Thomas, Kurian; Jacob, Samuel; Thommachan, Xavier(Wiley Periodicals, December , 2001)
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Abstract:
High styrene rubber ionomers were prepared by sulfonating styrene–butadiene
rubber of high styrene content (high styrene rubber) in 1,2-dichloroethane using
acetyl sulfate reagent, followed by neutralization of the precursor acids using methanolic
zinc acetate. The ionomers were characterized using X-ray fluorescence spectroscopy,
Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance
spectroscopy (NMR), dynamic mechanical analysis (DMA), and also by the evaluation
of mechanical properties. The FTIR studies of the ionomer reveal that the sulfonate
groups are attached to the benzene ring. The NMR spectra give credence to this
observation. Results of DMA show an ionic transition (Ti) in addition to glass–rubber
transition (Tg). Incorporation of ionic groups results in improved mechanical properties
as well as retention of properties after three cycles of processing
Description:
Journal of Applied Polymer Science, Vol. 85, 2294–2300 (2002)