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Since the conversion level was kept low for these runs, it can be assumed that the composition drift is negligible. In order for copolymer composition drift to be negligible (that is, for the initial feed composition to remain unchanged and for the (measurable) cumulative copolymer composition to be equal to its instantaneous value), experimental data must be collected at very low conversion levels.
This restrictive assumption introduces additional sources of error, including significant experimental difficulties. As an alternative, a cumulative ternary composition model has been considered in order to estimate ternary reactivity ratios using the full conversion trajectory.