Facile fabrication of poly(acrylic acid) hollow nanogels via in situ Pickering miniemulsion polymerization

2015 ◽  
Vol 6 (34) ◽  
pp. 6125-6128 ◽  
Author(s):  
Jianan Zhang ◽  
Zhengquan Lu ◽  
Mingyuan Wu ◽  
Qingyun Wu ◽  
Jianjun Yang
Keyword(s):  
Acrylic Acid ◽  
Liquid Core ◽  
Miniemulsion Polymerization ◽  
Facile Fabrication ◽  
Polymerization Method ◽  
Hydrophobic Solvent ◽  
Poly Acrylic Acid

We report herein a facile and large fabrication of PAA hollow nanogels via an in situ Pickering miniemulsion polymerization method by using a hydrophobic solvent as the liquid core.

scholarly journals The Anomalous Influence of Polyelectrolyte Concentration on the Deposition and Nanostructure of Poly(ethyleneimine)/Poly(acrylic acid) Multilayers

Molecules ◽  
2019 ◽  
Vol 24 (11) ◽  
pp. 2141 ◽  
Author(s):  
Martin Müller
Keyword(s):  
Acrylic Acid ◽  
Attenuated Total Reflection ◽  
Silicon Substrates ◽  
Acid Base ◽  
Exponential Relationship ◽  
Individual Adsorption ◽  
The Individual ◽  
Poly Acrylic Acid

The deposition and nanostructure of polyelectrolyte (PEL) multilayers (PEMs) of branched poly(ethyleneimine)/poly(acrylic acid) (PEI/PAA) onto silicon substrates was studied in terms of the dependence of pH and the PEL concentration (cPEL) in the individual adsorption steps z. Both a commercial automatic dipping device and a homebuilt automatic stream coating device (flow cell) were used. Gravimetry, SFM, transmission (TRANS) and in situ attenuated total reflection (ATR) FTIR spectroscopy were used for the quantitative determination of the adsorbed amount, thickness, chemical composition and morphology of deposited PEMs, respectively. Firstly, the combination of pH = 10 for PEI and pH = 4 for PAA, where both PEL were predominantly in the neutral state, resulted in an extraordinarily high PEM deposition, while pH combinations, where one PEL component was charged, resulted in a significantly lower PEM deposition. This was attributed to both PEL conformation effects and acid/base interactions between basic PEI and acidic PAA. Secondly, for that pH combination an exponential relationship between PEM thickness and adsorption step z was found. Thirdly, based on the results of three independent methods, the course of the deposited amount of a PEM-10 (z = 10) versus cPEL in the range 0.001 to 0.015 M at pH = 10/4 was non-monotonous showing a pronounced maximum at cPEL = 0.005 M. Analogously, for cPEL = 0.005 M a maximum of roughness and structure size was found. Fourthly, related to that finding, in situ ATR-FTIR measurements gave evidence for the release of outermost located PEI upon PAA immersion (even step) and of outermost PAA upon PEI immersion (odd step) under formation of PEL complexes in solution. These studies help us to prepare PEL-based films with a defined thickness and morphology for interaction with biofluids in the biomedical and food fields.

scholarly journals Ceria/polymer nanocontainers for high-performance encapsulation of fluorophores

2019 ◽  
Vol 10 ◽  
pp. 522-530 ◽  
Author(s):  
Kartheek Katta ◽  
Dmitry Busko ◽  
Yuri Avlasevich ◽  
Katharina Landfester ◽  
Stanislav Baluschev ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
High Performance ◽  
Liquid Core ◽  
Miniemulsion Polymerization ◽  
Oxygen Scavenger ◽  
Nanoparticle Layer ◽  
Electronically Excited ◽  
Organic Fluorophore ◽  
Fluorescent Molecules

We report the synthesis of high-performance organic–inorganic hybrid fluorescent nanocapsules comprising a polymer shell armored with an inorganic layer and a liquid core containing a fluorophore. The polymeric capsules are synthesized by free radical miniemulsion polymerization and contain covalently bound carboxylate surface functionalities that allow for the binding of metal ions through electrostatic interaction. A cerium(IV) oxide nanoparticle layer, formed in situ at the surface of the hybrid nanocapsules, acts as oxygen scavenger and keeps external reactive molecular oxygen from entering into the capsules, eventually resulting in a reduction of the photooxidation of encapsulated fluorescent molecules. This approach shows an increase in the fluorescence of the model organic fluorophore terrylene diimide by avoiding the ground-state molecular oxygen to react with electronically excited states of the fluorescent hydrocarbon molecule.

Facile fabrication of Janus magnetic microcapsules via double in situ miniemulsion polymerization

2013 ◽  
Vol 4 (5) ◽  
pp. 1459-1466 ◽  
Author(s):  
Jianan Zhang ◽  
Shuilai Qiu ◽  
Yulu Zhu ◽  
Zhengqi Huang ◽  
Beibei Yang ◽  
...  
Keyword(s):  
Miniemulsion Polymerization ◽  
Facile Fabrication

In situ polymerization induced supramolecular hydrogels of chitosan and poly(acrylic acid-acrylamide) with high toughness

2017 ◽  
Vol 1 (2) ◽  
pp. 310-318 ◽  
Author(s):  
Jin Li ◽  
Zhilong Su ◽  
Xiaodong Ma ◽  
Hongjie Xu ◽  
Zixing Shi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Electrostatic Interaction ◽  
In Situ Polymerization ◽  
Supramolecular Hydrogel ◽  
High Toughness ◽  
Poly Acrylic Acid

A novel type of supramolecular hydrogel was developed byin situpolymerization of acrylic acid (AA) and acrylamide (AM) monomers in the aqueous solution of chitosan (CS) based on the dynamic electrostatic interaction of ions.

scholarly journals In Situ Nitroxide-Mediated Polymerized Poly(acrylic acid) as a Stabilizer/Compatibilizer Carbon Nanotube/Polymer Composites

2007 ◽  
Vol 2007 ◽  
pp. 1-12 ◽  
Author(s):  
Vitaliy Datsyuk ◽  
Laurent Billon ◽  
Christelle Guerret-Piécourt ◽  
Sylvie Dagréou ◽  
Nicolas Passade-Boupatt ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Acrylic Acid ◽  
Polymer Composites ◽  
Diblock Copolymers ◽  
Polymer Network ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Wide Range ◽  
Poly Acrylic Acid

Carbon nanotube (CNT) polymer composites were synthesized via in situ nitroxide-mediated diblock copolymerization. Poly(acrylic acid) (PAA) was chosen as a first block to obtain a precomposite CNT-PAA which is readily dispersible in various solvents including water. The immobilization of the stable poly(acrylic acid) alkoxyamine functionality on the nanotube surface occurs during the synthesis of the first block without CNT prior treatment. The living character of this block is established by spectroscopic methods and the nature of the CNT/PAA interaction is discussed. This living first block offers the opportunity to reinitiate the polymerization of a second block that can be chosen among a wide range of monomers. This versatility is illustrated with a second block containing methyl acrylate (MA) or styrene (S). Scanning and transmission electron microscopies confirm good CNT dispersion in the polymer network, while transmission electron microscopy also spots the anchorage locations of PAA on the CNT surface. Such nanotubes wrapped by diblock copolymers can be dispersed in various polymer matrices to create CNT—polymer composites. Conductivity measurements show that these composites obey a percolation-like power law with a low percolation threshold (less than 0.5 vol%) and a high maximum conductivity (up to 1.5 S/cm at room temperature).

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