Thermal Rheological Fluid Properties of Particle Dispersion Systems using Side Chain Crystalline Block Copolymer III.

Yao, Shigeru; Sakurai, Makoto; Sekiguchi, Hiroshi; Otsubo, Hiroaki; Uto, Takuya; Yamachika, Yu; Ishino, Wataru; Ichikawa, Satoshi; Tatsumi, Daisuke

doi:10.1678/rheology.41.7

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…In addition, through the use of this supramolecular interaction, the SCCBC can act as a dispersant for a concentrated PE particle dispersion, which then shows unique thermal rheological properties. 1,2,4) 2. Experimental…”

Section: )mentioning

confidence: 99%

Supramolecular Interaction of Side-Chain Crystalline Block Co-Polymer and Its Thermal Rheological Function

et al. 2013

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Recently, we polymerized a block copolymer that was constructed of side-chain crystalline monomer and a solvent-compatible monomer, which we referred to as a side-chain crystalline block copolymer (SCCBC). This SCCBC has a specific melting point. We found that this SCCBC was adsorbed onto polyethylene (PE) crystal by via supramolecular interaction. In addition, through this supramolecular interaction, the SCCBC acts as a dispersant for a concentrated PE particle dispersion, and this dispersion can be considered a Thermal Rheological Fluid.By using this novel supramolecular interaction, we can easily modify the surface properties of high crystalline polymers (PE, polytetrafluoroethylene (PTFE), etc.), which have been thought to be inert. Especially, we can modify the inner surface properties of porous membranes without using physical methods (such as UV irradiation or plasma irradiation). Furthermore, these modified surface properties can revert to those in the non-modified state under changes in temperature. It may possible to develop intelligent materials with use of this supramolecular interaction in the near future.

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confidence: 99%

Supramolecular Interaction of Side-Chain Crystalline Block Co-Polymer and Its Thermal Rheological Function

et al. 2013

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“…The side-chain crystalline block copolymer (SCCBC), a dispersant that reduces the viscosity of a concentrated polyethylene (PE) particle suspension, was developed by Yao et al [1][2][3][4][5][6]. The SCCBC consists of a long alkane sidechain unit that can be adsorbed on the crystalline surface of PE particles via van der Waals forces and a functional unit (FU) with solvent affinity.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, by the action of the SCCBC, a PE particle suspension exists as a low-viscosity fluid; however, as the temperature of the suspension rises above the so-called "transition temperature," the crystalline part of SCCBC melts, van der Waals forces disappear, and the suspension dramatically increases in viscosity and turns into almost solid state [3,6]. This temperature-dependent change in viscosity is reversible [1][2][3]6]. This phenomenon was named thermal rheology (TR); accordingly, the PE particle suspension containing SCCBC is called TR fluid (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon was named thermal rheology (TR); accordingly, the PE particle suspension containing SCCBC is called TR fluid (Fig. 1 ) [ 2 , 6 ]. The transition temperature and the degree of increase in viscosity can be adjusted by changing the type and ratio of TR fluid constituents: the side-chain crystalline unit (SCCU) of SCCBC, the FU of SCCBC, PE particles, and their solvent [ 2 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

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A preliminary animal study of thermal rheology fluid as a new temperature-dependent liquid intravascular embolic material

Imai

Watanabe

Nitta³

et al. 2021

Jpn J Radiol

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Purpose Thermal rheology (TR) fluid, which comprises polyethylene (PE) particles, their dispersant, and solvent, is a material that increases in viscosity to various degrees depending on the type and ratio of these constituents when its temperature rises. The viscosity of type 1 (TRF-1) increases more than that of type 2 (TRF-2) near rabbit body temperature. This preliminary animal study aimed to determine the basic characteristics and embolic effect of TR fluid by comparing TRF-1 and TRF-2. Materials and methods Twenty-four Japanese white rabbits underwent unilateral renal artery embolization using TRF-1 or TRF-2 and follow-up angiography at 7 or 28 days (4 subgroups, n = 6 each). Subsequently, the rabbits were euthanized, and the embolized kidneys were removed for pathological examination. The primary and final embolization rates were defined as the ratio of renal artery area not visible immediately after embolization and follow-up angiography, respectively, to visualized renal artery area before embolization. The final embolization rate and maximum vessel diameter filled with PE particles were compared between materials. Moreover, the embolic effect was determined to be persistent when a two-sided 95% confidence interval (CI) for the difference in means between the embolization rates was < 5%. Results The final embolization rate was significantly higher for the TRF-1 than for the TRF-2 at both 7 (mean 80.7% [SD 18.7] vs. 28.4% [19.9], p = 0.001) and 28 days (94.0% [3.5] vs. 37.8% [15.5], p < 0.001). The maximum occluded vessel diameter was significantly larger for TRF-1 than for TRF-2 (870 µm [417] vs. 270 µm [163], p < 0.001). The embolic effect of TRF-1 was persistent until 28 days (difference between rates − 3.3 [95% CI − 10.0–3.4]). Conclusion The embolic effect of TRF-1 was more persistent than that of TRF-2, and the persistency depended on the type and ratio of TR fluid constituents.

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“…We have also found that this block copolymer interacts with polyethylene (PE) by crystalline supramolecular interaction and that it shows a strong adhesive interaction with PE. This block copolymer, in particular, exerts a very remarkable dispersant effect for a concentrated PE particle dispersion [10][11][12][13][14][15][16][17][18][19][20]. In this study, we have investigated the influence of the addition of this block copolymer on the crystallization of model wax/oil mixtures, and the temperature dependence on its rheological properties.…”

Section: Introductionmentioning

confidence: 99%

Interaction between a Side Chain Crystalline Block Copolymer and Wax

Yao¹

2018

PPEJ

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To solve these issues, the use of various additives has been proposed. In recent years, we have synthesized a block copolymer of acrylate monomers with long alkyl side chain and solvophilic monomers. The SCCBC, in particular, exerts a very remarkable dispersant effect for a concentrated PE particle dispersion. In this study, we have investigated the influence of the addition of the SCCBC on the crystallization of model wax/oil mixtures, and the temperature dependence on its rheological properties. Examination of the temperature dependence of viscosity or viscoelasticity revealed that the addition of SCCBC prevents the wax/oil mixed system from losing fluidity, even at the low temperatures at which wax would normally solidify. The non-solidification and fluidization effects of the model wax/oil mixed system, described herein, will be helpful in reducing blockages in pipelines for crude oil and in reducing the accumulation of sludge at the bottom of oil storage tanks.

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Thermal Rheological Fluid Properties of Particle Dispersion Systems using Side Chain Crystalline Block Copolymer III.

Cited by 9 publications

References 9 publications

Supramolecular Interaction of Side-Chain Crystalline Block Co-Polymer and Its Thermal Rheological Function

Supramolecular Interaction of Side-Chain Crystalline Block Co-Polymer and Its Thermal Rheological Function

A preliminary animal study of thermal rheology fluid as a new temperature-dependent liquid intravascular embolic material

Interaction between a Side Chain Crystalline Block Copolymer and Wax

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