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采用差示扫描量热法和X射线衍射法对低熔点聚酰胺的结晶和熔融行为进行研究,考察了共聚单体、等温结晶温度和时间对样品结晶和熔融行为的影响。结果表明:经等温结晶后的样品再次升温时,均出现了双熔融峰,且随等温结晶温度的升高或时间的延长,低温熔融峰向高温方向移动,而高温熔融峰则基本不变。等温结晶温度80℃时,两种样品的熔融焓值均较大,并且随结晶时间的延长会变大。X射线衍射结果表明:随着结晶温度的升高或时间的延长,衍射峰变得尖锐,样品的结晶度增大。添加了十二烷基二胺的切片B比添加癸二胺的切片A具有更好的结晶能力,比较适合纺丝加工。
The crystallization and melting behavior of low melting polyamides were investigated by differential scanning calorimetry and X-ray diffraction. The effects of comonomer, isothermal crystallization temperature and time on the crystallization and melting behavior of the samples were investigated. The results show that when the sample is isothermally heated again, the double melting peak appears. With the increase of the isothermal crystallization temperature or the extension of time, the melting peak of the low temperature moves to the high temperature, while the melting peak of the high temperature does not change substantially. When the isothermal crystallization temperature is 80 ℃, the enthalpy of fusion of the two samples is large, and becomes larger as the crystallization time prolongs. X-ray diffraction results show that as the crystallization temperature increases or the time prolongs, the diffraction peak becomes sharp and the crystallinity of the sample increases. Slice B with dodecyl diamine added had better crystallization ability than slicer A with decamethylenediamine added, which was more suitable for spinning process.