Preparation and characteristics of natural rubber/poly(ethylene oxide) salt hybrid mixtures as novel polymer electrolytes
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Poly(ethylene oxide) (PEO) of molecular weight 1000 (PEO1000) containing lithium benzenesulfonate (LiBs) (PEO1000/LiBs), PEO derivatives having benzenesulfonate groups on both chain ends (PEO1000–(BSLi)2), or 1-ethyl-2,3-dimethylimidazolium bromide (ImB), were each blended with natural rubber (NR). The ionic conductivity was measured from AC impedance values. The ionic conductivity of the mixture of NR and PEO1000/LiBs (40 wt%) was about 10−6 S cm−1 at 50°C; this mixture retained rubbery physical previous termcharacteristics.next term At NR content of 10 wt%, the ionic conductivity of the mixture (NR/PEO1000/LiBs) was 2.7×10−5 Scm−1 at 50°C, approximately 10 times higher than that of the bulk PEO/LiBs mixture. For mixtures of NR and PEO1000–(BSLi)2, no improvement in ionic conductivity by mixing was found. The ionic conductivity of the mixture of NR and ImB was about 10 times higher than for the bulk of PEO1000–(BSLi)2 at a NR content of 10 wt%. We propose that the ionic conductivity of the mixture increases when an ion conducting matrix containing simple salt is added. On the other hand, the DSC curve for NR/PEO derivatives showed two Tgs based on the separate components, suggesting phase separation of the PEO derivative in the NR phase.
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