Self-Threading and Dethreading Dynamics of Poly(ethylene glycol)-Substituted Cyclodextrins with Different Chain Lengths

Inoue, Youhei; Miyauchi, Masahiko; Nakajima, Hiroki; Takashima, Yoshinori; Yamaguchi, Hiroyasu; Harada, Akira

doi:10.1021/ma070095q

Cited by 26 publications

(15 citation statements)

References 44 publications

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“…Inoue et al 195,196 expanded the study to 6-PEGacid-HyCiO-b-CD with a variety of PEG lengths. A 1-adamantane carboxylic acid (AdCA) molecule was used as a competitive guest for the CD cavity.…”

Section: Photo-responsive Inclusion Complexesmentioning

confidence: 99%

Cyclodextrin-assisted assembly of stimuli-responsive polymers in aqueous media

Yuen

Tam

2010

Soft Matter

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This review explores the advances in stimuli-responsive polymeric inclusion complexes, comprising of cyclodextrins, in aqueous media. Cyclodextrin complexation allows these polymeric systems to possess tailored physical properties that permit them to form novel supramolecular structures. By including and combining stimuli-responsive characteristics, these special systems can transform into various morphologies when exposed to different kinds of external stimuli. A wide variety of these stimuliresponsive polyrotaxanes and functionalized cyclodextrin polymers that possess interesting supramolecular characteristics are discussed, with specific focus on pH-, temperature-, photo-and redox-sensitive systems. These unusual polymer/cyclodextrin systems provide a basis for many useful applications, such as drug delivery, environmentally friendly coatings, personal home care products, separation processes, food processing, and microelectronics.

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Section: Photo-responsive Inclusion Complexesmentioning

confidence: 99%

Cyclodextrin-assisted assembly of stimuli-responsive polymers in aqueous media

Yuen

Tam

2010

Soft Matter

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“…Although many reports on the preparation, characterization, and application of polymer/CD based poly- pseudo -rotaxanes and polyrotaxanes have been published, the threading mechanism and dynamics of a linear polymer in CDs have yet to be revealed . However, this issue is essential and significant for dynamics of polymers in solution. , On the other hand, physical and chemical characters as well as behaviors in aqueous solution of Hy-α-CD are different from that of α-CD due to the substitution. And there are few researches about the complexation between polymers and substituted CD.…”

Section: Resultsmentioning

confidence: 99%

“…These results indicate that Hy-α-CDs form inclusion complexes. In addition, δ C3 (Blank) and δ C5 (Blank) show concentration dependency, so the chemical shift variations cannot be attributed to the formation of intramolecular complex . The methyl part on the 2-hydroxypropyl group of one Hy-α-CD can insert into the cavity of another Hy-α-CD shallowly from both wide and narrow rims driven by hydrophobic interaction.…”

Section: Resultsmentioning

confidence: 99%

“…40 However, this issue is essential and significant for dynamics of polymers in solution. 41,42 On the other hand, physical and chemical characters as well as behaviors in aqueous solution of Hy-α-CD are different from that of α-CD due to the substitution. And there are few researches about the complexation between polymers and substituted CD.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Preparation of a High-Strength Hydrogel with Slidable and Tunable Potential Functionalization Sites

Zheng

et al. 2015

Macromolecules

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A hydrogel with tunable potential functionalization sites has been successfully prepared. As potential functionalization sites, (2-hydroxypropyl)-α-CDs (Hy-α-CDs) were introduced into the network of tetrahedron-like poly(ethylene glycol) (tetra-PEG) gel through supramolecular chemistry. In the stage of complexation, poly-pseudo-rotaxane consisting of tetra-PEG macromonomer and Hy-α-CD formed in pregel solution. The dynamic complexation process and the structure of the poly-pseudo-rotaxane were investigated by NMR experiment. In the stage of gelation, some cross-linking reactions were completed through click chemistry. The structures and mechanical properties of the resultant hydrogels were characterized by ATR-FTIR, XPS, SEM, and compression test in detail. The number of Hy-α-CD introduced into the hydrogel is related closely to the structure of the poly-pseudo-rotaxane and can be controlled easily by tuning the feed ratio. Anthracene as an example of function was introduced into the hydrogel through Hy-α-CD to preliminarily demonstrate the validity of the potential functionalization site in the last, and the hydrogel also has the capacity for further diverse functionalization.

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“…Inoue and colleagues, connected β‐CD and cinnamoyl moiety carrying oligo(ethylene glycol) (OEG), in which the β‐CD moiety included strongly the cinnamoyl moiety. When a half equivalent of 1‐adamantanecarboxylic acid (AdCA) was added to the β‐CD modified with cinnamoyl OEG, the exchange between inclusion and dissociation states was observed by NMR (Scheme ).…”

Section: Rotaxanes and Pseudorotaxanesmentioning

confidence: 99%

Cyclodextrin‐Based Rotaxanes: from Rotaxanes to Polyrotaxanes and Further to Functional Materials

2019

Self Cite

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This minireview overviews rotaxanes and pseudorotaxanes containing cyclodextrins (CDs) as the rotor component. Since CDs interact with molecules, e.g., hydrophobic compounds of the size and shape matching their cavity, to form inclusion complexes in aqueous media, CDs are an important class of macrocyclic compounds as rotor components of rotaxanes and pseudorotaxanes. Research on CD‐based rotaxanes has begun with the synthesis of rotaxanes from low molecular weight axis molecules and then developed into the construction of molecular machines and polyrotaxanes. Recently, the research has further developed into macroscopic functional materials, e.g., slide‐ring gels, macromolecular assemblies, self‐healing materials, and soft actuators. In the present article, typical examples of CD‐based rotaxanes and pseudorotaxanes are described; synthesis of rotaxane and construction of molecular machine are described in Section 2, synthesis of polyrotaxanes is dealt with in Section 3, and development of macroscopic functional materials based on rotaxane structure is discussed in Section 4.

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Self-Threading and Dethreading Dynamics of Poly(ethylene glycol)-Substituted Cyclodextrins with Different Chain Lengths

Cited by 26 publications

References 44 publications

Cyclodextrin-assisted assembly of stimuli-responsive polymers in aqueous media

Cyclodextrin-assisted assembly of stimuli-responsive polymers in aqueous media

Preparation of a High-Strength Hydrogel with Slidable and Tunable Potential Functionalization Sites

Cyclodextrin‐Based Rotaxanes: from Rotaxanes to Polyrotaxanes and Further to Functional Materials

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