Effect of annealing on thermal behaviour and crystalline structure of meltcrystallized nylon 6 has been investigated. The annealing process is found to be characterized by an incubation period followed by a more or less doubling of the SAXS" long spacing and of the crystallinity. The extrapolated heat of melting of the crystalline phase of nylon 6 in the a-modification is 188 jg-1 and its extrapolated equilibrium melting temperature is 260 ~
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