ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
A stepwise scheme, reported recently for the calculation of molecular weight distributions in AB monomolecular condensation polymers under the condition of unequal reactivity, has been applied to the more common AA, BB bimolecular condensation polymers. In the scheme a condensation polymerization is arbitrarily subdivided into a number of steps. The polymer obtained in one step is treated as the monomer for the next step. In each of the steps, Flory's distribution for condensation polymer under equal reactivity is used as the molecular weight distribution for that step. Reactivity variances are incorporated into the calculation through the application of weighing factors on the concentrations of the reacting molecules in each of the steps. In the bimolecular case, three types of monomers, AA, BB, and AB, must be considered for the intermediate polymerization steps. The required distribution of this trimolecular condensation under equal reactivity conditions is not available and has to be derived. As expected, the application of the scheme to bimolecular condensation is more complex but numerical calculations using the scheme should still be manageable on a desktop computer with suitable memory capacity. © 1993 John Wiley & Sons, Inc.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1993.070500302
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