Polycarbosilanes

Matsumoto, Kozo

doi:10.1002/0471440264.pst428

Cited by 3 publications

(3 citation statements)

References 88 publications

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“…Polycarbosilanes have many unique properties such as high flexibility, excellent thermal stability, chemical and electrochemical stability, , so they can be potential key polymers for novel functional materials. We recently reported applications of polycarbosilanes to prepare gel polymer electrolytes for lithium ion batteries and to other soft network-forming materials. , We have also investigated polycarbosilanes having sugar-derived structures in the polymer side chains and evaluated whether they could be used as biocompatible materials …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Polycarbosilanes Having 5-Membered Cyclic Carbonate Groups as Solid Polymer Electrolytes

et al. 2016

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We conducted ring-opening polymerization of silacyclobutane monomers 1-[2-(2,4-dioxa-3-pentanoyl)ethyl]-1methylsilacyclobutane (SBMC) and 1,1-di[2-(2,4-dioxa-3-pentanoyl)ethyl]silacyclobutane (SBDC) to obtain polySBMC and polySBDC, respectively, and measured their ionic conductivity with addition of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) or lithium trifluoromethanesulfonate (LiOTf). The ionic conductivity of both polySBMC and polySBDC increased with the increase in the amount of LiTFSI added. The ionic conductivity of polySBMC decreased with the increase in the amount of LiTOf, and that of polySBDC decreased after an increase. PolySBMC and polySBDC showed ionic conductivity of 6.1 × 10 −5 and 1.5 × 10 −4 S/cm at 30 °C, respectively, after the addition of 4 mol equiv of LiTFSI per cyclic carbonate. Differential scanning calorimetry analysis of the polymer revealed that the polymers with a high LiTFSI content formed a crystalline phase around room temperature, but the glass transition temperatures of the amorphous phases were kept low. Infrared analysis suggested the existence of a strong interaction between carbonate carbonyl groups and lithium cations.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Polycarbosilanes Having 5-Membered Cyclic Carbonate Groups as Solid Polymer Electrolytes

et al. 2016

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“…Since polymer-derived amorphous silicon (oxy)carbide (SiC and SiCO) show excellent thermal and chemical stabilities [ 28 , 29 ], PDS [ 30 ], PCSs [ 31 , 32 , 33 , 34 , 35 , 36 , 37 ] and PCS derivatives such as allyl-hydro-polycarbosilane (AHPCS) [ 38 , 39 , 40 , 41 , 42 ] have been applied as precursors of microporous amorphous SiOC [ 30 , 31 , 32 , 33 , 34 ] and SiC [ 29 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ] membranes to investigate their gas permeation properties mainly at high temperatures, T ≥ 200 °C. PCSs are also appropriate as functional Class II hybrids: The silicon-carbon (Si-C) backbone endows several attractive properties of PCSs such as high flexibility and excellent thermal, chemical and electrical stabilities [ 43 , 44 , 45 ]. The hydrocarbon groups attached to the Si-C backbone provide room temperature stability in air and PCSs can be applied as an active binder for the formation of powder compact to fabricate polycrystalline SiC ceramics [ 46 , 47 , 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes

et al. 2020

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Solar hydrogen production via the photoelectrochemical water-splitting reaction is attractive as one of the environmental-friendly approaches for producing H2. Since the reaction simultaneously generates H2 and O2, this method requires immediate H2 recovery from the syngas including O2 under high-humidity conditions around 50 °C. In this study, a supported mesoporous γ-Al2O3 membrane was modified with allyl-hydrido-polycarbosilane as a preceramic polymer and subsequently heat-treated in Ar to deliver a ternary SiCH organic–inorganic hybrid/γ-Al2O3 composite membrane. Relations between the polymer/hybrid conversion temperature, hydrophobicity, and H2 affinity of the polymer-derived SiCH hybrids were studied to functionalize the composite membranes as H2-selective under saturated water vapor partial pressure at 50 °C. As a result, the composite membranes synthesized at temperatures as low as 300–500 °C showed a H2 permeance of 1.0–4.3 × 10−7 mol m−2 s−1 Pa−1 with a H2/N2 selectivity of 6.0–11.3 under a mixed H2-N2 (2:1) feed gas flow. Further modification by the 120 °C-melt impregnation of low molecular weight polycarbosilane successfully improved the H2-permselectivity of the 500 °C-synthesized composite membrane by maintaining the H2 permeance combined with improved H2/N2 selectivity as 3.5 × 10−7 mol m−2 s−1 Pa−1 with 36. These results revealed a great potential of the polymer-derived SiCH hybrids as novel hydrophobic membranes for purification of solar hydrogen.

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“…Polycarbosilane, whose backbone consists of a silicon‐carbon bond, is highly flexible and thermally stable (Figure ) . It is also chemically and electrochemically stable.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Ring‐Opening Polymerization of Functional Silacyclobutane Derivatives and Their Application to Lithium Ion Batteries

Matsumoto

Endō

2015

Macromolecular Symposia

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Summary Polycarbosilanes, which have a carbon‐silicone backbone, are highly flexible polymers with excellent thermal, chemical, and electrical stability. They can be readily prepared by ring‐opening polymerization of silacyclobutane derivatives. Although polysilacycobutanes are non‐polar in general, they can be compatible to carbonate‐based electrolyte solutions by introducing a 5‐membered cyclic carbonate structure as a pendant group, and if properly designed they can be promising candidates as gelators to prepare gel polymer electrolytes (GPE). We designed a new carbosilane‐based GPE system, which could be prepared by ring‐opening polymerization of a silacyclobutane having a 5‐membered cyclic carbonate structure, 4‐{2‐(1‐methylsilacyclobutyl)}ethyl‐1,3‐dioxolane‐2‐one (SBMC). The GPEs were directly synthesized by copolymerization of the monomer with a crosslinker, 1,6‐bis(1‐methylsilacyclobutyl)hexane (HMBS), in situ of a battery electrolyte solution consisting of 1 M LiPF6 in an ethylene carbonate (EC) / diethyl carbonate (DEC) mixed solvent. The obtained GPE showed relatively high ionic conductivity compared to usual liquid electrolytes, and the lithium ion batteries composed of this GPE showed charge/discharge performance as high as those composed of the usual liquid electrolyte.

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Polycarbosilanes

Cited by 3 publications

References 88 publications

Synthesis and Properties of Polycarbosilanes Having 5-Membered Cyclic Carbonate Groups as Solid Polymer Electrolytes

Synthesis and Properties of Polycarbosilanes Having 5-Membered Cyclic Carbonate Groups as Solid Polymer Electrolytes

Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes

Synthesis and Ring‐Opening Polymerization of Functional Silacyclobutane Derivatives and Their Application to Lithium Ion Batteries

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