Photo-healable ion gel with improved mechanical properties using a tetra-arm diblock copolymer containing azobenzene groups

Ma, Xiaofeng; Usui, Ryoji; Kitazawa, Yuzo; Kokubo, Hisashi; Watanabe, Masayoshi

doi:10.1016/j.polymer.2015.09.058

Cited by 30 publications

(18 citation statements)

References 51 publications

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“…Based on the analysis of the stress-strain curves of the free-standing films, both their E' and σ T values are significantly lower than other (dry) PILs in the literature, which is expected given the a significant amount of free IL as a plasticizer in our PIL/IL composite materials [31,51]. However, our PIL/IL composite materials were comparable to or more flexible than other PIL/IL ion gel materials reported in the literature that utilized a PIL or nonionic polymer as the matrix material [15,28,[52][53][54][55]. The E' values reported for similar materials ranged from 0.011 to 89 MPa, while the σ T values ranged from 0.017 to 30 MPa.…”

Section: Preparation and Characterization Of Ammonium-based Pil/il Comentioning

confidence: 47%

Cross-linked, polyurethane-based, ammonium poly(ionic liquid)/ionic liquid composite films for organic vapor suppression and ion conduction

Mori

Martin

Noble

et al. 2017

Polymer

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A series of ammonium-diol and-triol ionic liquid (IL) monomers were synthesized and used in stepgrowth polymerization with the commercial di-isocyanate monomer, toluene-di-isocyanate (TDI), in the presence of free ammonium IL to form new curable ammonium-based polymerized ionic liquid/ionic liquid (PIL/IL) composite film coatings. The use of polyurethane chemistry allows for the near-complete curing of the alcohol and isocyanate monomers to yield solid, homogeneous, cross-linked polyurethanebased PIL/IL composite materials with no volatile side product formation. The physical properties and curing rates of these PIL/IL films were altered by tailoring the structures of the ammonium-alcohol IL monomers, the ratio of the linear vs. cross-linking IL monomers employed, and the amount of free IL in the curing reactions. Although ammonium-based PILs have been reported to be less thermally and electrochemically stable than their imidazolium counterparts in the literature, TGA results indicated a T onset of up to 300 °C under air for the ammonium PIL/IL composites prepared in this study. These new PIL/IL materials were also tested as curable coatings in a toxic industrial chemical (TIC) vapor suppression and liquid uptake assay using o-dichlorobenzene (o-DCB) as a simulant for polychlorinated biphenyls. The curable PIL/IL coatings were found to suppress 88% of the o-DCB vapor on o-DCBcontaminated painted steel substrates and 79% of the o-DCB vapor on o-DCB-contaminated rubber substrates, relative to uncoated control samples. However, although effective for TIC vapor suppression, these ammonium PIL/IL coatings only sorbed less than 50% of the applied liquid o-DCB from the same test substrates, making them slightly less effective for this latter application than previously reported imidazolium-based curable PIL/IL coatings. These materials exhibited comparable ionic conductivity values to other types of PIL/IL systems previously reported in the literature. However, it was found that the more heavily cross-linked ammonium-based PIL/IL films were more prone to free IL leach-out at higher temperatures, leading to their unexpectedly higher ionic conductivity at elevated temperatures.

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Section: Preparation and Characterization Of Ammonium-based Pil/il Comentioning

confidence: 47%

Cross-linked, polyurethane-based, ammonium poly(ionic liquid)/ionic liquid composite films for organic vapor suppression and ion conduction

Mori

Martin

Noble

et al. 2017

Polymer

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“…As viewed from mechanical properties, on the other hand, optically healable polymers are mostly gels and elastomers with poor load-bearing ability, 8,10,11,13,16,[18][19][20]26,27 not suitable for structural application. Therefore, development of higher strength, sunlight initiated self-healing polymer should be meaningful for practical usage as smart structural material.…”

Section: Introductionmentioning

confidence: 99%

Sunlight driven self-healing, reshaping and recycling of a robust, transparent and yellowing-resistant polymer

2016

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† Electronic Supplementary Information (ESI) available: FTIR spectra, Raman spectrum, 1 H NMR spectra, UV-visible spectra, mass spectrum, HPLC spectra, DSC heating curves, tensile stress-strain curves, effect of exposure time of xenon lamp light on Young's modulus, and tabulated mechanical properties and healing efficiencies. See For realizing sunlight stimulated self-healing, a crosslinked polyurethane carrying disulfide in the main chain is synthesized. Its macromolecular composition and architecture are optimized so that the included disulfide bonds can take part in exchange reaction simply under illumination of the low concentration UV component of sunlight. Accordingly, the damaged polymer is allowed to be repeatedly healed in the sun in terms of strength restoration as a result of phototriggered reversible exchange of disulfide bonds. Meanwhile, the elaborately introduced hydrogen bonding helps to quickly close crack, favoring intimate contacts of cracked surface and subsequent interaction of dangling chains across the interface, and eventually raising effectiveness of photo-reaction of the disulfide bonds in solid phase. In addition, networks rearrangement due to disulfide exchange enables multiple recycling and reshaping of the polymer under sunshine. The present proof-of-concept work would be hopefully developed into a cost-effective and environmentally friendly technology of design, fabrication and application of smart photo-sensitive polymer with higher mechanical strength.

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“…Because light is easily switchable, the above mentioned random copolymer could be utilized in stimuli‐responsive smart materials. To this end, we introduced a P(AzoMA‐ r ‐NIPAm) random copolymer segment into block copolymers and investigated their resultant phase transition behavior in ILs . Our recent results on a photo‐responsive ion gel of an ABA triblock copolymer consisting of the random copolymer as the A segment and IL‐soluble PEO as the B segment, (i. e., P(NIPAm‐ r ‐AzoMA)‐ b ‐PEO‐ b ‐P(AzoMA‐ r ‐NIPAm)), is highlighted.…”

Section: Stimuli Responsive Block Copolymers In Ionic Liquidsmentioning

confidence: 99%

“…(b) and (c) tan δ and storage modulus ( G′ ) of the ion gels at different polymer concentrations, respectively, measured at 25 °C under dark conditions. Measurements were taken at a strain γ =1 % and frequency ω =6.28 rad⋅s –1 . Reproduced from Ref.…”

Section: Stimuli Responsive Block Copolymers In Ionic Liquidsmentioning

confidence: 99%

Advanced Materials Based on Polymers and Ionic Liquids

Kitazawa

Ueno

Watanabe

2017

The Chemical Record

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Ionic liquids (ILs) are ambient temperature molten salts, which have attracted considerable attention owing to their unique properties. In this contribution, we review advanced materials composed of ILs and polymers for the basis of a new design protocol to fabricate novel materials. As electrolytes for electrochemical devices, cross-linked polymers containing ILs (ion gels) are endowed with functional properties inherited from ILs and mechanical consistency derived from polymers. To create such materials, micro-phase separation of block copolymers and colloidal arrays in the ILs are utilized. Based on the molecular design of task-specific ILs, the resultant ion gels are applicable as electrolytes for actuator, fuel cell, and secondary battery applications. Thermo- and photo-responsive polymers in ILs are also highlighted, whereby such stimuli elicit changes in the solubility of the self-assembly of block copolymers and colloidal arrays in the ILs. Further, thermo- and photo-reversible changes in the self-assembled structure can be exploited to demonstrate sol-gel transitions and fabricate photo-healable materials.

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Photo-healable ion gel with improved mechanical properties using a tetra-arm diblock copolymer containing azobenzene groups

Cited by 30 publications

References 51 publications

Cross-linked, polyurethane-based, ammonium poly(ionic liquid)/ionic liquid composite films for organic vapor suppression and ion conduction

Cross-linked, polyurethane-based, ammonium poly(ionic liquid)/ionic liquid composite films for organic vapor suppression and ion conduction

Sunlight driven self-healing, reshaping and recycling of a robust, transparent and yellowing-resistant polymer

Advanced Materials Based on Polymers and Ionic Liquids

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