Doubly thermo-responsive ABC triblock copolymer nanoparticles prepared through dispersion RAFT polymerization

Li, Quanlong; Gao, Chengqiang; Li, Shentong; Huo, Fei; Zhang, Wangqing

doi:10.1039/c3py01699d

Cited by 79 publications

(82 citation statements)

References 67 publications

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“…This is because the polymer precipitates from the solution when the temperature is raised sequentially which could be further attributed to the hydrophobic interaction among the three blocks above the second LCST. 46 As we can see in Fig. 17(B), the intensity of scattered light, which depends on the concentration of light scatters, starts to decrease gradually at around 35 C due to the hydrophobic block of NIPAM.…”

mentioning

confidence: 84%

Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA₈₂-b-PDMAEMA₁₅₀-b-PNIPAM₆₅) triblock copolymer synthesized by consecutive RAFT polymerization

et al. 2017

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The multi-stimuli-responsive amphiphilic ABC triblock copolymer of poly(methyl methacrylate)-block-poly [N,N-(dimethylamino) ethyl methacrylate]-block-poly(N-isopropylacrylamide) (PMMA-b-PDMAEMA-b-PNIPAM) was synthesized by sequential reversible addition-fragmentation chain transfer (RAFT) polymerizations. Due to the pH-and thermo-responsive blocks of PDMAEMA and thermo-responsive blocks of PNIPAM, the copolymer solution properties can be manipulated by changing the parameters such as temperature and pH, and it formed diverse nanostructures and had gel behavior in different conditions. In detail, when the pH was below 7.3, the pK a of DMAEMA, tertiary amino groups were protonated, the polymer micellar solution like weak gel changed into free-standing gel at around 40 C even at a low concentration of 2 wt%. Further, the gel behavior and morphology of the system were studied by rheology, turbidimetry measurements, transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. When the pH was above the pK a , the triblock copolymer selfassembled into diverse micellar structures including shell-core, corona-shell-core and shell-shell-core nanoparticles as the temperature increased, but no free-standing gelation. The two-step thermoresponsive behavior, corresponding to the different LCSTs of PNIPAM block and DMAEMA block, was evidenced by turbidity analysis. The assembled structures rapidly collapsed due to the enhanced hydrophobic interaction when the temperature further increased. Dynamic light scattering (DLS) was used to confirm the transitions.

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confidence: 84%

Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA₈₂-b-PDMAEMA₁₅₀-b-PNIPAM₆₅) triblock copolymer synthesized by consecutive RAFT polymerization

et al. 2017

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“…There are various studies describing dispersion polymerization syntheses conducted in water/(m)ethanol or water/1,4-dioxane mixtures [42][43][44][45][46][47][48][49][50][51]. However, in this review article we will focus on examples of RAFT dispersion polymerization in the absence of water as a cosolvent.…”

Section: Introductionmentioning

confidence: 99%

Polymerization-induced self-assembly of block copolymer nanoparticles via RAFT non-aqueous dispersion polymerization

Derry

Fielding

Armes

2016

Progress in Polymer Science

542

447

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There is considerable current interest in polymerization-induced self-assembly (PISA) via reversible addition-fragmentation chain transfer (RAFT) polymerization as a versatile and efficient route to various types of block copolymer nano-objects. Many successful PISA syntheses have been conducted in water using either RAFT aqueous dispersion polymerization or RAFT aqueous emulsion polymerization. In contrast, this review article is focused on the growing number of RAFT PISA formulations developed for non-aqueous media. A wide range of monomers have been utilized for both the stabilizer and core-forming blocks to produce diblock copolymer nanoparticles in either polar or non-polar solvents via RAFT dispersion polymerization. Such nanoparticles can exhibit spherical, worm-like or vesicular morphologies, often with controllable size and functionality. Detailed characterization of such sterically-stabilized diblock copolymer dispersions provide important insights into the various morphological transformations that can occur both during the PISA synthesis and also subsequently on exposure to a suitable external stimulus (e.g. temperature).

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“…This membrane consists of a valve structure and a rigid frame; the valve is made of silicone-coated thermoresponsive hydrogels and the frame is made of plastics. [21][22][23][24] The diameter of a sweat gland is about 100 µm, [25] so we also used a similar size for the unit pattern which is arrayed on the membrane. By designing the shape of the valve and the mechanical constraint, we were able to control the area where evaporation occurs depending on temperature.…”

Section: Doi: 101002/adma201905901mentioning

confidence: 99%

Artificial Perspiration Membrane by Programmed Deformation of Thermoresponsive Hydrogels

Kim

et al. 2019

Advanced Materials

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Thermal management is essential for living organisms and electronic devices to survive and maintain their own functions. However, developing flexible cooling devices for flexible electronics or biological systems is challenging because conventional coolers are bulky and require rigid batteries. In nature, skins help to maintain a constant body temperature by dissipating heat through perspiration. Inspired by nature, an artificial perspiration membrane that automatically regulates evaporation depending on temperature using the programmed deformation of thermoresponsive hydrogels is presented. The thermoresponsive hydrogel is patterned into pinwheel shapes and supported by a polymeric rigid frame with stable adhesion using copolymerization. Both shape of the valve and mechanical constraint of the frame allow six times larger evaporation area in the open state compared to the closed state, and the transition occurs at a fast rate (≈1 s). A stretchable membrane is selectively coated to prevent unintended evaporation through the hydrogel while allowing swelling or shrinking of the hydrogel by securing path of water. Consequently, a 30% reduction in evaporation is observed at lower temperature, resulting in regulation of the skin temperature at the thermal model of human skins. This simple, small, and flexible cooler will be useful for maintaining temperature of flexible devices.

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Doubly thermo-responsive ABC triblock copolymer nanoparticles prepared through dispersion RAFT polymerization

Abstract: Doubly thermo-responsive triblock copolymer nanoparticles are prepared by a dispersion RAFT polymerization and the nanoparticles exhibit a two-step phase-transition with increasing temperature.

Cited by 79 publications

References 67 publications

Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA₈₂-b-PDMAEMA₁₅₀-b-PNIPAM₆₅) triblock copolymer synthesized by consecutive RAFT polymerization

Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA₈₂-b-PDMAEMA₁₅₀-b-PNIPAM₆₅) triblock copolymer synthesized by consecutive RAFT polymerization

Polymerization-induced self-assembly of block copolymer nanoparticles via RAFT non-aqueous dispersion polymerization

Artificial Perspiration Membrane by Programmed Deformation of Thermoresponsive Hydrogels

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Doubly thermo-responsive ABC triblock copolymer nanoparticles prepared through dispersion RAFT polymerization

Abstract: Doubly thermo-responsive triblock copolymer nanoparticles are prepared by a dispersion RAFT polymerization and the nanoparticles exhibit a two-step phase-transition with increasing temperature.

Cited by 79 publications

References 67 publications

Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA82-b-PDMAEMA150-b-PNIPAM65) triblock copolymer synthesized by consecutive RAFT polymerization

Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA82-b-PDMAEMA150-b-PNIPAM65) triblock copolymer synthesized by consecutive RAFT polymerization

Polymerization-induced self-assembly of block copolymer nanoparticles via RAFT non-aqueous dispersion polymerization

Artificial Perspiration Membrane by Programmed Deformation of Thermoresponsive Hydrogels

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Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA₈₂-b-PDMAEMA₁₅₀-b-PNIPAM₆₅) triblock copolymer synthesized by consecutive RAFT polymerization

Micellization and gelatinization in aqueous media of pH- and thermo-responsive amphiphilic ABC (PMMA₈₂-b-PDMAEMA₁₅₀-b-PNIPAM₆₅) triblock copolymer synthesized by consecutive RAFT polymerization