Micellization of PS‐PMMA Diblock Copolymers in an Ionic Liquid

Simone, Peter M.; Lodge, Timothy P.

doi:10.1002/macp.200600392

Cited by 56 publications

(74 citation statements)

References 32 publications

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“…Accordingly, the temperature responsiveness was also examined in three different solvent composition regions: the water content (WC) from 0.025 to 0.037 (I), WC from 0.037 to 0.049 (II), and WC above 0.049 (III). Although the micellizaiton behaviors of St/MMA block copolymer have been studied in few systems previously, a block copolymer with similar molecular weight and the same composition was used as control experiments to get more insight into the temperature responsiveness.…”

Section: Resultsmentioning

confidence: 99%

Gradient Structure‐Induced Temperature Responsiveness in Styrene/Methyl Methacrylate Gradient Copolymers Micelles

Zheng

Huang

2013

Macromol. Rapid Commun.

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In this work, micelles are formed by gradient copolymer of styrene and methyl methacrylate in acetone-water mixture and their temperature responsiveness is investigated in a narrow range near room temperature. Three different kinds of structural transitions could be induced by temperature: unimers to micelle transition, shrinkage/stretching of micelles, and morphological transition from spherical micelles to vesicles. In addition, a model analysis on the interface of gradient copolymer micelle is made to better understand these phenomena. It is found that both position and composition of the interface could alter in response to the change in temperature. According to the experiments and model analysis, it is proposed that temperature responsiveness might be an intrinsic and universal property of gradient copolymer micelles, which only originates from the gradient structure.

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Section: Resultsmentioning

confidence: 99%

Gradient Structure‐Induced Temperature Responsiveness in Styrene/Methyl Methacrylate Gradient Copolymers Micelles

Zheng

Huang

2013

Macromol. Rapid Commun.

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“…[43][44][45] More recently, there have been reports on more concentrated systems where it has been demonstrated that blending ILs with BCPs such as PS-b-poly(2-vinyl pyridine), [46][47][48] PS-b-poly (ethylene oxide) 49 [PEO], and PEO-b-poly(propylene oxide)-b-PEO 50 can lead to changes in morphology and d-spacing of the phase-separated domains. In this study, we blend 1-ethyl-3-methylimidazolium …”

Section: Introductionmentioning

confidence: 99%

Can ionic liquid additives be used to extend the scope of poly(styrene)-block-poly(methyl methacrylate) for directed self-assembly?

Bennett

Pei

Cheng

et al. 2014

J. Micro/Nanolith. MEMS MOEMS

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Abstract. Directed self-assembly (DSA) is a promising approach for extending conventional lithographic techniques by being able to print features with critical dimensions under 10 nm. The most widely studied block copolymer system is polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA). This system is well understood in terms of its synthesis, properties, and performance in DSA. However, PS-b-PMMA also has a number of limitations that impact on its performance and hence scope of application. The primary limitation is the low Flory-Huggins polymer-polymer interaction parameter (χ), which limits the size of features that can be printed. Another issue with block copolymers in general is that specific molecular weights need to be synthesized to achieve desired morphologies and feature sizes. Here we explore blending ionic liquid (IL) additives with PS-b-PMMA to increase the χ parameter. ILs have a number of useful properties that include negligible vapor pressure, tunable solvent strength, thermal stability, and chemical stability. The blends of PS-b-PMMA with an IL selective for the PMMA block allowed the resolution of the block copolymer to be improved. Depending on the amount of additive, it is also possible to tune the domain size and the morphology of the systems. These findings may expand the scope of PS-b-PMMA for DSA.

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“…They also found that three polystyrene-block-poly(methyl methacrylate) (PS-PMMA) block copolymers with varying molecular content have been shown to form micelles when dissolved in bmimPF 6 . A morphological transition from spherical to cylindrical micelles was observed upon reduction of the PMMA volume fraction [29]. The transfer of aggregation structure by changing the surfactant molecular parameters or system variable such as concentration and temperature has been realized in traditional solvents [1].…”

Section: Self-assembled Micelles In Ilsmentioning

confidence: 99%