Water Soluble Responsive Polymer Brushes

Weir, Michael P.; Parnell, Andrew J.

doi:10.3390/polym3042107

Cited by 39 publications

(29 citation statements)

References 83 publications

(66 reference statements)

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“…Such systems are known as polymer brushes and can be prepared with variable grafting density, chain length, chemical composition and geometry. 1,[4][5][6] The important advantages of polymer brushes are the mechanical stability, due to the covalent bonding to the substrate, and the high swelling ratio, which causes a significant thickness change upon switching between swollen and collapsed state in good and bad solvents, respectively. This makes them particularly interesting for controlled release, 7 tunable assembly of coated nanoparticles, 8 responsive nanoactuators 9,10 or for antifouling surfaces.…”

Section: Introductionmentioning

confidence: 99%

Temperature responsive behavior of polymer brush/polyelectrolyte multilayer composites

et al. 2016

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aThe complex interaction of polyelectrolyte multilayers (PEMs) physisorbed onto end-grafted polymer brushes with focus on the temperature-responsive behavior of the system is addressed in this work. The investigated brush/multilayer composite consists of a poly(styrene sulfonate)/poly(diallyldimethylammonium chloride) (PSS/PDADMAC) multilayer deposited onto the poly(N-isopropylacrylamide-bdimethylaminoethyl methacrylate) P(NIPAM-b-DMAEMA) brush. Ellipsometry and neutron reflectometry were used to monitor the brush collapse with the thickness decrease as a function of temperature and the change in the monomer distribution perpendicular to the substrate at temperatures below, across and above the phase transition, respectively. It was found that the adsorption of PEMs onto polymer brushes had a hydrophobization effect on PDMAEMA, inducing the shift of its phase transition to lower temperatures, but without suppressing its temperature-responsiveness. Moreover, the diffusion of the free polyelectrolyte chains inside the charged brush was proved by comparing the neutron scattering length density profile of pure and the corresponding PEM-capped brushes, eased by the enhanced contrast between hydrogenated brushes and deuterated PSS chains. The results presented herein demonstrate the possibility of combining a temperature-responsive brush with polyelectrolyte multilayers without quenching the responsive behavior, even though significant interpolyelectrolyte interactions are present. This is of importance for the design of multicompartment coatings, where the brush can be used as a reservoir for the controlled release of substances and the multilayer on the top as a membrane to control the diffusion in/out by applying different stimuli.

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Section: Introductionmentioning

confidence: 99%

Temperature responsive behavior of polymer brush/polyelectrolyte multilayer composites

et al. 2016

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“…The swelling behaviour of such systems exhibits some notable characteristics depending on the pH of the solvent, concentration and type of ions in the solution, and the grafting density of the brush. In particular, much attention has been paid to weak polyelectrolyte brushes, such as those considered in the present work, because their charge density is not fixed and can be tuned by varying the ionic strength of the surrounding medium [22,23].…”

Section: Introductionmentioning

confidence: 99%

Determination of the molar mass of surface-grafted weak polyelectrolyte brushes using force spectroscopy

Al-Baradi

Tomlinson

Zhang³

et al. 2015

Polymer

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The molar mass and dispersity of a polycation, poly[2-(dimethyl amino)ethyl methacrylate)] (PDMAEMA) grafted from a poly(methyl methacrylate) (PMMA) backbone, was measured by single-molecule force spectroscopy (SMFS) and shown to be consistent with results from gel permeation chromatography for the same comb polymer in aqueous solution. Comparison was then made between the comb polymer and PDMAEMA brushes that were grown from the substrate, as a function of the pH and ionic strength of the surrounding medium, and the limits of reliable characterization of the polymers are determined. A large discrepancy was observed between the responses of the comb and brush layer at low pH when the PDMAEMA molecules are extended from the supporting substrate. Here it is believed that the atomic force microscope (AFM) tip can penetrate the comb layer and selectively desorb side-chains of the comb. In the case of the well solvated PDMAEMA brushes at high pH, the tip preferentially selects larger chains, resulting in an over-estimate of the brush molar mass. The addition of salt also influenced the molar mass obtained by this technique. It is believed that salted brushes did not adhere well to the AFM tip, with subsequent desorption resulting in an underestimate of the molar mass. However, SMFS was shown to be capable of demonstrating the effect of salt on brush conformation, with greater swelling after the addition of a small amount of NaCl, but a significant decrease when 100 mM is added.

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“…Moreover, alumina ceramics have been successfully used as parts of lamps because of their high optical transmittance . Concerning the polymer substrates, grafted‐from polymer brushes have been established as stimuli‐responsive coatings . Their high mechanical stability, by reason of the covalent binding to the substrate, the tunable chain density and molecular weight, make them reasonably suitable to prepare highly adaptable smart coatings to a variety of requirements …”

Section: Figurementioning

confidence: 99%

Transparent Aluminium Oxide Coatings of Polymer Brushes

et al. 2016

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An ovel method for the preparation of transparent Al 2 O 3 coatings of polymers is presented. An environmentalfriendly sol-gel method is employed,w hichi mplies mild conditions and lowcosts.Athermoresponsive brush is chosen as amodel surface.X-rayphotoelectron spectroscopyisused to characterize the samples during the conversion of the precursor Al(OH) 3 into oxide and to prove the mildness of the protocol. The study evidences arelation between lateral homogeneity of alumina and the wettability of the polymer surface by the precursor solution, while morphology and elasticity are dominated by the polymer properties.The study of the swelling behavior of the underneath brush reveals the absence of water uptake,p roving the impermeability of the alumina layer.T he broad chemical and structural variety of polymers,c ombined with the robustness of transparent alumina films,m akes these composites promising as biomedical implants,protective sheets and components for electric and optical devices.

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Water Soluble Responsive Polymer Brushes

Cited by 39 publications

References 83 publications

Temperature responsive behavior of polymer brush/polyelectrolyte multilayer composites

Temperature responsive behavior of polymer brush/polyelectrolyte multilayer composites

Determination of the molar mass of surface-grafted weak polyelectrolyte brushes using force spectroscopy

Transparent Aluminium Oxide Coatings of Polymer Brushes

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