Phosphonium tetraphenyl borate

Synthesis of Poly[lsobutylene-co-(4-Methylstyrenyl, Triphenyl Phosphonium Tetraphenyl Borate)]... 

Figure 2. NMR Data, Poly[Isobutylene-co-(4-methylstyrenyl, triphenyl phosphonium tetraphenyl borate)]...

Phosphonium salts, which are generally stable in the form of iodide and tetraphenyl-borate crystalline solids, are frequently purified by recrystallization. Where this is not possible, thick-layer chromatography (0.2-1 mm Kieselguhr, silica) may afford a satisfactory method of purification12,13. In this manner, analysis using secondary ion mass spectrometry (SIMS) has a detection limit 10-50 ng per spot14. 

Mechanical Behavior. The ionomers, - poly[Isobutylene-co-(4-methyl styrenyl, triphenyl phosphonium bromide or tetraphenyl borate)] were found to be different in physical appearance(hard and strong) and tougher than the starting material, the Exxpro elastomer. The mechanical properties of these quaternary phosphonium... 

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