1
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Cai C, Yao G, Zhang Y, Zhang S, Li F, Tan Z, Dong S. Optically transparent and mechanically tough glass with impact resistance and flame retardancy enabled by covalent/supramolecular interactions. MATERIALS HORIZONS 2024. [PMID: 39252527 DOI: 10.1039/d4mh00750f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/11/2024]
Abstract
Exploring glass materials beyond inorganic components represents a new direction in the development of artificial transparent materials. Inspired by the successes of polymeric and supramolecular glasses, we shifted our attention to the preparation of a transparent glass through the polymerization of low-molecular-weight monomers that are naturally tailored with noncovalent recognition motifs. In this work, an imidazolium unit bearing a vinyl group and a tetrafluoroborate counter anion was selected to construct an artificial glass. Experimental and theoretical investigations revealed that the cross-linking behavior of anions effectively transformed linear polymeric chains into three-dimensional networks. The polymeric-supramolecular glass exhibits a tough tensile strength (61.31 MPa), high Young's modulus (1.17 GPa), and good optical transparency (>90%), which are comparable to those of polymethyl methacrylate. Moreover, the obtained glass maintains excellent mechanical toughness and optical transparency over a wide temperature range (from -150 to 150 °C). The material shows a superior impact resistance (18.34 kJ m-2) and flame retardancy (V0 rating), which are barely achieved by supramolecular materials.
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Affiliation(s)
- Changyong Cai
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, Hunan, P. R. China.
| | - Guohong Yao
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China.
| | - Yunfei Zhang
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China.
| | - Shiguo Zhang
- College of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
| | - Fenfang Li
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, P. R. China
| | - Zhijian Tan
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, Hunan, P. R. China.
| | - Shengyi Dong
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, P. R. China.
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2
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Kato K, Ito K, Hoshino T. Strain-Induced Orientation of Host Rings that Determines the Sliding of Guest Polymers and Plasticity of Glassy Polyrotaxane. ACS Macro Lett 2024; 13:1094-1098. [PMID: 39121179 PMCID: PMC11340018 DOI: 10.1021/acsmacrolett.4c00369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2024] [Revised: 07/15/2024] [Accepted: 07/17/2024] [Indexed: 08/11/2024]
Abstract
The unique motility of mechanically interlocked polymers enables their mechanical properties to profoundly transform. This property has been exploited less in glassy materials than in rubbery materials. This study demonstrated that in the glassy state the rings must orient before sliding and clarified the requisite structural changes by the synchrotron microbeam X-ray diffraction mapping of a ductile cyclodextrin (CD)-based glassy polyrotaxane. After inducing neck formation and propagation by uniaxial tension, the strain-localized area was scanned, elucidating how the CD orientation and its correlation distance change. As necking approaches and local strain increases, the CD rotational axis orients considerably in the tensile direction. Near the neck inflection point, polymer sliding triggers a sudden structural transformation, forming a phase-separated structure between the CDs and polymers that toughens the neck. This strain-induced orientation preceding sliding appears to facilitate sliding. In the rubbery state, host molecules can orient freely with the guest polymer orientation, but glassy materials must be designed to facilitate host orientation to enable guest sliding with minimum molecular friction.
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Affiliation(s)
- Kazuaki Kato
- Department
of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
- RIKEN
SPring-8 Center, 1-1-1,
Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Kohzo Ito
- Department
of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - Taiki Hoshino
- RIKEN
SPring-8 Center, 1-1-1,
Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- International
Center for Synchrotron Radiation Innovation Smart, Tohoku University, Sendai 980-8577, Japan
- Institute
of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Aoba-ku, Sendai 980-8577, Japan
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3
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Yao G, Pan Y, Li F, Dong S. Macrocyclic Supramolecular Glass: New Type of Supramolecular Transparent Materials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2405337. [PMID: 39073234 DOI: 10.1002/smll.202405337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2024] [Revised: 07/11/2024] [Indexed: 07/30/2024]
Abstract
Transparent materials are widely used in industries, everyday life, and scientific activities. The development of new, lightweight, and durable artificial transparent materials is a challenge in synthetic chemistry. In this study, a supramolecular approach is conceived to construct transparent glass. Cyclodextrins are selected as the building blocks for the fabrication of supramolecular glass via noncovalent polymerization. The newly formed glass displays several attractive advantages, including good thermal processability, high mechanical strength and dielectric constant, excellent visible light transparency, and good adhesion performance. Importantly, the structural characteristics of long-range disorder and short-range order are observed in cyclodextrin glass. Here a new strategy is presented for the preparation and functionalization of low-molecular-weight transparent materials.
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Affiliation(s)
- Guohong Yao
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Yanjuan Pan
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Fenfang Li
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Shengyi Dong
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
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4
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Du R, Bao T, Kong D, Zhang Q, Jia X. Cyclodextrins-Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials. Chempluschem 2024; 89:e202300706. [PMID: 38567455 DOI: 10.1002/cplu.202300706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/11/2024] [Accepted: 03/29/2024] [Indexed: 04/04/2024]
Abstract
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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Affiliation(s)
- Ruichun Du
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
| | - Tianwei Bao
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
| | - Deshuo Kong
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
| | - Qiuhong Zhang
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
- State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, P. R. China
| | - Xudong Jia
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
- State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, P. R. China
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5
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Kato K, Taniguchi M, Ito K. Tough Glass with Mechanical Bonding Network Anchored by High-Mobility Polymers. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Affiliation(s)
- Kazuaki Kato
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
- Research and Services Division of Materials Data and Integrated System, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Masayuki Taniguchi
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
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Chen L, Sheng X, Li G, Huang F. Mechanically interlocked polymers based on rotaxanes. Chem Soc Rev 2022; 51:7046-7065. [PMID: 35852571 DOI: 10.1039/d2cs00202g] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nature of mechanically interlocked molecules (MIMs) has continued to encourage researchers to design and construct a variety of high-performance materials. Introducing mechanically interlocked structures into polymers has led to novel polymeric materials, called mechanically interlocked polymers (MIPs). Rotaxane-based MIPs are an important class, where the mechanically interlocked characteristic retains a high degree of structural freedom and mobility of their components, such as the rotation and sliding motions of rotaxane units. Therefore, these MIP materials are known to possess a unique set of properties, including mechanical robustness, adaptability and responsiveness, which endow them with potential applications in many emerging fields, such as protective materials, intelligent actuators, and mechanisorption. In this review, we outline the synthetic strategies, structure-property relationships, and application explorations of various polyrotaxanes, including linear polyrotaxanes, polyrotaxane networks, and rotaxane dendrimers.
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Affiliation(s)
- Liya Chen
- Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
| | - Xinru Sheng
- Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
| | - Guangfeng Li
- Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310027, China. .,ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, 311215, P. R. China.
| | - Feihe Huang
- Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310027, China. .,ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, 311215, P. R. China. .,Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
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7
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Molero G, Liu C, Zhu Z, Chen Q, Peterson SR, Kolluru PV, Sue HJ, Uenuma S, Mayumi K, Ito K. Fracture Behavior of Polyrotaxane-Toughened Poly(Methyl Methacrylate). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2335-2345. [PMID: 35129976 DOI: 10.1021/acs.langmuir.1c03216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The fracture behavior of polyrotaxane (PR)-modified poly(methyl methacrylate) (PMMA) was investigated. PR is a supramolecule with rings threaded onto a linear backbone chain, which is capped by bulky end groups to prevent the rings from de-threading. The ring structure is α-cyclodextrin (CD), and it can be functionalized to enhance its affinity with the hosting polymer matrix. Adding only 1 wt % of PR containing methacrylate functional groups (mPR) at the terminal of some of the polycaprolactone-grafted chains on CD promotes massive crazing, resulting in a significant improvement in fracture toughness while maintaining the modulus and transparency of the PMMA matrix. Dynamic mechanical analysis and atomic force microscopy studies reveal that mPR strongly interact with PMMA, leading to higher molecular mobility and enhanced molecular cooperativity during deformation. This molecular cooperativity may be responsible for the formation of massive crazing in a PMMA matrix, which leads to greatly improved fracture toughness.
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Affiliation(s)
- Glendimar Molero
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Cong Liu
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Zewen Zhu
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Qihui Chen
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Suzanne R Peterson
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Pavan V Kolluru
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Hung-Jue Sue
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Shuntaro Uenuma
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba 227-8561, Japan
| | - Koichi Mayumi
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba 227-8561, Japan
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba 227-8561, Japan
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8
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Kato K, Mizusawa T, Ohara A, Ito K. Direct enhancement of intercomponent interactions in polyrotaxane and its pronounced effects on glass state properties. Chem Commun (Camb) 2021; 57:12472-12475. [PMID: 34730577 DOI: 10.1039/d1cc05516j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Strong interactions between the host cyclodextrin and the threading guest polymer were introduced by selective modifications to the polymer of a polybutadine-based polyrotaxane. The changes in the intercomponent interactions influenced the mobility of the threading polymer that was confined in the glassy host framework, resulting in different mechanical properties.
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Affiliation(s)
- Kazuaki Kato
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan. .,Research and Services Division of Materials Data and Integrated System, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Tomoki Mizusawa
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
| | - Akihiro Ohara
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
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9
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Dikshit K, Bruns CJ. Post-synthesis modification of slide-ring gels for thermal and mechanical reconfiguration. SOFT MATTER 2021; 17:5248-5257. [PMID: 33949424 DOI: 10.1039/d0sm02260h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Ring-sliding behavior in polyrotaxanes imbues gels, elastomers, and glasses with remarkable stress-dissipation and actuation properties. Since these properties can be modulated and tuned by structural parameters, many efforts have been devoted to developing synthetic protocols that define the structures and properties of slide-ring materials. We introduce post-synthetic modifications of slide-ring gels derived from unmodified α-cyclodextrin and poly(ethylene glycol) polyrotaxanes that enable (i) actuation and control of the thermo-responsive lower critical solution temperature (LCST) behavior of ring-modified slide-ring hydrogels, and (ii) chemically bonding separate gels into hybrid or shape-reconfigured macro-structures with a slide-ring adhesive solution. The mechanical properties of the post-modified gels have been characterized by shear rheology and uniaxial tensile tests, while the corresponding xerogels were characterized by wide-angle X-ray scattering. These demonstrations show that post-synthetic modification offers a practical solution for re-configuring the properties and shapes of slide-ring gels.
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Affiliation(s)
- Karan Dikshit
- Materials Science and Engineering Program, University of Colorado Boulder, Boulder, Colorado 80309, USA
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10
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11
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Kato K, Ohara A, Michishio K, Ito K. Effects of Ring Size on the Dynamics of Polyrotaxane Glass. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c02009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kazuaki Kato
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
- Research and Services Division of Materials Data and Integrated System, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Akihiro Ohara
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
| | - Koji Michishio
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
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12
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Anisimov AA, Drozdov FV, Vysochinskaya YS, Minyaylo EO, Peregudov AS, Dolgushin FM, Shchegolikhina OI, Muzafarov AM. Organoboron Derivatives of Stereoregular Phenylcyclosilsesquioxanes. Chemistry 2020; 26:11404-11407. [PMID: 32315105 DOI: 10.1002/chem.202001676] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 04/19/2020] [Indexed: 11/08/2022]
Abstract
This study presents the synthesis of organoboron derivatives of stereoregular 4-, 6-, and 12-unit phenylcyclosilsesquioxanes. All compounds obtained were isolated in good yields (70-80 %) and were fully characterized by 1 H, 13 C, 29 Si, 11 B NMR, IR spectroscopy, HRMS ESI, and elemental microanalysis. The structure of the key modifier, obtained for the first time, 4-(tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl) dimethylvinylsilane, was also confirmed by single-crystal XRD.
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Affiliation(s)
- Anton A Anisimov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow, Russia
| | - Fedor V Drozdov
- Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), Moscow, Russia
| | - Yulia S Vysochinskaya
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow, Russia.,Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), Moscow, Russia
| | - Ekaterina O Minyaylo
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow, Russia
| | - Alexander S Peregudov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow, Russia
| | - Fedor M Dolgushin
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow, Russia.,Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences (IGIC RAS), Moscow, Russia
| | - Olga I Shchegolikhina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow, Russia
| | - Aziz M Muzafarov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova St. 28, Moscow, Russia.,Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), Moscow, Russia
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13
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Kato K, Ito K, Hoshino T. Anisotropic Amorphous X-ray Diffraction Attributed to the Orientation of Cyclodextrin. J Phys Chem Lett 2020; 11:6201-6205. [PMID: 32692182 DOI: 10.1021/acs.jpclett.0c01987] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The beauty of cyclic molecules is reflected in their host-guest complexation reactions, as well as their unique X-ray diffraction patterns. Cyclodextrins, the longest known host molecules with rigid ring structures, show anisotropic X-ray diffraction characteristic of their single-molecule structure, rather than their intermolecular relationships. Amorphous derivatives of α-cyclodextrin exhibit broad and strong halo diffractions in the solid, melted, and dilute solution states. The diffraction angle corresponds to the intramolecular distance between neighboring glycosidic oxygen atoms located at the vertices of a regular hexagonal array. Because the hexagon is parallel to the aperture plane of the rigid cyclic molecule, the diffraction appears only in the direction parallel to this plane. The anisotropy was confirmed by stretching an amorphous thermoplastic polymer threaded through the inclusion cavities of a sequence of cyclodextrins. The resultant unique anisotropic X-ray diffraction suggests the possible use of rigid cyclic molecules as molecular orientation probes.
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Affiliation(s)
- Kazuaki Kato
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwa-noha, Kashiwa, Chiba 277-8561, Japan
- Research and Services Division of Materials Data and Integrated System, National Institute for Materials Science, 1-2-1 Sen-gen, Tsukuba, Ibaraki 305-0047, Japan
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwa-noha, Kashiwa, Chiba 277-8561, Japan
| | - Taiki Hoshino
- RIKEN SPring-8 Centre, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
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14
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Cho IS, Ooya T. Cell-Encapsulating Hydrogel Puzzle: Polyrotaxane-Based Self-Healing Hydrogels. Chemistry 2019; 26:913-920. [PMID: 31696616 DOI: 10.1002/chem.201904446] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/01/2019] [Indexed: 11/12/2022]
Abstract
Slide-ring hydrogels using polyrotaxanes have been developed as highly tough soft materials. However, they have never been used as biomaterials because of the lack of biocompatibility. Meanwhile, self-healing hydrogels are expected to improve fatigue resistance and extend the period of use. However, owing to the lack of high mechanical strength, they are limited in their use as biomaterials. Here we first developed a biocompatible self-healing/slide-ring hydrogel using glycol chitosan and a water-soluble polyrotaxane. We obtained excellent mechanical toughness and biocompatibility to promote the proliferation of human umbilical vein endothelial cells (HUVECs) encapsulated in the hydrogel. Owing to the rapid self-healing property, the cell-encapsulating gels adjusted arbitrarily, maintaining good cell proliferation function. Therefore, slide-ring hydrogels enable the use of biomaterials for soft-tissue engineering.
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Affiliation(s)
- Ik Sung Cho
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe, Japan
| | - Tooru Ooya
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe, Japan
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15
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Kato K, Ohara A, Yokoyama H, Ito K. Prolonged Glass Transition due to Topological Constraints in Polyrotaxanes. J Am Chem Soc 2019; 141:12502-12506. [PMID: 31368694 DOI: 10.1021/jacs.9b06063] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Topological constraints in polyrotaxanes significantly affected their glass transition dynamics. The effects of the constraints were systematically studied using a series of different coverage glass-forming polyrotaxanes consisting of a common polymer and threaded ring molecule of varying ratios. Although their ratios were similar and hence exhibited similar Tg values by differential thermal analysis, mechanical relaxation was considerably prolonged with increasing coverage. The relaxation became a two-step process: a faster step at a common temperature near the Tg and another which was prolonged by the coverage increase. Relaxation dynamics analysis revealed that segment motions, which are cooperative translations of different components, freeze at considerably higher temperatures than the Tg with increasing coverage. This suggests that although the rings are released from conventional interactions at the Tg, their cooperative translational motions are significantly constrained by the threading polymers with increasing coverage.
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Affiliation(s)
- Kazuaki Kato
- Department of Advanced Materials Science, Graduate School of Frontier Sciences , The University of Tokyo , 5-1-5 Kashiwanoha , Kashiwa , Chiba 277-8561 , Japan.,Research and Services Division of Materials Data and Integrated System , National Institute for Materials Science , 1-2-1 Sengen , Tsukuba , Ibaraki 305-0047 , Japan
| | - Akihiro Ohara
- Department of Advanced Materials Science, Graduate School of Frontier Sciences , The University of Tokyo , 5-1-5 Kashiwanoha , Kashiwa , Chiba 277-8561 , Japan
| | - Hideaki Yokoyama
- Department of Advanced Materials Science, Graduate School of Frontier Sciences , The University of Tokyo , 5-1-5 Kashiwanoha , Kashiwa , Chiba 277-8561 , Japan
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences , The University of Tokyo , 5-1-5 Kashiwanoha , Kashiwa , Chiba 277-8561 , Japan
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Pruksawan S, Samitsu S, Yokoyama H, Naito M. Homogeneously Dispersed Polyrotaxane in Epoxy Adhesive and Its Improvement in the Fracture Toughness. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02450] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Sirawit Pruksawan
- Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Program in Materials Science and Engineering, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1, Tenodai, Tsukuba, Ibaraki 305-8571, Japan
| | - Sadaki Samitsu
- Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Hideaki Yokoyama
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Toudaikasiwakyanpasu, Kashiwanoha, Kashiwa-shi, Chiba 277-8561, Japan
| | - Masanobu Naito
- Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Program in Materials Science and Engineering, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1, Tenodai, Tsukuba, Ibaraki 305-8571, Japan
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Toudaikasiwakyanpasu, Kashiwanoha, Kashiwa-shi, Chiba 277-8561, Japan
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Mena-Hernando S, Pérez EM. Mechanically interlocked materials. Rotaxanes and catenanes beyond the small molecule. Chem Soc Rev 2019; 48:5016-5032. [DOI: 10.1039/c8cs00888d] [Citation(s) in RCA: 109] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
An overview of the progress in mechanically interlocked materials is presented. In particular, we focus on polycatenanes, polyrotaxanes, metal–organic rotaxane frameworks (MORFs), and mechanically interlocked derivatives of carbon nanotubes (MINTs).
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Li G, Kato K, Mayumi K, Yokoyama H, Ito K. Efficient mechanical toughening of polylactic acid without substantial decreases in stiffness and transparency by the reactive grafting of polyrotaxanes. J INCL PHENOM MACRO 2018. [DOI: 10.1007/s10847-018-0857-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ohtsuka K, Zhao C. Properties of bismaleimide resin modified with polyrotaxane as a stress relaxation material. POLYM INT 2018. [DOI: 10.1002/pi.5619] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Keiko Ohtsuka
- Osaka Research Institute of Industrial Science and Technology; Osaka Japan
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