PAN En-li, HU Jing-yu, ZHOU Chang-yu. KINETIC STUDY ON THE POLYMERIZATION OF BUTADIENE WITH LnCl3-C2H5OH-AlR3 CATALYSTS Ⅰ. Determination of the Propagation Rate Constants[J]. Acta Polymerica Sinica, 1985,(2):125-130.
PAN En-li, HU Jing-yu, ZHOU Chang-yu. KINETIC STUDY ON THE POLYMERIZATION OF BUTADIENE WITH LnCl3-C2H5OH-AlR3 CATALYSTS Ⅰ. Determination of the Propagation Rate Constants[J]. Acta Polymerica Sinica, 1985,(2):125-130.DOI:
The propagation rate constants and active center concentration were evaluated for the polymerization of butadiene with LnCl3-C2H5OH-AlR3 catalysts(Ln=La
Nd
Sm
Gd
Dy
Ho or Y; AlR3=Al (C2H5)3 or Al(i-C4H9)3. Both the propagation rate constant and active center concentration varied with the rare earth element used in the catalyst. The former lies in the range of 6-100 l/mol · sec at 30℃ and decreases in the order of: kp(Nd)-Kp (Sm)-Kp(Gd) > Kp (La) > Kp (Dy) > Kp (Ho) > Kp(Y). The active center concentration formed by Nd-catalyst has an order of 2—3×10-2mol/mol Nd which is much higher than any other six rare earth catalysts. The nature of propagation rate constant was discussed.