尼龙1010结晶与熔融行为的研究

用DSC研究了降温速率R对尼龙10 10结晶与熔融的影响,以及室温(RT)和液氮(LN)骤冷退火样品的熔融.降温时结晶温度随R增大线性降低;T_g以上可完成结晶时结晶度相同;结晶起始温度>181℃生成的晶体有三个熔融峰,对应于环状和放射状球晶的转化与熔融;在181℃和T_g间结晶,无放射球晶转化峰;T_g下有结晶放热峰样品加热时有冷结晶发生.RT未退火样品三个熔融峰,退火温度T_α≥180℃样品两个峰,结晶度C∝T_a;LN未退火样品单一熔融峰,T_a>160℃双峰,T_a≤160℃三峰,低温峰温与C均∝T.

CRYSTALLIZING AND MELTING BEHAVIOURS OF NYLON 1010

The effects of cooling rate (R) with crystallizing and melting behaviours of nylon 1010 and the melting of its samples which were quenched from melt at room temperature(RT) and liquid N2 (LN) and then annealed have been studied by DSC. The crystalzing temperatures are linearly decreased with R increasingr. If the crystallizations are finished above T9, the cry-stallinities (C) are the same. When the initial temperature of crystallization >181℃, the crystal produced have 3 melting peaks which are about the transformation and melting of ringed and nonringed spherulites. The crystal formed within 181℃ to Tg is without the melting peak of nonringed spherulites. Heating the samples formed below Tg, there is a process of cold crystallization before the melting. RT sample without annealing produces 3 melting peaks. When the annealing temperature Taα180℃, the samples have 2 peaks and C∝Tα LN sample without annealing has only 1 melting peak. When Ta>160℃, the annealed samples have 2 peaks. Tα≤160℃, there are 3 peaks. The lowest peak temperatures and C are both proportinal to Ta.