Solvent-Induced Self-Assembly of Mixed Poly(methyl methacrylate)/Polystyrene Brushes on Planar Silica Substrates:  Molecular Weight Effect

Zhao, Bin; Haasch, Richard T.; MacLaren, Scott

doi:10.1021/ja049570f

Cited by 135 publications

(171 citation statements)

References 66 publications

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“…The use of BCPs in surface chemistry has been further varied by attaching Y-branched initiators and that produce BCP that are pinned at the BCP interface. 57,58 The formation of pinned micelles via Y-branched initiation has been demonstrated by Boyes et al using a combination of ATRP and NMRP synthesis. 54 The grafting of CRP initiators, targeting specific molecular weight, and the minimization of brush PDI are all techniques developed for surface modification that have now been directly applied to grafted BCP nanocomposites.…”

Section: Block Copolymer Nanocompositesmentioning

confidence: 97%

Hierarchically Ordered Montmorillonite Block Copolymer Brushes

2010

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Section: Block Copolymer Nanocompositesmentioning

confidence: 97%

Hierarchically Ordered Montmorillonite Block Copolymer Brushes

2010

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“…The main advantages of these procedures are the homogenous distribution of both incompatible polymer chains over the complete surface, and the suppression of segregation processes. In the few reported approaches these Y-shaped polymer brushes have been obtained by grafting-from [ 34 ] (attachment of a difunctional initiator to the substrate) or grafting-to [ 35 ] (grafting via junction-point functionalized block copolymers). Theoretical studies concerning the variation of morphology depending on the grafting density, molecular weight, and composition were carried out by Zhulina and Balazs.…”

mentioning

confidence: 99%

Stimuli‐Responsive Y‐Shaped Polymer Brushes Based on Junction‐Point‐Reactive Block Copolymers

et al. 2012

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“…It has been predicted theoretically and recently shown experimentally that the different topographies of a certain brush (with given molecular weight, grafting density, and the Flory-Huggins parameter of the polymers) depend on the quality of the solvent that the polymer system is exposed to. [22][23][24][25][26]29,30] It is furthermore possible to switch between two distinct morphologies over many cycles of solvent exchange. This phenomenon is being employed at present to create surfaces of adjustable hydrophobicity.…”

mentioning

confidence: 99%

Dynamically Reconfigurable Polymer Films: Impact on Nanomotion

et al. 2006

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The idea of building motors or engines at nanometer dimensions that eventually could themselves manipulate structures of comparable size has grown along with the major breakthroughs in nanotechnology over the last 20 years. This mainly concerns manipulating nanometer-sized objects such as adsorbed macromolecules or nanometer-sized colloids directly using scanning force microscopy (SFM) techniques that first helped to give a closer look at the nanometer-scale world. Such simple mechanical methods still represent the most fruitful approaches for manipulation on the nanometer scale. [1][2][3][4][5][6][7][8] In a second line of research, attempts are made to construct nanometer-sized motors that are mostly based on natural complexes, mimicking and utilizing the peculiar properties of protein motors. [9][10][11][12][13] Both approaches are already optimized with respect to their specific field of application: for example, in the case of SFM, precise positioning of single colloids, molecules, and even atoms is possible, but manipulating ensembles of particles in parallel is a nearly intractable task. Protein motors such as kinesin microtubuli are highly efficient by their very nature, but only work in aqueous solutions and within a narrow temperature range where they can operate efficiently. Naturally, both approaches cannot cover all conceivable tasks that might emerge with the ongoing development of nanometer-scale science, such as parallel manipulation of nanometer-sized objects over large areas under a broad range of environmental conditions.Polymer systems in their diversity may offer a range of alternatives, especially in the form of suitably designed thin films. Recently, we have proposed to use the unique conformational properties of so-called polymer brushes to move nanometersized objects that are adsorbed on their top.[14] The brushes consist of polymer chains typically several hundreds of nanometers in length, with one end covalently attached to a solid substrate. [15][16][17] The distance between neighboring chains ranges from 0.5 to 5 nm. Such a high grafting density forces the flexible polymer chains to stretch away from the surface. [18,19] Particularly interesting are multicomponent brushes that consist of two or more different polymers, among which phase separation can occur (Fig. 1a). Such systems can be of two different types: i) brushes consisting of diblock or triblock copolymers covalently attached by one block type to a substrate and thus resulting in a variation in the composition along the chains, and ii) brushes made of a mixture of two homopolymers, each of which is attached to the surface, resulting in a lateral variation in composition. [20][21][22][23][24][25][26][27][28] Together with the restriction of the mobility due to grafting, the phase separation results in a topographical nanometer-scale pattern on the brush surface (Fig. 1b). The size, shape, and composition of these patterns depend on many parameters, such as molecular parameters of the attached chains, the surface free energy o...

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Solvent-Induced Self-Assembly of Mixed Poly(methyl methacrylate)/Polystyrene Brushes on Planar Silica Substrates: Molecular Weight Effect

Cited by 135 publications

References 66 publications

Hierarchically Ordered Montmorillonite Block Copolymer Brushes

Hierarchically Ordered Montmorillonite Block Copolymer Brushes

Stimuli‐Responsive Y‐Shaped Polymer Brushes Based on Junction‐Point‐Reactive Block Copolymers

Dynamically Reconfigurable Polymer Films: Impact on Nanomotion

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