Self-assembly of the triblock copolymer 17R4 poly(propylene oxide)14–poly(ethylene oxide)24–poly(propylene oxide)14 in D2O

Kumi, Bryna C.; Hammouda, Boualem; Greer, Sandra C.

doi:10.1016/j.jcis.2014.07.049

Cited by 14 publications

(21 citation statements)

References 35 publications

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“…While Pluronic F108, F87, and L81 are composed of a PEO-PPO-PEO structure, Pluronic 17R4 (MW ¼ 2700 g mol À1 ) has the hydrophobic component on the exterior (PPO-PEO-PPO). 48,49 Unsurprisingly, BNNTs could not be dispersed using Pluronic 17R4. Focusing on the ionic surfactants; anionic surfactant, SDS, has a slightly, though insignicantly, higher mass conversion for BNNTs (3.9%) than for SWCNTs (3.3%).…”

Section: Resultsmentioning

confidence: 99%

Surfactant-assisted individualization and dispersion of boron nitride nanotubes

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Surfactant-assisted individualization and dispersion of boron nitride nanotubes

et al. 2019

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“…The inherent architectural design of the triblock would retain the temperature‐ and shear‐responsive properties demonstrated in our previous work but enable additional freedom to alter the temperature response through the incorporation of comonomers, adjustment of chain length and alteration of polymer concentration. We theorize that these triblock copolymers exist as individually solvated unimers at low temperatures, but form networks of physically crosslinked flower micelles at higher temperatures as the solvent becomes increasingly unfavorable for the poly(alkyl glycidyl ether) ‘A’ blocks . The dynamic nature of the physical crosslinks between micelles enables a reversible response to shear stress, facilitating extrusion of these hydrogels from a syringe (Fig.…”

Section: Introductionmentioning

confidence: 99%

Tunable temperature‐ and shear‐responsive hydrogels based on poly(alkyl glycidyl ether)s

Fellin

Adelmund

Karis

et al. 2018

Polymer International

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We describe the synthesis, characterization and direct-write 3D printing of triblock copolymer hydrogels that have a tunable response to temperature and shear stress. In aqueous solutions, these polymers utilize the temperature-dependent self-association of poly(alkyl glycidyl ether) 'A' blocks and a central poly(ethylene oxide) segment to create a physically crosslinked three-dimensional network. The temperature response of these hydrogels was dependent upon composition, chain length and concentration of the 'A' block in the copolymer. Rheological experiments confirmed the existence of sol-gel transitions and the shear-thinning behavior of the hydrogels. The temperature-and shear-responsive properties enabled direct-write 3D printing of complex objects with high fidelity. Hydrogel cytocompatibility was also confirmed by incorporating HeLa cells into select hydrogels resulting in high viabilities over 24 h. The tunable temperature response and innate shear-thinning properties of these hydrogels, coupled with encouraging cell viability results, present an attractive opportunity for additive manufacturing and tissue engineering applications.

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“…The copolymer structure of 17R4/D 2 O has recently been measured 16 using dynamic light scattering and small-angle neutron scattering in the three regions that roughly correspond to the phase diagram in Fig. 1.…”

Section: Structurementioning

confidence: 99%

“…Two phases coexist in region III: one phase has a high concentration of 17R4 while the other has a much lower concentration 5 with micelles in both phases. 16…”

Section: Structurementioning

confidence: 99%

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Heat capacity anomaly in a self-aggregating system: Triblock copolymer 17R4 in water

Dumancas

Simpson

Jacobs

2015

The Journal of Chemical Physics

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The reverse Pluronic, triblock copolymer 17R4 is formed from poly(propylene oxide) (PPO) and poly(ethylene oxide) (PEO): PPO14 - PEO24 - PPO14, where the number of monomers in each block is denoted by the subscripts. In water, 17R4 has a micellization line marking the transition from a unimer network to self-aggregated spherical micelles which is quite near a cloud point curve above which the system separates into copolymer-rich and copolymer-poor liquid phases. The phase separation has an Ising-like, lower consolute critical point with a well-determined critical temperature and composition. We have measured the heat capacity as a function of temperature using an adiabatic calorimeter for three compositions: (1) the critical composition where the anomaly at the critical point is analyzed, (2) a composition much less than the critical composition with a much smaller spike when the cloud point curve is crossed, and (3) a composition near where the micellization line intersects the cloud point curve that only shows micellization. For the critical composition, the heat capacity anomaly very near the critical point is observed for the first time in a Pluronic/water system and is described well as a second-order phase transition resulting from the copolymer-water interaction. For all compositions, the onset of micellization is clear, but the formation of micelles occurs over a broad range of temperatures and never becomes complete because micelles form differently in each phase above the cloud point curve. The integrated heat capacity gives an enthalpy that is smaller than the standard state enthalpy of micellization given by a van't Hoff plot, a typical result for Pluronic systems.

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Self-assembly of the triblock copolymer 17R4 poly(propylene oxide)14–poly(ethylene oxide)24–poly(propylene oxide)14 in D2O

Cited by 14 publications

References 35 publications

Surfactant-assisted individualization and dispersion of boron nitride nanotubes

Surfactant-assisted individualization and dispersion of boron nitride nanotubes

Tunable temperature‐ and shear‐responsive hydrogels based on poly(alkyl glycidyl ether)s

Heat capacity anomaly in a self-aggregating system: Triblock copolymer 17R4 in water

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