A series of porphyrin metal(III) compounds of general formula LMX (where L = tetraphenylporphyrin, tetrakispentafluorophenylporphyrin and octaethylporphyrin, M = Al, Cr, Co, and X = Cl and OEt) has been synthesized and studied as catalysts for the ring opening polymerization of propylene oxide (PO) as well as copolymerization of PO with CO2 to produce polypropylene oxide (PPO), polypropylene ca...

Hierarchically porous silica monoliths with well-defined interconnected macropores and uniform spherical mesopores were spontaneously prepared by combining polymerization-induced phase separation with an epoxide-mediated sol-gel route without any complicated aging and drying and high-temperature heat treatment. The precise control of pore structures can be realized by using propylene oxide (PO)...

Copolymerization of racemic alpha-olefins with ethylene and propylene was carried out in the presence of enantiopure C1-symmetric ansa metallocene, {1,2-(SiMe2)2(eta5-C5H-3,5-(CHMe2)2)(eta5-C5H3)}ZrCl2 to probe the effect of the polymer chain end on enantioselection for the R- or S-alpha-olefin during the kinetic resolution by polymerization catalysis. Copolymerizations with ethylene revealed t...

Copolymerization of racemic -olefins with ethylene and propylene was carried out in the presence of enantiopure C1-symmetric ansa metallocene, {1,2-(SiMe2)2( -C5H-3,5-(CHMe2)2)( -C5H3)}ZrCl2 to probe the effect of the polymer chain end on enantioselection for the Ror S-olefin during the kinetic resolution by polymerization catalysis. Copolymerizations with ethylene revealed that the polymer cha...

Reaction of the ligand 2,4-tert-butyl-6-[(2-methylquinolin-8-ylimino)methyl]phenol (L(1)H) with [VOCl3] in the presence of triethylamine afforded the complex [VOCl2L(1)] (1), whereas use of [VO(OnPr)3] led to the isolation of [VO2L(1)] (2) or [VO2L(1)]·2/3MeCN (2·2/3MeCN). Reaction of 2-((2-(1H-benzo[d]imidazol-2-yl)quinolin-8-ylimino)methyl)-4,6-R(1),R(2)-phenols (R(1) = R(2) = (t)Bu; L(2)H), ...

In propylene (C3) polymerization with Ziegler-Natta catalyst, not only internal donor but also external is very important to make isotactic polypropylene (PP) higher yield. Most propylene-based polymers have been commercially produced catalysts combined dialkyl-dialkoxy silane compounds (R2Si(OR)2) such as C-donor, P-donor, and D-donor donors. this paper, we will introduce the performance amino...

ABSTRACT: The effect of adding diethyl zinc as a chain transfer agent during the polymerization propylene in heptane performed at 80 °C was studied. Although it expected that the transfer would stop after precipitation polymer, the polymer molecular weight continued to increase throughout the whole polymerization. presence had an additional that polymerizations were devoid reactor fouling. To u...