A Facile Route to Poly(acrylic acid) Brushes Using Atom Transfer Radical Polymerization

Treat, Neil D.; Ayres, Neil; Boyes, Stephen G.; Brittain, William J.

doi:10.1021/ma052001n

Cited by 108 publications

(110 citation statements)

References 42 publications

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“…As indicated by the TGA results shown in Figure 2 a and b, the degree of degradation of HSilica-NH 2 increases by 5.6 % (w/w) at 750 8C compared with the pristine hollow silica spheres. Furthermore, 2-bromoisobutyryl bromide was attached to HSilica-NH 2 could be prepared by ATRP in two ways: One is from ATRP of precursor monomers of PMAA, for example, tertbutyl methacrylate [27][28][29] or p-nitrophenol methacrylate, [30] followed by hydrolysis. The other is by ATRP of sodium methacrylate.…”

Section: Resultsmentioning

confidence: 99%

pH‐Responsive Poly(methacrylic acid)‐Grafted Hollow Silica Vesicles

Lay

Tan

et al. 2011

Chemistry A European J

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Poly(methacrylic acid)-grafted hollow silica vesicles (PMAA-g-hollow silica vesicles) were obtained through a grafting-from approach. PMAA brushes were formed by performing atom-transfer radical polymerisation of sodium methacrylate with an initiator attached to the hollow silica spheres. PMAA-g-hollow silica vesicles were characterised by using TEM, thermogravimetric analysis (TGA) and FTIR spectroscopy. pH-dependent ξ potential and (1)H NMR spectra of PMAA-g-hollow silica vesicles were measured, and the results indicated that MAA brushes in PMAA-g-hollow silica vesicles had a lower ionisation degree and low solubility in acidic aqueous solution, for example, pH 3.4, but a higher ionisation degree and high solubility when the pH was higher than 7. Also it was demonstrated that calcein blue and fluorescein isothiocyanate (FITC) labelled dextran (M(n):10 kDa) could be encapsulated in the interiors of the PMAA-g-hollow silica vesicles with a negligible amount in PMAA brushes at pH 2, and pH-triggered release of calcein blue and FITC-labelled dextran from PMAA-g-hollow silica vesicles was observed at pH 7.4.

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Section: Resultsmentioning

confidence: 99%

pH‐Responsive Poly(methacrylic acid)‐Grafted Hollow Silica Vesicles

Lay

Tan

et al. 2011

Chemistry A European J

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“…At 215 8C, there is a distinct thermal transition, with a heat of fusion (H f ) of 36 J Á g À1 , associated with the thermal conversion of tBA units to AA. [22] These results indicate that the thermal degradation of tBA functionality is complete by approximately 240 8C, which is a key piece of information for the thermolysis reactions described in the subsequent section.…”

Section: Synthesis and Characterization Of Tba Graft Copolymersmentioning

confidence: 69%

Synthesis and Characterization of Semicrystalline Polyethylene‐graft‐Poly(acrylic acid) Copolymers

Schneider

McVerry

Bazan

2011

Macro Chemistry & Physics

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Hydrophilic polyolefin materials were prepared by grafting tBA from PE macroinitiators bearing functionalized norbornene units capable of initiating an ATRP. This method produced semicrystalline graft copolymers (PE‐graft‐PtBA) with narrow molecular weight distributions (1.2–1.4) and tunable tBA content (2–21 mol‐%). Incorporation of tBA resulted in a decrease in crystallinity, but little change in the melting point of the products. Subsequently, the tBA moieties were converted into acrylic acid units through chemical and thermal means to generate PE‐graft‐PAA copolymers. The increased hydrophilicity of the resulting materials was verified by ATR‐IR, solid‐state 13C NMR spectroscopy, contact angle measurements, and TGA.magnified image

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“…[18][19][20] The pyrolysis reaction was very simple since it consisted of heating the polymer brushes at 200 ° C under vacuum for 2 h. As shown in Figure 1 , the conversion of P t BuA into PAA chains clearly occurred at 200 ° C. Figure 2 shows the FTIR-ATR spectra of the P t BuA and PAA brushes before and after the pyrolysis reaction. We have also compared the spectra of the same PAA brush just after pyrolysis, and then after being dried after immersion in aqueous solution at pH = 2 and pH = 9.…”

Section: The Pyrolysis Reaction For the Conversion Into Poly(acrylic mentioning

confidence: 99%

Synthesis and Characterization of Poly(acrylic acid) Brushes: “Grafting‐Onto” Route

Sudre

Siband

Hourdet

et al. 2012

Macro Chemistry & Physics

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A guideline for the synthesis of poly(acrylic acid) brushes on planar silica surfaces by the "grafting-onto" approach is described. It is demonstrated that some thermal precautions must be taken to obtain extended brushes. It is also shown that neutron refl ectivity is well suited for the characterization of each step of the synthesis, while it is (unfortunately) rarely used for that purpose. The steps are the following: fi rst, the substrates are covered with a self-assembled monolayer of epoxy-terminated molecules; then, the poly( tert -butyl acrylate) brushes are built using preformed and end-functionalized chains; fi nally, the deprotection of the ester group is performed using a pyrolysis reaction to convert the poly( tert -butyl acrylate) brushes into poly(acrylic acid) brushes.

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A Facile Route to Poly(acrylic acid) Brushes Using Atom Transfer Radical Polymerization

Cited by 108 publications

References 42 publications

pH‐Responsive Poly(methacrylic acid)‐Grafted Hollow Silica Vesicles

pH‐Responsive Poly(methacrylic acid)‐Grafted Hollow Silica Vesicles

Synthesis and Characterization of Semicrystalline Polyethylene‐graft‐Poly(acrylic acid) Copolymers

Synthesis and Characterization of Poly(acrylic acid) Brushes: “Grafting‐Onto” Route

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