S. Bhattacharjee et al., SELECTIVE HYDROGENATION OF OLEFINIC BONDS IN STYRENE-ISOPRENE STYRENETRIBLOCK COPOLYMER BY PALLADIUM ACETATE CATALYST, Journal of applied polymer science, 49(11), 1993, pp. 1971-1977
Homogeneous catalytic hydrogenation of styrene-isoprene styrene triblo
ck copolymer (SIS) has been carried out selectively at the carbon-carb
on double bond in the presence of palladium acetate catalyst under mil
d conditions. Degree of hydrogenation has been calculated with the hel
p of infrared and nuclear magnetic resonance spectroscopic techniques.
Almost 90 mol % complete hydrogenation has been achieved at 60-degree
s-C under 1.4 MPa hydrogen pressure, 40 mg catalyst (for 2 g of polyme
r) in chloroform-acetone solution for 1 h. (C) 1993 John Wiley & Sons,
Inc.