ◽  
pp. 20170092 ◽  
Author(s):  
Chenling Dong ◽  
Bin Chen
Keyword(s):  
Finite Deformation ◽  
Deformation Theory ◽  
Mechanical Performance ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Optimal Thickness ◽  
Change Analysis ◽  
Temperature Responsive ◽  
Finite Deformation Theory ◽  
Responsive Hydrogels

Stimuli-responsive hydrogels can serve as manipulators, including grippers, sensors, etc., where structures can undergo significant bending. Here, a finite-deformation theory is developed to quantify the evolution of the curvature of bilayer temperature-sensitive hydrogels when subjected to a temperature change. Analysis of the theory indicates that there is an optimal thickness ratio to acquire the largest curvature in the bilayer and also suggests that the sign or the magnitude of the curvature can be significantly affected by pre-stretches or small pores in the bilayer. This study may provide important guidelines in fabricating temperature-responsive bilayers with desirable mechanical performance.

Multi-Stimuli-Responsive Mesoporous Membranes and Effect of Molecular Architecture on Thermo- and pH-Responsive Behavior of the grafted Block Copolymer brushes

2019 ◽  
Author(s):  
Yanchun Tang ◽  
Kohzo Ito ◽  
Hideaki Yokoyama
Keyword(s):  
Polymer Brushes ◽  
Diblock Copolymers ◽  
Neutron Reflectivity ◽  
Molecular Architecture ◽  
Stimuli Responsive ◽  
Responsive Polymer ◽  
The Matrix ◽  
Stable Part ◽  
Copolymer Brushes ◽  
Mesoporous Membranes

In this study, we prepared ultrafiltration membranes with a decoupled responses of filtration property to temperature and pH. The membrane preparation method was developed based on our previous work. We utilized methanol-supercritical carbon dioxide (methanol-scCO<sub>2</sub>) selective swelling method to introduce nanopores to block copolymers containing poly(diethylene glycol) methyl ether methacrylate (PMEO<sub>2</sub>MA), poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) and polystyrene (PS) blocks. Formation of the mesoporous barrier layer with PS being the mechanically stable part of the matrix was driven by selective swelling of the PMEO<sub>2</sub>MA-b-PDMAEMA domains. Due to the selective swelling of PMEO<sub>2</sub>MA or PDMAEMA domains to introduce pores, the interior of the pores are covered with PMEO<sub>2</sub>MA or PDMAEMA blocks after pore formation. The PMEO<sub>2</sub>MA-b-PDMAEMA polymer brushes are naturally attached on the pore walls and worked as functional gates. PMEO<sub>2</sub>MA is a non-toxic, neutral thermo-responsive polymer with LCST at 26 ᴼC. PDMAEMA is a typical weak polyelectrolyte with pK<sub>a</sub> value at 7.0-7.5 and also a thermo-responsive polymer revealed a LCST of 20-80 °C in aqueous solution. Therefore, these membranes were expected to have multi dimensions as function of the combination of temperature and pH. Moreover, to understand the detail of the temperature and pH depended conformation transitions of PMEO<sub>2</sub>MA-b-PDMAEMA brushes, those diblock copolymers were end-tethered on flat substrates and analyzed via neutron reflectivity (NR).

The light-controlling of temperature-responsivity in stimuli-responsive polymers

2019 ◽  
Vol 10 (42) ◽  
pp. 5686-5720 ◽  
Author(s):  
Amin Abdollahi ◽  
Hossein Roghani-Mamaqani ◽  
Bahareh Razavi ◽  
Mehdi Salami-Kalajahi
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Temperature Responsive ◽  
The Media ◽  
Physical And Chemical ◽  
And Chemical Properties

Light-controlling of phase separation in temperature-responsive polymer solutions by using light-responsive materials for reversible controlling physical and chemical properties of the media with an out-of-system stimulus with tunable intensity.

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.

From multi-responsive tri- and diblock copolymers to diblock-copolymer-decorated gold nanoparticles: the effect of architecture on micellization behaviors in aqueous solutions

Soft Matter ◽  
2015 ◽  
Vol 11 (24) ◽  
pp. 4830-4839 ◽  
Author(s):  
Lichun Song ◽  
Hui Sun ◽  
Xiaolu Chen ◽  
Xia Han ◽  
Honglai Liu
Keyword(s):  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Diblock Copolymer ◽  
Triblock Copolymer ◽  
Diblock Copolymers ◽  
Stimuli Responsive ◽  
Aba Triblock Copolymer

This work reports on the aqueous stimuli-responsive behaviors of an ABA triblock copolymer, a BAB triblock copolymer, an AB diblock copolymer and citrate-based gold nanoparticles decorated with AB diblock copolymers.

Stimuli-Responsive Materials Applied as Carriers of Immobilized Enzymes

2009 ◽  
Vol 610-613 ◽  
pp. 1198-1202 ◽  
Author(s):  
Yu Zhang ◽  
Jing Liang Xu ◽  
Zhen Hong Yuan
Keyword(s):  
Steric Hindrance ◽  
Enzymatic Reaction ◽  
Immobilized Enzymes ◽  
Stimuli Responsive ◽  
Ph Responsive ◽  
Responsive Materials ◽  
Temperature Responsive ◽  
Activity Loss ◽  
Better Than

Enzymes, immobilized on pH/temperature/ion-responsive carriers, relieve poor contact and could be conveniently recycled as well. Enzymes were immobilized on pH-responsive carriers often by covalent method, which was better than non-covalent method (adsorption). The immobilized enzymes showed slight steric hindrance for enzymatic reaction, but always lose much activity during recycle process. The Km values were often increased significantly via immobilization on temperature/ion responsive carriers, while the immobilized enzymes expressed superior reusability. Both covalent and non-covalent methods were fit for enzymes to be immobilized on temperature-responsive carriers. Non-covalent method (entrapment) was preferential choose for enzymes to be immobilized on ion-responsive carriers. Many drawbacks, such as large activity loss and slow respondence during stimulus occurrence, seriously restrained the effect of the immobilized enzymes. It was supposed to open up special stimuli-responsive materials for enzymes immobilization, and choose proper immobilization methods, correspondingly.

scholarly journals Combination of Three Functionalized Temperature-Sensitive Chromatographic Materials for Serum Protein Analysis

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2626
Author(s):  
Weiwei Sun ◽  
Rongji Dai ◽  
Bo Li ◽  
Guoxin Dai ◽  
Di Wang ◽  
...  
Keyword(s):  
Stationary Phase ◽  
Stationary Phases ◽  
Mouse Serum ◽  
Temperature Sensitive ◽  
Temperature Responsive ◽  
Reversible Addition ◽  
Acidic Proteins ◽  
Chain Transfer Polymerization ◽  
Protein Bovine Serum Albumin ◽  
Alkaline Protein

We have developed a methodology to capture acidic proteins, alkaline proteins, and glycoproteins separately in mouse serum using a combination of three functionalized temperature-responsive chromatographic stationary phases. The temperature-responsive polymer poly(N-isopropylacrylamide) was attached to the stationary phase, silica. The three temperature-responsive chromatographic stationary phase materials were prepared by reversible addition–fragmentation chain transfer polymerization. Alkaline, acidic, and boric acid functional groups were introduced to capture acidic proteins, alkaline proteins, and glycoproteins, respectively. The protein enrichment and release properties of the materials were examined using the acidic protein, bovine serum albumin; the alkaline protein, protamine; and the glycoprotein, horseradish peroxidase. Finally, the three materials were used to analyze mouse serum. Without switching the mobile phase, the capture and separation of mouse serum was achieved by the combination of three temperature-responsive chromatographic stationary phase materials. On the whole, 313 proteins were identified successfully. The number of different proteins identified using the new method was 1.46 times greater than the number of proteins that has been identified without applying this method. To our knowledge, this method is the first combinatorial use of three functionalized temperature-responsive chromatographic stationary phase silica materials to separate proteins in mouse serum.

Nanostructure controlled sustained delivery of human growth hormone using injectable, biodegradable, pH/temperature responsive nanobiohybrid hydrogel

Nanoscale ◽  
2015 ◽  
Vol 7 (7) ◽  
pp. 3043-3054 ◽  
Author(s):  
Narendra K. Singh ◽  
Quang Vinh Nguyen ◽  
Bong Sup Kim ◽  
Doo Sung Lee
Keyword(s):  
Growth Hormone ◽  
Layered Double Hydroxide ◽  
Human Growth Hormone ◽  
Human Growth ◽  
Temperature Sensitive ◽  
Sustained Delivery ◽  
Temperature Responsive ◽  
Hydrogel Matrix ◽  
Temperature Sensitive Hydrogel ◽  
Double Hydroxide

The combination of layered double hydroxide nanoclay particles and pH/temperature-sensitive hydrogel matrix effectively controlled the delivery of human growth hormone.

scholarly journals Stimuli-Responsive Shape Switching of Polymer Colloids by Temperature-Sensitive Absorption of Solvent

2016 ◽  
Vol 128 (34) ◽  
pp. 10106-10109 ◽  
Author(s):  
Huaguang Wang ◽  
Binghui Li ◽  
Arjun G. Yodh ◽  
Zexin Zhang
Keyword(s):  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Polymer Colloids
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