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Kinetics of step-growth polymerizations

ADMET has been shown to be a step-growth polycondensation reaction [31[. The kinetics of step-growth polymerization and consequences thereof are completely different than those of chain polymerizations. Since ROMP and many other single-site transition metal-catalyzed polymerizations discussed in this book proceed... [Pg.195]

If a volatile monomer is used in an ADMET polymerization, a condenser should be used to return monomer vapor to the reaction mixture. The kinetics of step-growth polymerization dictate that the concentration of monomer falls very quickly to produce dimer, trimer, and so forth. Nevertheless, monomer will be present for some time after the start of the polymerization. If the monomer is particularly volatile, a dry ice-isopropanol condenser is useful. This can be constructed in any glass shop by attaching a cup-shaped cooling reservoir to a vacuum valve or other cylindrical glass tube with the required joints and valve. If the monomer is only slightly volatile, or the carrier gas method is used, a water-cooled condenser is sufficient to retain monomer in the flask, while allowing ethylene to escape. [Pg.225]

The kinetics of step-growth polymerization can be derived from a polyesterification reaction that follows the same course as all acid-catalyzed esterifications. ... [Pg.280]

Mechanism and Kinetics of Step-Growth Polymerization and, the molecular weight distribution is ... [Pg.409]

A-A/B-B Step Growth If the two functional groups are on different monomer units, the kinetics of step-growth polymerization are more complex. If two monomers are used, one with two A functional groups and one with two B functional groups, the polymerization is described as A-A/B-B step-growth polymerization. An example is nylon 66. The polymerization may be represented as ... [Pg.340]

The rate of a step-growth polymerization is the sum of the rates of reactions which take place between molecules of different size, therefore, in this case the kinetics is difficult to analyze. However, the kinetics of step-growth polymerization can be considered identical to those of analogous small molecule reaction and can be... [Pg.8]

See other pages where Kinetics of step-growth polymerizations is mentioned: [Pg.282]    [Pg.283]    [Pg.285]    [Pg.287]    [Pg.289]    [Pg.291]    [Pg.87]    [Pg.93]    [Pg.93]    [Pg.95]    [Pg.196]    [Pg.279]    [Pg.279]    [Pg.403]    [Pg.405]    [Pg.407]    [Pg.411]    [Pg.69]    [Pg.69]    [Pg.7]    [Pg.232]    [Pg.15]   
See also in sourсe #XX -- [ Pg.403 , Pg.404 , Pg.405 , Pg.406 , Pg.407 , Pg.408 , Pg.409 , Pg.410 , Pg.411 ]



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