Instantaneous sequence length distribution

The instantaneous sequence length distribution, defined as the probability of having a sequence of k monomers in a row of type A, followed by a monomer B can be determined from ACOMP measurements at each point/[22, 23]. 

Composition Drift and Sequence Length Distributions Automatic continuous online monitoring of polymerization continuous measurements of comonomer concentrations can be used to compute the average instantaneous molar fraction of a comonomer A in the copolymer chain formed at any given moment F based on ... 

V. Copolvmerization Kinetics. Qassical copolymerization kinetics commonly provides equations for instantaneous property distributions (e.g. sequence length) and sometimes for accumulated instantaneous (i.e. for high conversion samples) as well (e.g. copolymer composition). These can serve as the basis upon whkh to derive nations which would reflect detector response for a GPC separation based upon properties other than molecular weight. The distributions can then serve as c bration standards analagous to the use of molecular weight standards. 

It should be noted that the copolymer equation (7.11) describes the instantaneous copolymer composition on a macroscopic scale, that is, composition in terms of the overall mole ratio or mole fraction of monomer units in the copolymer sample produced, but it does not reveal its microstructure, that is, the manner in which the monomer units are distributed along the copolymer chain. Thus for two monomers Mi and M2, the ratio Fi/(I — F ) gives the overall mole ratio of Mi and M2 units in the copolymer but no information about the average lengths (i.e., number of monomer units) of Mi and M2 sequences, as illustrated (Allcock and Lampe, 1990) for a typical copolymer by... 

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