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3. Characteristics of gel-type substrates
3.1 Functionalization rate
An important parameter is loading. It determines the number of functionalized benzene nuclei relative to the total number of aromatic nuclei in the polymer. For example, in the case of Merrifield resins (figure 6 ), this parameter is expressed by the percentage of chlorine by mass (% Cl) or by the number of milliequivalents of chlorine per gram of resin (n Cl ). The correspondence between these different units is shown in table 1 .
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Characteristics of gel-type substrates
Functionalization of solid support
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