Monomer addition programs to generate constant gradient block copolymers |
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Authors: | Uwe Beginn |
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Affiliation: | DWI/ITMC-TexMC, RWTH-Aachen, Worringerweg 1, D-52056 Aachen, Germany |
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Abstract: | Equations are derived to calculate the monomer addition programs for semi-batch copolymerization reactions that allow to prepare gradient copolymers and block gradient copolymers containing arbitrary, pre-defined compositional gradients along the polymer chain. An analytical solution is given for the special case of ideal random copolymerizations, and numerical calculations are applied to discuss non-ideal situations. Three classes of addition programs are proposed and discussed with respect to time efficiency. Time-linear addition programs are shown to be insufficient to generate perfectly constant gradients over the whole compositional regions. |
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Keywords: | Gradient copolymers Gradient block copolymers Monomer addition programs |
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