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利用自晶种方法,在邻二氯苯稀溶液中培养聚丁二酸丁二醇酯(PBS)晶体,系统研究了结晶温度对其晶体形貌的影响.使用PBS单晶作为研究对象,有效避免小尺寸观察不具有统计意义的缺点.在结晶过程中,通过改变结晶温度和自晶种温度,可有效调控稀溶液中生长的PBS晶体尺寸大小和晶体中缺陷的数量,得到了单层无缺陷的单晶、双层晶体和多层晶体等一系列PBS片晶.基于对不同实验条件下得到片晶的形貌和表面粗糙度的统计结果,提出晶体中可容忍的缺陷数量与结晶温度和晶种温度密切相关这一结论,通过建立热力学模型,定性分析了晶体中缺陷数量和结晶温度的依赖关系,从片晶表面粗糙度统计结果出发,提出高分子片晶折叠表面成核机制,较好地解释了实验中观察到的不同PBS晶体的形貌.
The crystallization of polybutylene succinate (PBS) crystals was studied in a dilute solution of o-dichlorobenzene by self-crystallization method, and the effect of crystallization temperature on the crystal morphology was studied systematically. Avoid the shortcoming of small size observation is not statistically significant in the crystallization process, by changing the crystallization temperature and temperature from the seed crystals can effectively control the growth of dilute solution PBS crystal size and the number of defects in the crystal to obtain a single layer without A series of defects such as single crystal, double crystal and multilayered crystals were obtained.According to the statistical results of the morphology and surface roughness of the lamella obtained under different experimental conditions, the number of defects tolerable in the crystal and the crystallization temperature According to the conclusion that there is a close correlation between the seed crystal temperature and crystal temperature, the thermodynamic model is established to qualitatively analyze the dependence of the number of crystal defects on the crystal temperature. Based on the statistical results of surface roughness, The morphology of the different PBS crystals observed in the experiment is well explained.