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This program calculates the charges
for the preparation of a polyester resin by condensation
reaction and also from ring-opening of lactones. It also
calculates the average functionality and molecular weight of
the resulting product. It also estimates the weight loss from
the condensation reaction. Polyester or alkyds prepared by
condensation reaction also lose some glycol during the
reaction. An estimated loss of glycol can be entered and the
results will show in the "scaled up weight"
calculation. This program has been written to calculated the
polymer properties with an excess of hydroxyl groups, it will give
erroneous calculations if the carboxyl content exceeds the
hydroxyl level. Condensation reactions do not proceed to 100 %
conversions of functional groups, The conversion level can be
adjusted in the calculation and has a large effect on molecular
weight and functionality. More than 55 polyols and
polycarboxylic acids can be selected. If a diol and acid is
missing from this selection send me a note with the required
data and I will incorporate it.
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Data Input
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Results
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Charge Reactants (polyols and carboxylic acids)
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Charge
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Charge
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Scale up
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Mole
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Mole
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Mole
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Weight
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+ Glycol loss
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Hydroxyl
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Carboxyl
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TOTAL
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Catalyst, %
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Polyester Preparation
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Polyol, glycol loss, %
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Scale up factor
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PROPERTIES OF POLYESTER AT CONVERSION, %
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Error message
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Properties Average Monomer Unit (intermediate information used in
calculation
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Functionality
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Molecular weight
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Unsaturation
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Properties of Polymer
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Acid or Methoxy number in KOH mg/g
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Acid or Methoxy content MEQ/g
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Acid or Methoxy content, Mol per polymer chain
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Degree of Polymerization
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Molecular weight
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Hydroxyl Number, KOH mg/g
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Hydroxyl Equivalent Weight
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Functionality
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Unsaturation per Chain
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Product Scaled up
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Reactant water or methanol and glycol weight loss
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Product yield, weight
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-
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-
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"Scale up"
calculation contains the addition of the estimated loss of glycol in
the reaction, "charge weight " does not.
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