Journal ArticleDOI
Gelation of Triblock Copolymers in Aqueous Solution through CO2‐Triggered Electrostatic Interaction
Bing Yu,Weizheng Fan,Yue Zhao +2 more
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TLDR
In this article, a new and more flexible approach to achieving CO2-induced gelation of polymer aqueous solution at much lower polymer concentrations is described. But this approach requires the use of two water-soluble ABA triblock copolymers that have the same B block but different A blocks, for one polymer, the A blocks are negatively charged polyelectrolyte, and for the other polymer, they can be turned positively charged under CO2 stimulation.Abstract:
Polymer systems displaying CO2-triggered rheology alteration are widely investigated in recent years, which can change from nonviscous liquid to high-viscosity solution or even gel by passing CO2 through. Among those polymer systems, a previous study of the group shows that a rationally designed ABA-type triblock copolymer with a hydrophilic middle block and two CO2-responsive end blocks can undergo either gel–sol or sol–gel transition triggered by CO2 as a result of increase or decrease in lower critical solution temperature of A blocks, respectively. This paper describes a new and more flexible approach to achieving CO2-induced gelation of polymer aqueous solution at much lower polymer concentrations. It consists in mixing two water-soluble ABA triblock copolymers that have the same B block but different A blocks: for one polymer, the A blocks are a negatively charged polyelectrolyte, and for the other polymer, the A blocks can be turned positively charged under CO2 stimulation. In this way, CO2 bubbling through an aqueous solution of the two constituent triblock copolymers can induce complexation of the oppositely charged A blocks and, as a result, gelation of the solution of mixed triblock copolymers.read more
Citations
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Polyelectrolyte-surfactant complexes (PESCs) composed of oppositely charged components
TL;DR: In this article, the authors reviewed the recent developments in the field of oppositely charged polyelectrolyte-surfactant complexes (PESCs) and found that PESCs are typically not static entities but instead highly dynamic systems and recent neutron spin-echo (NSE) measurements indicate that the local dynamics of polyelectron chains is only little affected by the incorporation within such aggregates.
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Bottom-up Engineering of Responsive Hydrogel Materials for Molecular Detection and Biosensing
TL;DR: In this article, molecular sensors respond to target molecules in their surroundings to detect and sometimes even quantify their concentrations Traditionally comprised of small organic molecules or metal complexes, these sensors are used for detecting and quantifying their concentrations.
Journal ArticleDOI
Injectable Hydrogel: Amplifying the pH Sensitivity of a Triblock Copolypeptide by Conjugating the N-Termini via Dynamic Covalent Bonding
Maria-Teodora Popescu,George Liontos,Apostolos Avgeropoulos,Efstathia Voulgari,Konstantinos Avgoustakis,Constantinos Tsitsilianis +5 more
TL;DR: The triblock copolypeptide gelator was investigated as a scaffold for the encapsulation of polymersome nanocarriers, loaded with a hydrophilic model drug, calcein, rendering the system potentially useful for sustained delivery of anticancer drugs locally in the tumor.
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Poly(ethylene glycol)‐interpenetrated genipin‐crosslinked chitosan hydrogels: Structure, pH responsiveness, gelation kinetics, and rheology
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Multicompartment Hydrogels.
TL;DR: In this paper , the latest developments in multicompartment hydrogels are highlighted with a focus on three types of compartments, i.e., micellar/vesicular, droplets or multi-layers including various sub-categories.
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