Poly(methyl methacrylate) (PMMA) was anchored to multiporous poly(vinylidine fluoride) (PVDF) surface via electron beam preirradiation grafting technique to prepare PVDF/PMMA brushes. The conformation of the PVDF/PMMA brushes was verified through Attenuated total reflection‐Fourier transform infra red spectroscopy (ATR‐FTIR), energy dispersive X‐ray spectroscopy (EDX), and scanning electron microscopy (SEM). Thermal stability of PVDF/PMMA brushes was characterized by thermo gravimetric analysis (TGA). The degradation of PVDF/PMMA brushes showed a two‐step pattern. PVDF/PMMA brushes membrane could be used as polymer electrolyte in lithium‐ion rechargeable batteries after it was activated by uptaking 1 M LiPF6/EC‐DMC (ethylene carbonate/dimethyl carbonate; EC:DMC = 1:1 by volume) electrolyte solution. The activated membrane showed high ionic conductivity, 6.1 × 10−3 S cm−1 at room temperature, and a good electrochemical stability up to 5.0 V. The excellent performances of multiporous PVDF‐g‐PMMA membranes suggest that they are suitable for application in high‐performance lithium‐ion batteries. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 751–758, 2008

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Novel gel network polymer electrolytes containing fluorine and sulfonic acid lithium were prepared by the ultraviolet polymerization of poly(ethylene glycol) dimethyl acrylate, 2-acrylamido-2-methyl propanesulfonic acid, and trifluoroethyl methacrylate. The network polymer was activated with 1.0M LiPF 6 /ethylene carbonate/ dimethyl carbonate solutions (ethylene carbonate/dimethyl carbonate 5 1 : 1 v/v) to prepare gel network polymer electrolytes. The characteristics of the polymer networks, including the gel fractions, thermal stability, liquid electrolyte uptake, and electrochemical properties, were studied. When the poly(ethylene glycol) dimethylacrylate/2-acrylamido-2-methyl propanesulfonic acid/trifluoroethyl methacrylate weight ratio was 60 : 35 : 5, the network polymer electrolytes showed the highest liquid electrolyte uptake (144%) and ionic conductivity (ca. 10 23 S/cm) at room temperature (258C). The network polymer electrolytes were electrochemically stable up to 5.0 V versus Li 1 /Li. The excellent performances of the network polymer electrolytes suggest that they are suitable for application in high-performance lithium-ion batteries.

UV-induced graft copolymerization with mixed monomers such as styrene (St) and maleic anhydride (MAH) onto the surface of polyethylene-terephthalate (PET) films was carried out. The chemical properties and the morphology of the surface of grafted films were investigated via attenuated total reflection (ATR) , scanning electron microscopy (SEM), and atomic force microscopy (AFM) techniques. ATR images revealed that MAH was succeeded in being grafted. On the other hand, SEM and AFM analysis showed that many granules, which may be grafted St and MAH chains, formed after being treated for 40 s by UV light. The water contact angle of grafted film is about 43°,which reduced sharply compared with pristine film. UV spectra of CTC, which was formed by St and MAH, provided the argument about the mechanism of formation of grafted chains.