Abstract
For methoxymethylation of nylon-12 films unannealed and annealed at 100°C, the relation between their melting temperature and the substitution ratio of methoxymethyl residue was investigated by DSC. Melting peak temperatures in the 1st-run were a little higher than or nearly equal to that of nylon-12, independent of the substitution ratio. This result means that the methoxymethylation was not effective in suppressing the thickening of crystal or recrystallization by heating. Melting peak temperature in the 2nd-run decreased with increasing substitution ratio. The application of the modified Flory's equation (1) (a=2) to the melting peak temperatures in 2nd-run led the heat of fusion of 17.5_??_19.5 cal/g for the monoclinic (or pseudohexagonal) crystal.
