4. Solid-phase postcondensation (PCS or SSP)
4.1 Kinetic aspect
Melt-phase polycondensation does not allow access to very high molecular weights, in particular, as we saw previously 1 , to those required by certain applications (industrial yarns and bottles). Indeed, at these temperatures, close to 270 ˚C, competition between polycondensation reactions and undesirable secondary reactions...
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Solid-phase postcondensation (PCS or SSP)
DuPont process (NG3)
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