| SEBS, a versatile modified thermoplastic elastomer material, can be prepared byselectively hydrogenating to SBS. This modified copolymer possesses better properties thanSBS, for example, thermal oxidative and ultraviolet stability, as well as better flexibility,electrical insulativity and weathering resistance. So SEBS has been well-known as a new typeof elastomer material with broad application fields.Our research group has developed [Ru (COD) Cl2]n/TPP catalyst in situ and has foundthis catalyst exposing high activity and selectivity for hydrogenation of SBS. In the paper, [Ru(COD)Cl2]n/TPP catalyst was employed in hydrogenation of SBS with differentmicrostructures to prepare SEBS and the effects of reaction temperature, hydrogen pressure,molar ratio of P/Ru, concentration of catalyst, solvent and microstructure of SBS onhydrogenation degree of SBS were investigated and discussed in detail ,and hydrogenationreaction conditions were optimized by means of selective heating in different reaction timestage and adjusting solubility parameter and polarity of solvents, and so on. the optimalreaction condition was found. The degree of hydrogenation was calculated by IR or 1H-NMRspectrum and residual metal Ru in hydrogenated product was quantified by using inductivelycoupled plasma-atomic emission spectrometry (ICP-AES) method. The result showed that thedegree of hydrogenation can reach more than 98.0% under the optimized reaction conditionand no hydrogenation in benzene ring of hydrogenated product was observed by 1H-NMR andIR characterization technique, which showed high catalytic activity and selectivity forhydrogenation of SBS, and residual metal Ru in hydrogenated product was less than 2.5 ppm.The catalyst [Ru(COD)Cl2]n/TPP possesses so many merits, such as high activity, highselectivity, considerably stability and simple synthetic method, that the broad prospect ofindustrial application for hydrogenation of SBS can be predicted. |
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