anionic polymerization

anionic polymerization

[¦a‚nī¦än·ik pə‚lim·ə·rə′zā·shən]
(organic chemistry)
A type of polymerization in which Lewis bases, such as alkali metals and metallic alkyls, act as catalysts.
References in periodicals archive ?
Cast polyamide moldings are based on alkaline rapid polymerization in a mold involving anionic polymerization of lactams.
The use of anionic polymerization allowed the molecular weight of the polymer to be easily adjusted by altering the initiator and the molar ratio of the monomers.
Table 1--comparison of IR polymerization process Emulsification process Cis-1,4 density Biosynthesis in trees (NRL) >99% Coordination polymerization ~96% (Ziegler-Natta) Anionic polymerization ~90% Table 2--IR latex compounds, dry phr Ingredient IR1 IR2 IR3 Kraton IR-401 polymer 100.
Subsequent chapters offer detailed coverage of methods and recent advances in cobalt-mediated radical polymerization, and anionic polymerization, alkyne metathesis polymerization ADIMET and macrocyclization, for example.
Utilizing the route of anionic polymerization makes possible to prepare amino functional-terminated polysiloxane chains because the basic conditions will not affect the amine functionality.
Called Rotomolded Anionic Polymerization, or RAP, the process is claimed to offer cost savings relative to using standard nylon 6 resin.
The new facility features an analytical services instrument room and a polymer laboratory, adding anionic polymerization technology to Sartomer's list of capabilities.
The new facility features a state-of-the-art analytical services instrument room and a polymer laboratory, adding anionic polymerization technology to Sartomer's extensive list of capabilities.
We are currently adapting bench-top anionic polymerization methods to prepare such reactive star-shaped polymers.
It is used in organic synthesis and as initiator for the anionic polymerization of synthetic rubber.
Butadiene rubber (BR), one of the most well-known synthetic elastomers, is normally utilized for tires (tire treads and side walls), thermoplastic elastomers (high impact polystyrene [HIPS] and acrylonitrile-butadiene-styrene terpolymer [ABS]), and technical rubber goods (golf ball cores, conveyer belts, shoe soles, and seals) [1], BR is typically classified according to the polymerization technology and initiator/catalyst as three types: radical polymerization in an aqueous emulsion (E-BR), anionic polymerization in solution using Li-catalysts (Li-BR), and coordinative polymerization in solution using Co, Ni, and Nd-based Ziegler-Natta catalysts (Co-BR, Ni-BR, and Nd-BR, respectively) [1].
The material presents both conceptual information as well as specific information for engineers and researchers, and covers such topics as theoretical considerations for self healing materials and concept modeling, extrinsic self-healing via addition polymerization, anionic polymerization, and intrinsic self-healing using the Diels-Alser Reaction.