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Single Radiation‐Induced Grafting Method for the Preparation of Two Proton‐ and Lithium Ion‐Conducting Membranes
Author(s) -
Nasef Mohamed Mahmoud,
Saidi Hamdani
Publication year - 2006
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200600131
Subject(s) - membrane , materials science , electrolyte , polymer chemistry , styrene , chemical engineering , lithium (medication) , thermal stability , polymer , crystallinity , polystyrene , grafting , copolymer , chemistry , composite material , medicine , biochemistry , electrode , engineering , endocrinology
Summary: Two distinct types of polymer electrolyte membranes for conducting protons and lithium ions have been prepared by a radiation‐induced grafting method. The polymer electrolyte precursor (PVDF‐ g ‐PS) is obtained by the simultaneous grafting of styrene onto poly(vinylidene fluoride) (PVDF) followed by one of two specific treatments. This includes sulfonation with a chlorosulfonic acid/dichloromethane mixture to obtain proton (H + )‐conducting membranes, or activation with LiPF 6 /EC/DC liquid electrolyte to obtain lithium ion (Li + )‐conducting membranes. The chemical structure of the obtained electrolyte membranes is verified by FT‐IR spectroscopy. Differential scanning calorimetry is used to examine the changes in the crystallinity and the thermal properties of both electrolyte membranes during the preparation process. The thermal stability of both electrolyte membranes is also evaluated using thermal gravimetrical analysis. The obtained polymer electrolyte membranes achieve superior conductivity values: 1.61 × 10 −3 S · cm −1 for Li + and 5.95 × 10 −2 S · cm −1 for H + at room temperature at a polystyrene content of 50%. The results of this work suggest that high quality H + ‐ and Li + ‐conducting membranes can be obtained using a single radiation‐induced grafting method.Schematic representation of the single root for preparation of Li + ‐ and H + ‐conducting membranes started by radiation‐induced grafting of styrene onto a PVDF film followed by chemical treatment.