CO 2 ‐responsive polymer surfactant formed by noncovalent binding between dimethyl‐dodecylamine and alginate

2018 ◽  
Vol 68 (4) ◽  
pp. 661-666
Author(s):  
Jisheng Yang ◽  
Jinfeng Li ◽  
Hongbiao Dong
Keyword(s):  
Responsive Polymer ◽  
Polymer Surfactant ◽  
Noncovalent Binding

Environmentally Friendly Preparation of Magnetic Composites Featuring Proteolytic Properties

INEOS OPEN ◽  
2020 ◽  
Author(s):  
N. A. Samoilova ◽  
Keyword(s):  
Enzyme Immobilization ◽  
Maleic Acid ◽  
Environmentally Friendly ◽  
Synthetic Polymer ◽  
Magnetic Composites ◽  
Interpolyelectrolyte Complex ◽  
Hydrolysis Rates ◽  
Poly Ethylene ◽  
Noncovalent Binding

The enzyme-containing magnetic composites are presented. The magnetic matrix for enzyme immobilization is obtained by sequential application of an amine-containing polysaccharide—chitosan and a synthetic polymer—poly(ethylene-alt-maleic acid) to the magnetite microparticles to form the interpolyelectrolyte complex shell. Then, the enzyme (trypsin) is immobilized by covalent or noncovalent binding. Thus, the suggested composites can be readily obtained in the environmentally friendly manner. The enzyme capacity of the resulting composites reaches 28.0–32.6 mg/g. The maximum hydrolysis rates of the H-Val-Leu-Lys-pNA substrate provided by these composites range within 0.60·10–7–0.77·10–7 M/min.

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).

scholarly journals Thermo-responsive polymer encapsulated gold nanorods for single continuous wave laser-induced photodynamic/photothermal tumour therapy

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Beilei Gong ◽  
Yuanbing Shen ◽  
Huiyan Li ◽  
Xiaojun Li ◽  
Xia Huan ◽  
...  
Keyword(s):  
Gold Nanorods ◽  
Biomedical Applications ◽  
Continuous Wave ◽  
Continuous Wave Laser ◽  
Tumour Site ◽  
Polymer Shell ◽  
Potential System ◽  
Responsive Polymer ◽  
Good Biocompatibility ◽  
Spr Effect

AbstractOwing to strong and tunable surface plasmon resonance (SPR) effect and good biocompatibility, gold nanoparticles have been suggested to be a versatile platform for a broad range of biomedical applications. In this study, a new nanoplatform of thermo-responsive polymer encapsulated gold nanorods incorporating indocyanine green (ICG) was designed to couple the photothermal properties of gold nanorods (AuNRs) and the photodynamic properties of ICG to enhance the photodynamic/photothermal combination therapy (PDT/PTT). In addition to the significantly increased payload and enhancing photostability of ICG, the polymer shell in the nanoplatform also has thermo-responsive characteristics that can control the release of drugs at tumour sites upon the laser irradiation. On the basis of these improvements, the nanoplatform strongly increased drug aggregation at the tumour site and improved the photothermal/photodynamic therapeutic efficacy. These results suggest that this nanoplatform would be a great potential system for tumour imaging and antitumour therapy.

The Role of Hydrophobicity in Supramolecular Polymer/Surfactant Catalysts: An Understandable Model for Enzymatic Catalysis

2020 ◽  
Author(s):  
Paulo F.A. Costa ◽  
Rafael de Abreu ◽  
Andressa B. Fontana ◽  
Haidi D. Fiedler ◽  
Anthony J. Kirby ◽  
...  
Keyword(s):  
Enzymatic Catalysis ◽  
Supramolecular Polymer ◽  
Polymer Surfactant

Polymer-surfactant-controlled 3D confined assembly of block copolymers for nanostructured colloidal particles

Polymer ◽  
2021 ◽  
Vol 213 ◽  
pp. 123326
Author(s):  
Tingting Cui ◽  
Xiang Li ◽  
Zizhun Wang ◽  
Lixin Wu ◽  
Haolong Li
Keyword(s):  
Block Copolymers ◽  
Colloidal Particles ◽  
Polymer Surfactant

scholarly journals Grafting of a Stimuli Responsive Polymer on Nanolayered Coextruded PS/PCL Films by Surface Initiated Polymerization

2016 ◽  
Vol 301 (7) ◽  
pp. 870-875 ◽  
Author(s):  
Katrina D. Pangilinan ◽  
Al Christopher C. de Leon ◽  
Joey Dacula Mangadlao ◽  
Eric Baer ◽  
Rigoberto C. Advincula
Keyword(s):  
Stimuli Responsive ◽  
Surface Initiated Polymerization ◽  
Responsive Polymer ◽  
Stimuli Responsive Polymer
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