Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Polymerization of complexes with Lewis acids

Molecular orbital calculations support this. Polymerizations can also be carried out with less than stoichiometric ratios of the Lewis acids to the monomers. As an illustration, coupling of an acrylic or a methacrylic monomer with a Lewis acid can be shown as follows  [Pg.67]

The increased reactivity toward polymerization by some monomers, even in the presence of less than equimolar amounts of Lewis acids, was suggested to be due to one of two possibilities. It may be due to greater reactivity of the portion of the monomer that complexes toward the growing chain end. It may also be due to formation of new complexes between an uncomplexed monomer and a complexed one [Pg.67]

The picture is more complicated when the Lewis acids are used in combinations with donor-acceptor monomers. The donor-acceptor complexes are believed to form first and then react with Lewis acids according to the following scheme  [Pg.67]

A structure of methyl methacrylate and styrene complexed with SnCU was shown to be as follows  [Pg.67]

In formations of ternary complexes, the acceptor vinyl compound must have a double bond conjugated to a cyano or to a carbonyl group. Such acceptors are acrylonitrile, methacrylonitrile, acrylic and methacrylic esters and acids, methyl vinyl ketone, acrylamide, etc. Donor monomers are styrene, a-methyl styrene, butadiene, 2-3-dimethyl butadiene, isoprene, chloroprene, etc. [Pg.67]


See other pages where Polymerization of complexes with Lewis acids is mentioned: [Pg.67]    [Pg.111]    [Pg.111]   
See also in sourсe #XX -- [ Pg.67 ]

See also in sourсe #XX -- [ Pg.111 , Pg.112 ]




SEARCH



Complexes polymeric

Lewis acid complexation

Lewis acid complexes

Lewis acids, polymeric

Lewis complexed

Polymerization, with

With Lewis Acids

© 2024 chempedia.info