Synthesis and properties of unsaturated polyoxyethylene and its graft copolymers with styrene

✍ Scribed by Hong-Quan Xie; Dong Xie; Yong Liu

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 218 KB
• Volume: 70
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19981219)70:12<2417::aid-app14>3.0.co;2-x

✦ Synopsis

The unsaturated polyoxyethylene (PEO) was synthesized by copolymerization of ethylene oxide with allyl glycidyl ether in toluene using bimetallic-oxo-alkoxide as a catalyst. The effects of polymerization conditions on conversion and intrinsic viscosity of the copolymer were studied. The unsaturated copolymer was characterized with infrared spectra, 1 H NMR, and wide-angle X-ray diffraction. The relationship between crystallinity of the copolymers and conductivity of their LiClO 4 complexes were investigated. The copolymer with ϳ 65 wt % PEO content exhibits a room temperature conductivity of 1 ϫ 10 Ϫ4 S cm Ϫ1 at a molar ratio of EO/Li ϭ 20. The unsaturated PEO was graft-copolymerized with styrene using 2,2Ј-azobis(isobutyronitrile) as initiator in toluene, with grafting efficiency ϳ 50%. The purified graft copolymer was characterized with infrared spectra, 1 H NMR, and wide-angle X-ray diffraction, and was shown to have good emulsifying properties and a phase-transfer catalytic property. LiClO 4 complex of the graft copolymer with 70 wt % PEO content exhibits a room temperature conductivity approaching 1 ϫ 10 Ϫ4 S cm Ϫ1 at molar ratio of EO/Li ϭ 20/1.