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Keywords = flower necklaces

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12 pages, 1655 KiB  
Article
Characterization of the Micelle Formed by a Hydrophobically Modified Pullulan in Aqueous Solution: Size Exclusion Chromatography
by Jia Yang and Takahiro Sato
Polymers 2021, 13(8), 1237; https://doi.org/10.3390/polym13081237 - 11 Apr 2021
Cited by 4 | Viewed by 2412
Abstract
Size exclusion chromatography equipped with a multi-angle, light-scattering online detector (SEC-MALS) measurements were carried out on a hydrophobically modified pullulan (PUL-OSA) with degrees of substitution (DS) of 0.14, 0.2, and 0.3 in 0.01 M aqueous NaCl to obtain the degree of [...] Read more.
Size exclusion chromatography equipped with a multi-angle, light-scattering online detector (SEC-MALS) measurements were carried out on a hydrophobically modified pullulan (PUL-OSA) with degrees of substitution (DS) of 0.14, 0.2, and 0.3 in 0.01 M aqueous NaCl to obtain the degree of polymerization (N0) dependence of the radius of gyration (⟨S21/2) for PUL-OSA in the aqueous NaCl. The result was consistent with the loose flower necklace model proposed in a previous study, and the increase in the chain size with introducing OSA groups was explained by the backbone stiffness of the loose flower necklace formed by PUL-OSA. For PUL-OSA samples with DS = 0.2 and 0.3, ⟨S21/2 obtained by SEC-MALS in a high N0 region deviated downward from ⟨S21/2 expected by the loose flower necklace model. This deviation came from a tiny amount of the aggregating component of PUL-OSA, taking a branched architecture composed of loose flower necklaces. Although the aggregating component of PUL-OSA was also detected by previous small angle X-ray scattering measurements, its conformation was revealed in this study by SEC-MALS. Full article
(This article belongs to the Special Issue Polymer Micelles II)
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13 pages, 1554 KiB  
Article
Theory of the Flower Micelle Formation of Amphiphilic Random and Periodic Copolymers in Solution
by Takahiro Sato
Polymers 2018, 10(1), 73; https://doi.org/10.3390/polym10010073 - 14 Jan 2018
Cited by 9 | Viewed by 6864
Abstract
The mixing Gibbs energy Δgm for the flower-micelle phase of amphiphilic random and periodic (including alternating) copolymers was formulated on the basis of the lattice model. The formulated Δgm predicts (1) the inverse proportionality of the aggregation number to [...] Read more.
The mixing Gibbs energy Δgm for the flower-micelle phase of amphiphilic random and periodic (including alternating) copolymers was formulated on the basis of the lattice model. The formulated Δgm predicts (1) the inverse proportionality of the aggregation number to the degree of polymerization of the copolymer, (2) the increase of the critical micelle concentration with decreasing the hydrophobe content, and (3) the crossover from the micellization to the liquid–liquid phase separation as the hydrophobe content increases. The transition from the uni-core flower micelle to the multi-core flower necklace as the degree of polymerization increases was also implicitly indicated by the theory. These theoretical results were compared with experimental results for amphiphilic random and alternating copolymers reported so far. Full article
(This article belongs to the Special Issue Polymer Micelles)
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