CRYSTALLIZATION AND MELTING OF NYLON 610

• 来源期刊: 高分子科学（英文版）
• 学科: 化学
• 年，卷（期）: 1998,（3）
• 页码范围: 241-252
• 页数: 12页
• 分类号: O6
• 语种: 英文

摘要

Differential scanning calorimetry was used to study the crystallization and melting of nylon 610. For nylon 610 crystallized from the melt state (260℃), the overall rate of bulk crystallization can be described by a simple Avrami equation with Avrami exponent n≈2, independent of crystallization temperature. With the experimentally obtained Tm0 (235℃～255℃) of nylon 610, the fold surface free energy σe was determined to be 35～38 erg/cm2. The effects of annealing temperature and time on the melting of quenched nylon 610 were also investigated. 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. 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. The existence of the third melting peak suggests that more than one kind of distribution of lamella thickness may occur when quenched nylon610 is annealed. The implications of these results in terms of crystal thickening mechanism were discussed.