Cyclic and Multicyclic Topological Polymers

Yamamoto, Takuya; Tezuka, Yasuyuki

doi:10.1002/9780470825150.ch1

Cited by 4 publications

(3 citation statements)

References 56 publications

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“…Significant functionalities arise from the unique shape4567, namely topology effects89, especially in relation to their stability. We designed cyclic amphiphilic block copolymers (Fig.…”

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confidence: 99%

Tuneable enhancement of the salt and thermal stability of polymeric micelles by cyclized amphiphiles

2013

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Cyclic molecules provide better stability for their aggregates. Typically in nature, the unique cyclic cell membrane lipids allow thermophilic archaea to inhabit extreme conditions. By mimicking the biological design, the robustness of self-assembled synthetic nanostructures is expected to be improved. Here we report topology effects by cyclized polymeric amphiphiles against their linear counterparts, demonstrating a drastic enhancement in the thermal, as well as salt stability of self-assembled micelles. Furthermore, through coassembly of the linear and cyclic amphiphiles, the stability was successfully tuned for a wide range of temperatures and salt concentrations. The enhanced thermal/salt stability was exploited in a halogen exchange reaction to stimulate the catalytic activity. The mechanism for the enhancement was also investigated. These topology effects by the cyclic amphiphiles offer unprecedented opportunities in polymer materials design unattainable by traditional means.

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“…Significant functionalities arise from the unique shape4567, namely topology effects89, especially in relation to their stability. We designed cyclic amphiphilic block copolymers (Fig.…”

mentioning

confidence: 99%

Tuneable enhancement of the salt and thermal stability of polymeric micelles by cyclized amphiphiles

2013

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“…1 As a concept originally conceived from mathematics, topology has been extensively studied in rather broad fields, like physics, biology and chemistry, and retained its most essential meaning to deal with spatial relationships of interested subunits. Distinctive from small molecules with a defined composition and discrete topology, macromolecules could exist with a completely diverse topology, like linear or cyclic, 2 hyperbranched 3 or dendritic, 4 and even more complicated forms. 5 The much more complex topology of polymers could vary from an irregular one as in hyperbranched polymers 3 b to a highly periodic network as in crystalline covalent organic frameworks 6 and hydrogen-bonded organic frameworks.…”

Section: Introductionmentioning

confidence: 99%

From luminescent π-conjugated macrocycles to bridged multi-cyclic π-conjugated polymers: cyclic topology, aggregation-induced emission, and explosive sensing

et al. 2023

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“…Linear polylactides (PLAs) have high biodegradability and biocompatibility, with their potential applications in the medical, pharmaceutical and materials fields having drawn a significant amount of attention [1,2,3]. Cyclic polylactide ( c PLA), which is a structural isomer of PLA with an unique topology, also displays favorable properties [4,5,6,7,8]. For example, a study on the effect of c PLAs on tumor cells and tumor-bearing mice demonstrated that c PLAs effectively inhibit tumor cell growth [9].…”

Section: Introductionmentioning

confidence: 99%

Organocatalytic Stereoselective Cyclic Polylactide Synthesis in Supercritical Carbon Dioxide under Plasticizing Conditions

et al. 2018

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Cyclic polylactide ( c PLA) is a structural isomer of linear polylactide (PLA) although it possesses unique functionalities in comparison to its linear counterpart. Hitherto, the control of stereochemical purity in conventional c PLA synthesis has not been achieved. In this study, highly stereochemically pure c PLA was synthesized in the absence of a metal catalyst and organic solvent, which required high consumption of the residual monomer. The synthesis was conducted in supercritical carbon dioxide under CO 2 plasticizing polymerization conditions in the presence of an organocatalyst and thiourea additives. In comparison with the stereocomplexes synthesized through conventional methods, c PLA from l -lactide ( c PLLA) and c PLA from d -lactide ( c PDLA) were synthesized with higher stereochemical purity and improved thermal stability. Moreover, the method presented herein is environmentally friendly and thus, applicable on an industrial level.

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Cyclic and Multicyclic Topological Polymers

Cited by 4 publications

References 56 publications

Tuneable enhancement of the salt and thermal stability of polymeric micelles by cyclized amphiphiles

Tuneable enhancement of the salt and thermal stability of polymeric micelles by cyclized amphiphiles

From luminescent π-conjugated macrocycles to bridged multi-cyclic π-conjugated polymers: cyclic topology, aggregation-induced emission, and explosive sensing

Organocatalytic Stereoselective Cyclic Polylactide Synthesis in Supercritical Carbon Dioxide under Plasticizing Conditions

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