Journal ArticleDOI
Tuning the Thermoresponsive Properties of Weak Polyelectrolytes: Aqueous Solutions of Star-Shaped and Linear Poly(N,N-dimethylaminoethyl Methacrylate)
Felix A. Plamper,Markus Ruppel,Alexander Schmalz,O. V. Borisov,Matthias Ballauff,Axel H. E. Müller +5 more
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In this paper, the authors investigated the thermoresponsive behavior of aqueous solutions of star-shaped and linear poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA).Abstract:
We investigated the thermoresponsive behavior of aqueous solutions of star-shaped and linear poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA). The observed cloud points strongly decrease with increasing pH of the solution. This is explained by a weak charging of the star polymers with decreasing pH. A significant decrease of the cloud points with increasing molecular weight for high pH, i.e., for the almost uncharged state, was found to be virtually independent of the arm number and arm length. These findings are explained by classical Flory−Huggins theory. The increase of cloud points upon charging is captured by introduction of an effective degree of polymerization. Polymers with shorter arms show slightly higher cloud points at low pH than polymers with longer arms. The intramolecular segment density also influences the observed apparent pKb values, leading to higher values for stars with higher arm numbers.read more
Citations
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New directions in thermoresponsive polymers.
TL;DR: By highlighting recent examples of newly developed thermoresponsive polymer systems, it is hoped to promote the development of new generations of smart materials.
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Functional block copolymers: nanostructured materials with emerging applications.
TL;DR: This Review illustrates recent progress in the field of block copolymer materials by highlighting selected emerging applications by highlightingselected emerging applications.
Journal ArticleDOI
Precise hierarchical self-assembly of multicompartment micelles
André H. Gröschel,Felix H. Schacher,Holger Schmalz,O. V. Borisov,O. V. Borisov,Ekaterina B. Zhulina,Andreas Walther,Axel H. E. Müller +7 more
TL;DR: This work demonstrates control over the hierarchical step-growth polymerization of multicompartment micelles into micron-scale segmented supracolloidal polymers as an example of programmable mesoscale colloidal hierarchies via well-defined patchy nanoobjects.
Journal ArticleDOI
Multivalent H-bonds for self-healing hydrogels
Jiaxi Cui,Aránzazu del Campo +1 more
TL;DR: UPy is used as a reversible and dynamic crosslinker to prepare hydrogels that are injectable and undergo rapid self-healing in response to damage.
Journal ArticleDOI
Tuning the Thermoresponsiveness of Weak Polyelectrolytes by pH and Light: Lower and Upper Critical-Solution Temperature of Poly(N,N-dimethylaminoethyl methacrylate)
TL;DR: The presence of multivalent counterions induces an upper critical solutionTemperature (UCST) in addition to the known lower critical solution temperature (LCST) of poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) that can be adjusted by pH of the buffer and by use of hexacyanocobaltate(III) as a trivalent counterion.
References
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Journal ArticleDOI
Synthesis and aqueous solution properties of near-monodisperse tertiary amine methacrylate homopolymers and diblock copolymers
TL;DR: In this paper, a group transfer polymerization of four tertiary amine methacrylates, 2-(dimethylamino)ethyl methacelate (DMA), 2-(diethylamino),ethyl methacricrylate (DEA), DPA, and 2-(N-morpholino) methyl methacylate (MEMA) produced a series of near-monodisperse homopolymers (Mw/Mn<1.15).
Journal ArticleDOI
A statistical theory of weakly charged polyelectrolytes: fluctuations, equation of state, and microphase separation
V. Yu. Borue,I. Ya. Erukhimovich +1 more
TL;DR: In this paper, a theory de solutions de polyelectrolytes avec des polyions de faible densite de charge lineaire is proposed, based on the concept of charge lineaires.
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Tunable pH- and Temperature-Sensitive Copolymer Libraries by Reversible Addition−Fragmentation Chain Transfer Copolymerizations of Methacrylates
TL;DR: In this article reversible addition-fragmentation chain transfer (RAFT) polymerizations have been performed on a Chemspeed Accelerator SLT100 automated synthesizer to polymerize N,N-(dimethylamino)ethyl methacrylate (DMAEMA) and poly(ethylene glycol) methyl ether methacyl (PEGMA) at 70 °C. All polydispersity indices of the obtained copolymers are comprised between 1.11 and 1.30.
Journal ArticleDOI
Synthesis, Characterization and Behavior in Aqueous Solution of Star-Shaped Poly(acrylic acid)
Felix A. Plamper,Harald Becker,Michael G. Lanzendörfer,Mushtaq Patel,Alexander Wittemann,Matthias Ballauff,Axel H. E. Müller +6 more
TL;DR: In this article, a star-shaped poly(acrylic acid) (PAA) with 5, 8, and 21 arms was synthesized by atom transfer radical polymerization of tert-butyl acrylate.