title: FTIR spectra of plasticized grafted natural rubber-LiCF3SO3 electrolytes.
abstract: Chemical modification of natural rubber (NR) has frequently been attempted to improve the performance in specific application. 30% poly(methyl metacrylate) (PMMA) grafted into NR (MG30) has been explored as a potential candidate for polymer electrolytes. The complexation effect of salt and plasticizer in polymer host electrolytes had been investigated using FTIR. The carbonyl stretch of MG30 locates at 1729 cm-1, with the addition of lithium trimethanesulfonate (LiCF3SO3) salt, new band evolves at lower frequency region at 1643-1645 cm-1. The nondegenerate vibrational mode of nus(SO3) of salted electrolytes appearing at 1031-1034 cm-1 comes from 'free' trimethanesulfonate anions and the 1040-1046 cm-1 absorption from the monodentate ion paired with triflates. These indicate MG30-salt interaction. When MG30 and ethylene carbonate (EC) formed film, the CH3 asymmetric bend of MG30 appearing at 1447cm-1 is shifted to 1449 cm-1 in the EC-polymer complex. The CO stretching at 1729 cm-1 also shifted to 1728 cm-1. Hence, the EC-MG30 system is complexed to each other. EC-LiCF3SO3 interactions are indicated by the shifting of CO bending band of EC from 718 cm-1 being shifted to 720 cm-1 in the complex. In Li+-EC interaction where the ring breathing region at 897 cm-1 in EC has shifted to 899 cm-1 in EC-salt spectrum. The band appearing at 1643-1645 cm-1 due to the coordination of Li+<--O-C is still under observation and new peaks at 1779 and 1809 cm-1 are responsible to the carbonyl stretches of EC in plasticized salt-polymer electrolytes.
authors.affiliation: Chemistry Department, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia. kumuthak@hotmail.com
authors.forename: K
authors.initials: K
authors.lastname: Kumutha
authors.forename: Y
authors.initials: Y
authors.lastname: Alias
mesh_terms: D003978:Diazomethane / Q000031:analogs & derivatives* / Q000737:chemistry; D004573:Electrolytes / Q000737:chemistry*; D045782:Hemiterpenes / Q000737:chemistry; D007840:Latex / Q000737:chemistry; D008698:Mesylates / Q000737:chemistry*; D010968:Plasticizers / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012408:Rubber / Q000737:chemistry*; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared; D014297:Trimethylsilyl Compounds / Q000737:chemistry*
chemical_list: C451480:(trimethylsilyl)diazaomethane; D004573:Electrolytes; D045782:Hemiterpenes; D007840:Latex; D008698:Mesylates; D010968:Plasticizers; D014297:Trimethylsilyl Compounds; D003978:Diazomethane; C455100:1,4-polyisoprene; D012408:Rubber; D019904:Polymethyl Methacrylate