Amphiphilic acrylamide block copolymer: RAFT block copolymerization and monolayer behaviour

Yamamoto, S.; Miyashita, Tokujı; Mitsuishi, Masaya

doi:10.1039/c7ra06788g

Cited by 8 publications

(16 citation statements)

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“…18 Recent studies on pDDAbased nanosheets demonstrate catechol-containing polymer nanosheets for nanoparticle assemblies, 21 silsesquioxane nanosheets, 22 and amphiphilic block copolymer nanosheets. 23,24 Here, we propose a versatile and facile low-dimensional integration approach of π-conjugated units. We designed acrylamide-based polymers with π-conjugated units in side chains to propose a facile and versatile approach to lowdimensional integration: polymer with carbazole units, poly(9ethyl-3-carbazolyl acrylamide) (pCzAA), was the first example of highly stable monolayer formation at the air−water interface.…”

Section: ■ Introductionmentioning

confidence: 99%

High-Density and Monolayer-Level Integration of π-Conjugated Units: Amphiphilic Carbazole Homopolymer Langmuir–Blodgett Films

et al. 2018

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Precise integration of π-conjugated units is a key issue to achieve molecular (nano) electronic devices based on organic semiconductor materials. We specifically examine the Langmuir-Blodgett technique, which allows high-density integration of π-conjugated units. In this study, we designed a carbazole containing acrylamide-based homopolymer [poly(9-ethyl-3-carbazolyl acrylamide) (pCzAA)], in which the π-conjugated unit is connected with a hydrophilic amide unit directly as a side chain. Its Langmuir-Blodgett film formation properties were investigated. The pCzAA polymer took a stable monolayer formation in the presence of a small amount (ca. 10 mol %) of poly( N-dodecylacrylamide) (pDDA). Compared with amphiphilic carbazole-containing copolymers described in earlier reports, the direct connection of π-conjugated units through amide bonding enables the Cz content in monolayers to exceed that of the copolymer monolayers (ca. 30 mol %) dramatically. pCzAA:pDDA takes highly ordered layer structures toward the out-of-plane direction, although no structural order is formed in the in-plane direction. This method is a practical means to develop low-dimensional and high-density integration of π-conjugated units for molecular electronics.

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Section: ■ Introductionmentioning

confidence: 99%

High-Density and Monolayer-Level Integration of π-Conjugated Units: Amphiphilic Carbazole Homopolymer Langmuir–Blodgett Films

et al. 2018

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“…For this study, π* is defined as the highest surface pressure at the corresponding C s –1 peak position, at which monolayers take the most condensed packing state. The C s –1 value of the p(DDA/acac) monolayer is 84.7 mN m –1 , which is almost half of that of the pDDA homopolymer (165 mN m –1 ) . The acac comonomers are hydrophilic and render the monolayer unstable at the air–water interface.…”

Section: Resultsmentioning

confidence: 99%

“…The amphiphilic polymer monolayer behavior was examined using the LB method. ,− Surface pressure (π) – area ( A ) isotherms and monolayer formation were characterized using automatically controlled Langmuir troughs (HBM-AP; Kyowa Interface Science Co. Ltd. and FSD-21; USI Systems Inc.). A chloroform solution of the copolymer at a concentration of ca.…”

Section: Methodsmentioning

confidence: 99%

“…The C s −1 value of the p(DDA/acac) monolayer is 84.7 mN m −1 , which is almost half of that of the pDDA homopolymer (165 mN m −1 ). 29 The acac comonomers are hydrophilic and render the monolayer unstable at the air−water interface. However, the C s −1 values increased to 127 mN m −1 after Ti complex formation with p(DDA/acac), indicating that Ti complex formation enhances the monolayer stability.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Titania Nanofilms from Titanium Complex-Containing Polymer Langmuir–Blodgett Films

et al. 2020

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This paper proposes a method of fabricating low-dimensional TiO2 nanofilms at room temperature under ambient pressure conditions. The titanium-containing polymer complex Ti–p(DDA/acac) was synthesized by reacting an amphiphilic copolymer (p(DDA/acac)) with a titanium complex. Its ultrathin films were prepared using the Langmuir–Blodgett (LB) technique. The monolayer was found to be free from hydrolysis and cross-linking side reactions, even at the air–water interface. The transferred LB films (nanosheets) were oxidized by ultraviolet irradiation at room temperature. The photo-oxidized material has an amorphous and porous structure with subnanometer-scale controllability (0.18 nm per layer). Photocatalytic performance was demonstrated by converting multilayered LB films of Ti–(DDA/acac) and the silicon-containing polymer p(DDA/SQ) into ultrathin hetero-multilayers of TiO2 and SiO2 under UV–O3 treatment. The scalability affords a uniform photopattern formation of photo-oxidized TiO2 films over several hundreds of micrometers.

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“…As mentioned earlier, the method of synthesizing HAPAM polymers significantly influences the hydrophobe distribution on the polymer chain. The chemical synthesis of polyacrylamide is via a free radical polymerization (Giz et al, 2001;Qavi et al 2014;Rintoul, 2017;Yamamoto et al, 2017;Shatat and Niazi, 2018). Notwithstanding, the insoluble nature of the hydrophobic comonomer has led to the chemical modification of the synthesis route for HAPAM polymers (Zhang et al, 2017).…”

Section: Hydrophobically Associating Polymersmentioning

confidence: 99%

Hydrophobically associating polymers for enhanced oil recovery – Part A: A review on the effects of some key reservoir conditions

Afolabi

Oluyemi

Officer

et al. 2019

Journal of Petroleum Science and Engineering

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Research advancement in polymer flooding for Enhanced Oil Recovery (EOR) has been growing over the last decade. This growth can be tied to increased funding towards the development of superior polymers such as hydrophobically associating polymers when oil prices were high and increasing concern that "easy oil" has been exploited with the focus now on "difficult to extract" oil. The use of hydrophobically associating polymers for EOR was discussed along with its limitations. In this context, the improved rheological properties of associating polymers cannot only be linked to the molecular structures arising from different synthesis methods. Equally, external parameters similar to conditions of oil reservoirs affect the rheological properties of these polymers. As such, this review placed critical emphasis on the molecular architecture of the polymer and the synthesis route and this was linked to the observed rheological properties. In addition, the influence of some key oilfield parameters such as temperature, salinity, pH, and reservoir heterogeneity on the rheological behaviour of hydrophobically associating polymers were reviewed. In this respect, the various findings garnered in understanding the correlation between polymer rheological properties and oilfield parameters were critically reviewed. For associating polymers, an understanding of the molecular architecture (and hence the synthesis method) is crucial for its successful design. However, this must be theoretically linked to the preferred EOR application requirements (based on oilfield parameters).

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Amphiphilic acrylamide block copolymer: RAFT block copolymerization and monolayer behaviour

Abstract: Amphiphilic acrylamide block copolymer, synthesized by RAFT polymerization, takes a stable monolayer formation with phase-separated structures at the air–water interface.

Cited by 8 publications

References 40 publications

High-Density and Monolayer-Level Integration of π-Conjugated Units: Amphiphilic Carbazole Homopolymer Langmuir–Blodgett Films

High-Density and Monolayer-Level Integration of π-Conjugated Units: Amphiphilic Carbazole Homopolymer Langmuir–Blodgett Films

Titania Nanofilms from Titanium Complex-Containing Polymer Langmuir–Blodgett Films

Hydrophobically associating polymers for enhanced oil recovery – Part A: A review on the effects of some key reservoir conditions

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