Star‐shaped polymers having side chain poss groups for solid polymer electrolytes; synthesis, thermal behavior, dimensional stability, and ionic conductivity

Abstract

A series of organic/inorganic hybrid star‐shaped polymers were synthesized by atom transfer radical polymerization using 3‐(3,5,7,9,11,13,15‐heptacyclohexyl‐pentacyclo[9.5.1.13,9.15,15.17,13]‐octasiloxane‐1‐yl)propyl methacrylate (MA‐POSS) and poly(ethylene glycol) methyl ether methacrylate (PEGMA) as monomers and octakis(2‐bromo‐2‐methylpropionoxypropyldimethylsiloxy)octasilsesquioxane as an initiator. Star‐shaped polymers with methyl methacrylate (MMA) and PEGMA moieties were also prepared for comparison purposes. Dimensionally stable freestanding film could be obtained from the hybrid star‐shaped polymer containing 26 wt % of MA‐POSS moieties although its glass transition temperature is very low, −60.9 °C. As a result, the hybrid star‐shaped polymer electrolyte containing lithium bis(trifluoromethanesulfonyl)imide showed ionic conductivities (1.75 × 10−5 S/cm at 30 °C), which were two orders of magnitude higher than those of the star‐shaped polymer electrolyte with MMA moieties. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

Poly(ethylene oxide)-based electrolytes for lithium-ion batteries

“…Structures of PEO derivatives based on POSS core.Recently, Lee et al72,517 synthesized a series of organic/inorganic hybrid star-shaped polymers (POSS-POEM, POSS-POEM-MAPOSS, and POSS-POEM-MMA) based on MA-POSS and POEM via ATRP as monomers, and investigated the thermal behaviors, dimensional stabilities, and ionic conductivities (~10 -5 S cm -1 at 30 o C) of the POSS-based electrolytes with LiTFSI salt. In 2014, they reported an organic/inorganic hybrid semi-IPN polymer electrolyte (HIPE) prepared by a photo crosslinking reaction of ethoxylated trimethylolpropane triacrylate (ETPTA) and functionalized POSS with acryloyl groups (OA-POSS) as crosslinkers, poly(ethylene oxide-co-ethylene carbonate) (PEOEC) polymer, LiClO 4 salt, and a photo initiator 518.…”

Solid Polymer Electrolytes Based on Functionalized Tannic Acids from Natural Resources for All‐Solid‐State Lithium‐Ion Batteries

“…[1][2][3] Commercialized liquid electrolytes that comprise lithium salts and carbonatebased organic solvents have safety issues such as leakage and flammability,e specially at elevated temperatures. [5][6][7][8][9][10] However,t he ionic conductivities of SPEs based on PEO are much smaller than those of liquid electrolytesd ue to the intrinsically lowm obility of polymer chains. [5][6][7][8][9][10] However,t he ionic conductivities of SPEs based on PEO are much smaller than those of liquid electrolytesd ue to the intrinsically lowm obility of polymer chains.…”

“…[4] To develop SPEs as an alternative for both separator and liquid electrolytes, poly(ethylene oxide) (PEO)-based polymerm aterials have been extensively studied because ethylene oxide groups can conductl ithium ions. [5][6][7][8][9][10] However,t he ionic conductivities of SPEs based on PEO are much smaller than those of liquid electrolytesd ue to the intrinsically lowm obility of polymer chains. Although the ionic conductivity of PEO-based SPEs can be increasedt hrough the use of PEO derivatives of small molecular weight, [11,12] freestanding films that have ac ertain degree of dimensionals tabilityc annotb ep repared from such derivatives because they are in aw axy state at room temperature.…”

POSS-based glycidyl methacrylate copolymer for transparent and permeable coatings

“…What is more, the shell substituents could offer immense opportunities for synthesis of organic-inorganic hybrid copolymers (5)(6)(7)(8)(9)(10)(11). It has been reported that the introduction of POSS into polymers can distinctly enhance the native polymer properties in glass transition temperature (13)(14), decomposition temperature (15), surface hardness, mechanical properties, flammability resistance and oxidation resistance attributed to the inorganic octahedral cage structure of POSS (16)(17)(18). However, there is a shortcoming that POSS is readily inclined to agglomerate (19)(20).…”