In-chain functionalized syndiotactic 1,2-polybutadiene by a Ziegler–Natta iron(iii) catalytic system

1,2-Polybutadiene Latices by Catalytic Polymerization in Aqueous Emulsion

Catalytic aqueous polymerization of butadiene by the cobalt catalyst system [Co(C8H13)(C4H6)]/CS2 affords colloidally stable latices of highly crystalline syndiotactic 1,2-polybutadiene (Tm ) 190 °C, ∆Hc ) 60 J/g, Mw ∼ 105 g/mol, 97% 1,2, 3% 1,4-cis). Catalyst modification with reagents containing electrophilic carbon atoms (e.g., aromatic formamides) strongly decreases polymer crystallinity (T...

One-pot synthesis of isotactic-capped syndiotactic polystyrene with a bimetallic homogeneous catalytic system

INTRODUCTION Polystyrene can be obtained in atactic (aPS), isotactic (iPS) or syndiotactic (sPS) form by a variety of catalytic systems1,2 and initiators. For instance, it is known that (pentamethylcyclopentadienyl)titanium derivatives activated by methylaluminoxane (MAO) afford a highly sPS, with %m (defined as meso diads content, calculated by 13C-nuclear magnetic resonance (NMR)) below the i...

A Study on Productivity Model of Supply Chain in Industrial Units by System Dynamic Approach

In this decade, due to the current competitive environment,reputation of industrial brands is markedly dependent upon theperformance of their supply chain. Therefore, it is necessary to examinethe factors affecting their supply chain so as to increase the competitivenessof their chain. Productivity is among the most important factorsin the advancement of industry and its evaluation requires the...

A general route to very small polymer particles with controlled microstructures.

Very small polymer particles of 10-30 nm size with various microstructures (polyethylene, syndiotactic 1,2-polybutadiene, poly(cycloolefins)) are prepared by catalytic polymerization with aqueous catalyst microemulsion.

Chain conformation of polybutadiene blocks in lamellar bidispersed microdomains as revealed by small-angle neutron scattering