Synthesis and properties of elastomeric ionenes I. Polybutadiene ionenes

Yamashita, Shinzo; Itoi, Masaaki; Kohjiya, Shinzo; Kidera, Akinori

doi:10.1002/app.1988.070350718

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…Lastly, Wilkes, Winey, and Long synthesized PDMS based backbone PILs and demonstrated a systematic tunability of mechanical properties depending on the ratio of siloxane to xylene spacers between charges . Step growth approaches can be used to make precise backbone PILs where the spacer is exactly the same length between all of the charged groups. , The ability to synthesize polymers that incorporate imidazolium cations either directly into the backbone or as a pendant side chain PIL provides a direct probe of the role of charge placement on structure and conductivity in ionic polymers.…”

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“…30 Step growth approaches can be used to make precise backbone PILs where the spacer is exactly the same length between all of the charged groups. 31,32 The ability to synthesize polymers that incorporate imidazolium cations either directly into the backbone or as a pendant side chain PIL provides a direct probe of the role of charge placement on structure and conductivity in ionic polymers.…”

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Role of Tethered Ion Placement on Polymerized Ionic Liquid Structure and Conductivity: Pendant versus Backbone Charge Placement

Evans¹,

Bridges²,

Sanoja

et al. 2016

ACS Macro Lett.

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The role of ion placement was systematically investigated in imidazolium bis(trifluoromethane)sulfonimide (ImTFSI) polymerized ionic liquids (PILs) containing pendant charges and charges in the backbone (sometimes called ionenes). The backbone PILs were synthesized via a facile step growth route, and pendant PILs were synthesized via RAFT. Both PILs were designed to have nearly identical charge density, and the conductivity was found to be substantially enhanced in the backbone PIL systems even after accounting for differences in the glass transition temperature (T g). Wide-angle X-ray scattering (WAXS) revealed an invariance in the location of the amorphous halo between the two systems, while the anion–anion correlation peak was shifted to lower scattering wavevector (q) in the backbone PILs. This indicates an increase in the correlation length of ions and is consistent with charge transport along a more correlated pathway following the polymer backbone. Due to the linear nature of the backbone PILs, crystallization was observed and correlated with changes in conductivity. Upon crystallization, the conductivity dropped, and eventually, two populations of mobile ions were observed and attributed to ions in the amorphous and near-crystallite regions. The present work demonstrates the important role of ion placement on local structure and conductivity as well as the ability of backbone PILs to be used as controllable optical or dielectric materials based on crystallization or processing history.

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confidence: 99%

Role of Tethered Ion Placement on Polymerized Ionic Liquid Structure and Conductivity: Pendant versus Backbone Charge Placement

Evans¹,

Bridges²,

Sanoja

et al. 2016

ACS Macro Lett.

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Hydrophilic elastomer containing poly(tetrahydrofuran) segments and viologen units

Kohjiya

Hashimoto

Yamashita

1992

J of Applied Polymer Sci

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SYNOPSISElastomeric polymer consisting of poly ( oxytetramethylene ) segments and viologen units was prepared by living cationic polymerization of tetrahydrofuran ( T H F ) , followed by the end capping of the living polymer by 4,4'-bipyridine. The obtained ionene-type polymer ( P T V ) exhibited low tensile modulus and high tensile strength with large extensibility, i.e., it is a n excellent elastomer from its mechanical properties. The water swelling behavior and effects of water and the sort of counter anions on the tensile properties of PTV were investigated. PTV showed high hydrophilicity; e.g., the water content of PTV with bromide counter anions was ca. 40% after swelling in water a t 25°C for 24 h. However, even for the samples with such a high water content, PTVs displayed good elastomeric properties, although the tensile modulus and tensile strength were decreased with increase of water content. The hydrophilicity of PTV was found to depend on the kind of counter anions, which in turn determined the tensile properties of PTVs in a swollen state.

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Synthesis and characterization of molecular structure

Jérôme

Mazurek²

1997

Ionomers

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Synthesis and properties of elastomeric ionenes I. Polybutadiene ionenes

Cited by 6 publications

References 8 publications

Role of Tethered Ion Placement on Polymerized Ionic Liquid Structure and Conductivity: Pendant versus Backbone Charge Placement

Role of Tethered Ion Placement on Polymerized Ionic Liquid Structure and Conductivity: Pendant versus Backbone Charge Placement

Hydrophilic elastomer containing poly(tetrahydrofuran) segments and viologen units

Synthesis and characterization of molecular structure

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