Spherical Particle Formation that Deteriorates Thixotropic Property and its Suppression Strategy for Diamide-Based Additives having Two-Hydrocarbons

Mashiyama, Yuki; Maruyama, Haruka; Satou, Eiichi; Fujimori, Atsuhiro

doi:10.5650/jos.ess21311

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…Large IR band shifts due to hydrogen bonding in this region have recently been widely reported in studies of supramolecular gels with thixotropic additive molecules. [ 41–43 ] Here, also, the bands of OH and NH stretching vibrations shift from around 3700–3200 cm −1 due to hydrogen bond formation.…”

Section: Resultsmentioning

confidence: 88%

Spherulitic Characterization and Hierarchical Structural Evaluation of Azacalixarene‐Polyethylene Glycol Copolymers Containing s‐Triazine Rings

Otsuki,

Terui,

Hoshino

et al. 2023

Macro Chemistry & Physics

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This study investigates the solid‐state structure of a copolymer composed of polyethylene glycol (PEG) and azacalixarene, which has two s‐triazine rings and two phenyl rings alternately crosslinked by amino groups. Azacalixarene derivatives containing a low‐molecular‐weight linker moiety and exhibiting an amorphous structure have been synthesized in previous studies; however, in this study, they are crystallized by the substitution of the linker moiety with PEG. The spherulites formed by the corresponding copolymer possess the ability to form higher‐order structures, growing up to a diameter of 1.7 mm depending on the crystallization conditions. The azacalixarene‐PEG copolymer forms negative spherulites via homogeneous nucleation and exhibits a lamellar period at 13.8 nm. The lamellar crystalline part itself is 5.8 nm in thickness; bulky amorphous regions are also observed in the copolymer structure. Reciprocal lattice analysis results reveal that the crystal parts form a packing structure similar to the crystal lattice of PEG. The promotion of spherulite growth is predicted to reflect the characteristics of the corresponding copolymer, which crystallizes while universally containing many amorphous regions.

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Section: Resultsmentioning

confidence: 88%

Spherulitic Characterization and Hierarchical Structural Evaluation of Azacalixarene‐Polyethylene Glycol Copolymers Containing s‐Triazine Rings

Otsuki,

Terui,

Hoshino

et al. 2023

Macro Chemistry & Physics

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“…Previous studies have elucidated the behavior of achiral thixotropic additive molecules that undergo thermal exposure to become spherical particles and lose their gelling ability [30] . Derivatives with a 12‐hydroxystearyl chain [31] are more efficient thixotropic additives because they have asymmetric carbons and tend to form helical fibers [32] .…”

Section: Introductionmentioning

confidence: 99%

“…[29] Previous studies have elucidated the behavior of achiral thixotropic additive molecules that undergo thermal exposure to become spherical particles and lose their gelling ability. [30]…”

Section: Introductionmentioning

confidence: 99%

Correlation between Chirality and Spherical Particle Formation Related to the Loss of Function of Thixotropic Additive Molecules

2022

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The relationship between chirality and loss of function of thixotropic additive molecules with asymmetric carbon and helical fiber growth under high‐temperature exposure was investigated. Among the thixotropic additive molecules that impart gelation/fluidization ability during pressurization of the solvent, derivatives with high‐performance, helical fiber growth ability became mesoscopic spherical particles upon high‐temperature exposure. Conversely, derivatives that lost their fiber growth ability could not achieve solvent gelation. The growth pattern was such that the helical fibers were transformed into straight fibers. The right‐handed helical signal of the circular dichroism spectrum, which is indicative of chirality by structure formation, was inactivated upon high‐temperature exposure. Therefore, a low‐temperature process or heat treatment in an inert state under a N2 atmosphere is essential for maintaining chirality and helical fibrosis.

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Solvent Selectivity in Helical/Linear Nanofiber-Derived Gelation Imparted by Chiral/Achiral Thixotropic Additive Molecules

Mashiyama

Hasunuma

Fujimori

2023

JFST

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Spherical Particle Formation that Deteriorates Thixotropic Property and its Suppression Strategy for Diamide-Based Additives having Two-Hydrocarbons

Cited by 3 publications

References 38 publications

Spherulitic Characterization and Hierarchical Structural Evaluation of Azacalixarene‐Polyethylene Glycol Copolymers Containing s‐Triazine Rings

Spherulitic Characterization and Hierarchical Structural Evaluation of Azacalixarene‐Polyethylene Glycol Copolymers Containing s‐Triazine Rings

Correlation between Chirality and Spherical Particle Formation Related to the Loss of Function of Thixotropic Additive Molecules

Solvent Selectivity in Helical/Linear Nanofiber-Derived Gelation Imparted by Chiral/Achiral Thixotropic Additive Molecules

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