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Example 17-1: Free-Radical Homopolymerization in a CSTRIn this example problem, the built-in polymer CSTR unit US21 is used to model the bulk polymerization of styrene to polystyrene with n-butyl benzoate as the initiator. If solution polymerization is of interest, this problem can be modified easily to add the input component ethylbenzene to the reactor feed for use as a solvent. It is important to note:1. Van Krevelen structural groups (from Appendix A) are given for the polymer polystyrene.
The FILL=VANKREVELEN key-word is used to specify that van Krevelen prediction methods be used for polymer properties.2. Advanced Lattice Model (ALM) binary interaction parameters for the ethyl benzene-polystyrene pair are taken from Table 7-2 and are provided with the ALME and ALMC statements.3. The kinetics type and the molecular weight distribution are pro-vided on the ATTRIBUTE statement. The distribution given will result in the creation of 19 polymer pseudocomponents (1MW500 through 1MW500000).
4. Names are defined for the first three moments of molecular weight distribution (MMWD) on the ATTRIBUTE statement. These moments will be calculated by the US21 unit, but will be printed in the stream report output only if the names are given on this statement.
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