Hydrogenation of C=C bonds in styrene-isoprene-styrene block copolymers in the presence of monocyclopentadienyl titanium(IV) catalytic systems

D. Jamanek; Z. Wieczorek; I. Leszczyńska; W. Skupiński

Published : 2012-04-30

Vol. 57 No. 4 (2012)

Hydrogenation of C=C bonds in styrene-isoprene-styrene block copolymers in the presence of monocyclopentadienyl titanium(IV) catalytic systems

D. Jamanek Z. Wieczorek I. Leszczyńska W. Skupiński

Abstract

Hydrogenation of C=C bonds in styrene-isoprene-styrene (SIS) block copolymers in the presence of CpTiCl2(OC6H4Y-p)/BuLi and CpTiCl2(OC6H4Y-p)/Et3Al catalytic systems (Cp = cyclopentadienyl, Bu = butyl, Et = ethyl; Y = Cl, H, OCH3) was investigated. All of the catalytic systems were active in these reactions. Their activity depended on the kind of the metal alkyl, the copolymer composition, reaction time, temperature and hydrogen pressure. It was established that access of catalytic species to the C=C bonds in the isoprene blocks is the most important factor in the hydrogenation efficiency. The smallest steric hindrances occur when phenoxy ligands in the catalytic systems are unsubstituted (Y = H) and styrene-isoprene diblocks (SI) are present in the SIS copolymer. Thus, the catalytic systems CpTiCl2(OC6H4Cl)/BuLi were the most active in KratonŽ D-1161 copolymers hydrogenation.

Keywords

kopolimer styren-izopren-styren ; cyklopentadienylowe kompleksy tytanu ; uwodornienie ; butylolit ; trietyloglin styrene-isoprene-styrene copolymer ; cyclopentadienyl titanium complexes ; hydrogenation ; buthyllithium ; triethylaluminum

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Jamanek, D., Wieczorek, Z., Leszczyńska, I., & Skupiński, W. (2012). Hydrogenation of C=C bonds in styrene-isoprene-styrene block copolymers in the presence of monocyclopentadienyl titanium(IV) catalytic systems. Polimery, 57(4), 266–270. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/825

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D. Jamanek polimery@ichp.pl

Z. Wieczorek

I. Leszczyńska

W. Skupiński