Differential scanning calorimetry was used to study the crystallization andmelting of nylon 610.9w0Transparent nylon-Transparent nylon_PA610_PA612_PA1010_PA121

For nylon 610 crystallized from the melt state (260℃), the overall rateof bulk crystallization can be described by a simple Avrami equation with Avrami exponentn ≈ 2, independent of crystallization temperature.9w0Transparent nylon-Transparent nylon_PA610_PA612_PA1010_PA121

With the experimentally obtainedTm0 (235℃ ～ 255℃) of nylon 610, the fold surface free energy σe was determined to be35 ～38 erg/cm2.The effects of annealing temperature and time on the melting of quenched nylon 610 were also investigated.9w0Transparent nylon-Transparent nylon_PA610_PA612_PA1010_PA121

For nylon 610 quenched at room temperature there is only one DSC endotherm peak DSC scans on annealed samples exhibited an endotherm peak at approximately 10℃ above the annealing temperature.9w0Transparent nylon-Transparent nylon_PA610_PA612_PA1010_PA121

The size and position of the endothermic peak is strongly related to annealing temperature and time.An additional third melting was observed when quenched nylon 610 was annealed at high temperature for a sufficiently long residence time.9w0Transparent nylon-Transparent nylon_PA610_PA612_PA1010_PA121

The existence of the third melting peak suggests that more than one kind of distribution of lamella thickness may occur when quenched nylon 610 is annealed.The implications of these results in terms of crystal thickening mechanism were discussed.9w0Transparent nylon-Transparent nylon_PA610_PA612_PA1010_PA121