Epoxy resins containing epoxy-modified polyrotaxanes

Hanafusa, Akihiro; Ando, Seiichiro; Yuge, Tetsuharu; Ozawa, Satoru; Ito, Masakazu; Hasegawa, Ryuichi; Yokoyama, Haruki; Mayumi, Koichi; Ito, Kohzo

doi:10.1016/j.polymer.2023.126007

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…Due to the unique crosslinking structure, polyrotaxane is also widely used in the field of engineering polymer materials. These materials would exhibit higher toughness due to the introduction of slidable crosslinking, such as polybenzoxazine, [101] epoxy resin, [17,36,102,103] polymethylmethacrylate, [104,105] and thermoset vitrimer. [106] Since these materials have been industrialized and also require large production, CDs-based polyrotaxanes, as currently affordable and easily available polyrotaxanes, are the most suitable supramolecular topological crosslinker to be introduced into these traditional materials.…”

Section: Engineering Polymersmentioning

confidence: 99%

“…For instance, Naito et al [103] prepared an epoxy adhesive with improved fracture toughness by introducing homogeneously dispersed polyrotaxanes (Figure 8b). Ito et al [17] modified the side chains of the polyrotaxane (PRÀ E) with epoxy terminated polycaprolactone (PCL) to enable its successful incorporation into the cross-linked epoxy resin network. Covalent bonding of PRÀ E to epoxy resin enhanced mechanical properties.…”

Section: Engineering Polymersmentioning

confidence: 99%

“…Among all guest polymer chains, PEG, renowned for its water solubility and biocompati-bility, is extensively used in the construction of cyclodextrin polyrotaxanes. [12] CDs-based polyrotaxanes with further rational modification (such as acetylation, [13,14] acrylation [15,16] and hydroxypropylation) [17][18][19] can dissolve in more organic solvents, so that they can readily be introduced into polymers. Different from the covalent or noncovalent crosslinking, the unique ringaxis structure would form an interlocked but slidable crosslinking in polymer networks.…”

Section: Introductionmentioning

confidence: 99%

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Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

Du,

Bao,

Kong

et al. 2024

ChemPlusChem

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The concept of polyrotaxane comes from the rotaxane structure in the supramolecular field. It is a mechanically interlocked supramolecular assembly composed of linear polymer chains and cyclic molecules. Over recent decades, the synthesis and application of polyrotaxanes have seen remarkable growth. Particularly, cyclodextrin‐based polyrotaxanes have been extensively reported due to the low‐price raw materials, good biocompatibility, and ease of modification. Hence, it is also one of the most promising mechanically interlocking supramolecules for wide industrialization in the future. Polyrotaxanes are widely introduced into materials such as elastomers, hydrogels, and engineering polymers to improve their mechanical properties or impart functionality to the materials. In these materials, polyrotaxane acts as a slidable cross‐linker to dissipate energy through sliding or assist in dispersing stress concentration in the cross‐linked network, thereby enhancing the toughness of the materials. Further, the unique sliding‐ring effect of cyclodextrin‐based polyrotaxanes has pioneered advancements in stretchable electronics and energy storage materials. This includes their innovative use in stretchable conductive composite and binders for anodes, addressing critical challenges in these fields. In this mini‐review, our focus is to highlight the current progress and potential wider applications in the future, underlining their transformative impact across various domains of material science.

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Section: Engineering Polymersmentioning

confidence: 99%

Section: Engineering Polymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

Du,

Bao,

Kong

et al. 2024

ChemPlusChem

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A polar polyimide as multifunctional flame retardant for epoxy resin through constructing intimate 3D interpenetrating polymer network

Fan,

Noh,

Zhuang

et al. 2023

European Polymer Journal

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Effect of Number Density of Epoxy Functional Groups on Reaction Kinetics for Epoxy Resin

Tokunaga,

Shundo,

Kuwahara

et al. 2024

Macromolecules

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Improving the heat resistance of epoxy resins remains an important and challenging issue across a wide variety of applications. One strategy to address this challenge is the design of cured resins based on multifunctional epoxy. Compared to conventional difunctional epoxy resins, multifunctional epoxy resins are expected to easily form a highly cross-linking structure, which is anticipated to contribute to enhanced heat resistance. However, there is a lack of information about the detailed mechanisms of the formation of such cross-linking structures and their effects on the physical properties. We herein tracked the kinetics of curing reactions of difunctional and trifunctional epoxies with an amine hardener. Despite the identical reactivity of epoxy groups in both base monomers, the trifunctional epoxy system cured faster. In addition, in the difunctional epoxy system, gelation was followed by vitrification, while in the trifunctional epoxy system, gelation and vitrification occurred simultaneously. The accelerated curing reaction observed in the trifunctional epoxy system could be explained in terms of the localized temperature increase from the reaction heat, which subsequently accelerated the following reactions. The resulting post-cured trifunctional epoxy resin did not exhibit a clear glass transition. This, so-called T g -less behavior was due to the glass transition temperature of the trifunctional epoxy unit being higher than its decomposition temperature. This mechanism for the T g -less behavior, combined with the accelerated curing reactions, provides valuable insights for the design of thermosetting resins with enhanced thermal stability.

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Epoxy resins containing epoxy-modified polyrotaxanes

Cited by 4 publications

References 32 publications

Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

A polar polyimide as multifunctional flame retardant for epoxy resin through constructing intimate 3D interpenetrating polymer network

Effect of Number Density of Epoxy Functional Groups on Reaction Kinetics for Epoxy Resin

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