1 research outputs found
Synthesis of HardâSoftâHard Triblock Copolymers, Poly(2-naphthyl glycidyl ether)-<i>block</i>-poly[2-(2-(2-methoxyethoxy)ethoxy)ethyl glycidyl ether]-<i>block</i>-poly(2-naphthyl glycidyl ether), for Solid Electrolytes
Hardâsoftâhard
triblock copolymers based on polyÂ(ethylene
oxide) (PEO), polyÂ(2-naphthyl glycidyl ether)-<i>block</i>-polyÂ[2-(2-(2-methoxyÂethoxy)Âethoxy)Âethyl glycidyl ether]-<i>block</i>-polyÂ(2-naphthyl glycidyl ether)Âs (PNG-PTG-PNGs), were
synthesized by sequential ring-opening polymerization of 2-(2-(2-methoxyÂethoxy)Âethoxy)Âethyl
glycidyl ether and 2-naphthyl glycidyl ether using a bidirectional
initiator catalyzed by a phosphazene base. Four PNG-PTG-PNGs had different
block compositions (<i>f</i><sub>wt,PNG</sub> = 9.2â28.6
wt %), controlled molecular weights (<i>M</i><sub>n</sub> = 23.9â30.9 kDa), and narrow dispersities (<i>Ä</i> = 1.11â1.14). Most of the PNG-PTG-PNG electrolytes had much
higher Li<sup>+</sup> conductivities than that of a PEO electrolyte
(6.54 Ă 10<sup>â7</sup> S cm<sup>â1</sup>) at room
temperature. Eespecially, the Li<sup>+</sup> conductivity of PNG<sub>18</sub>-PTG<sub>107</sub>-PNG<sub>18</sub> electrolyte (9.5 Ă
10<sup>â5</sup> S cm<sup>â1</sup> for <i>f</i><sub>wt,PNG</sub> = 28.6 wt %) was comparable to one of a PTG electrolyte
(1.11 Ă 10<sup>â4</sup> S cm<sup>â1</sup>). The
Li<sup>+</sup> conductivities of PNG-PTG-PNG electrolytes were closely
correlated to efficient Li<sup>+</sup> transport channels formed by
the microphase separation into soft PTG and hard PNG domains