Synthesis and structure of deuterated ultra-low cross-linked poly(N-isopropylacrylamide) microgels

@article{Brugnoni2019SynthesisAS,
  title={Synthesis and structure of deuterated ultra-low cross-linked poly(N-isopropylacrylamide) microgels},
  author={Monia Brugnoni and Anne C. Nickel and Leif C. Kr{\"o}ger and Andrea Scotti and Andrij Pich and Kai Leonhard and Walter Richtering},
  journal={Polymer Chemistry},
  year={2019}
}
Partial deuteration of the N-isopropylacrylamide monomer reveals new insights into the self-cross-linking of polymer chains in ultra-low cross-linked microgels. 
Deswelling of Microgels in Crowded Suspensions Depends on Cross-Link Density and Architecture
Microgels are nanometer-to-micrometer-sized cross-linked polymer networks that swell when dispersed in a good solvent. These soft colloids have emerged as versatile building blocks of smart materia...
Ultralow Crosslinked Microgel Brings Ultrahigh Catalytic Efficiency.
TLDR
A new nanoparticle carrier is synthesized based on the reversible addition-fragmentation chain transfer polymerization method and the self-crosslinking mechanism of PNIPAm, which enables the easy preparation, low cost, long-lasting stability, and high catalytic efficiency of nanoreactors.
In-situ Synthesis and in-operando Swelling/ Deswelling of PolyNIPAM Nanoparticles
and electron beam initiated processes. 2-4 Although the chemistries are well known, there have been no investigation into the mechanistic difference between the chemical and electron beam initiated
Flow properties reveal the particle-to-polymer transition of ultra-low crosslinked microgels.
TLDR
Both the flow curves and the increase of the storage modulus with concentration indicates that ULC microgels can form glass and even reach an apparent jammed state despite their extreme softness.
Thermoresponsive Chitosan-Grafted-Poly(N-vinylcaprolactam) Microgels via Ionotropic Gelation for Oncological Applications
TLDR
This review provides a literature review on the use of dual and multi-responsive chitosan-grafted-poly-(N-vinylcaprolactam) (CP) microgels in drug delivery and oncological applications.
Synthesis and structure of temperature-sensitive nanocapsules
The transport and systematic release of functional agents at specific areas are key challenges in various application fields. These make the development of micro- and nanocapsules, which allow for
In-situ study of the impact of temperature and architecture on the interfacial structure of microgels
The structural characterization of microgels at interfaces is fundamental to understand both their 2D phase behavior and their role as stabilizers that enable emulsions to be broken on demand.
Phase behavior of ultrasoft spheres show stable bcc lattices.
TLDR
The phase behavior of supersoft spheres is explored using solutions of ultralow cross-linked poly(N-isopropylacrylamide)-based microgels as a model system and it is revealed that the stable bcc crystals depend on the interplay between the collapse and the interpenetration of the external shell of the ultralowing cross- linked microgel.
...
...

References

SHOWING 1-10 OF 53 REFERENCES
Cross-Linker-Free N-Isopropylacrylamide Gel Nanospheres
We have found that the free-radical polymerization of N-isopropylacrylamide (NIPAM) in water initiated by potassium persulfate at temperatures well above the phase transition temperature leads to the
Influence of Reaction Conditions on the Synthesis of Self-Cross-Linked N-Isopropylacrylamide Microgels
We report systematic investigations of the reaction conditions necessary for the production of self-cross-linked poly(N-isopropylacrylamide) (PNIPAM) microgel particles. Reaction temperatures (Tsyn)
Effect of cross-link density on the internal structure of poly(N-isopropylacrylamide) microgels
The effect of cross-link density on the structure of Poly-(N-isopropylacrylamide) microgel particles prepared by emulsion polymerization was investigated by static and dynamic light scattering
Persulfate initiated ultra-low cross-linked poly(N-isopropylacrylamide) microgels possess an unusual inverted cross-linking structure.
TLDR
The structure of ultra-low cross-linked microgels is investigated by static light scattering and scanning force microscopy, and it is shown that they have an inverted cross-linking structure with respect to conventionalmicrogels, contrary to what has been assumed previously.
Reversible Inter- and Intra-Microgel Cross-Linking using Disulfides.
Thermoresponsive hydrogel nanoparticles composed of poly(N-isopropylmethacrylamide) (pNIPMAm) and the disulfide-based cross-linker N,N'-bis(acryloyl)cystamine (BAC) have been prepared using a
Free‐Radical Acrylic Polymerization Kinetics at Elevated Temperatures
Free-radical acrylic homo- and copolymerization kinetics are reviewed, focusing on secondary reactions that impact the polymerization rate and polymer molecular weight (MW) under
Colloidal crystals made of poly(N-isopropylacrylamide) microgel particles
Abstract Poly (N-isopropylacrylamide) microgel particles are found to form colloidal crystals similar to those occurring in typical hard-sphere colloids like poly(methylmethacrylate) beads. Samples
Poly(N-isopropylacrylamide) Latices Prepared with Sodium Dodecyl Sulfate
Abstract Stable aqueous colloidal dispersions of cross-linked poly(N-isopropylacrylamide), polyNIPAM, were prepared by aqueous dispersion copolymerization of NIPAM with methylenebisacrylamide, BA, in
Waterborne polymer nanogels non-covalently crosslinked by multiple hydrogen bond arrays
Synthetic colloidal hydrogel particles of sub-micron dimensions, often referred to as microgels and/or nanogels, generally consist of water-soluble polymers held together through chemical
Exploring the colloid-to-polymer transition for ultra-low crosslinked microgels from three to two dimensions
TLDR
The authors show that the properties of a microgel can change from colloidal-like in three dimensions to a flexible polymer under a confined environment.
...
...