Poly(butylene succinate) (PBSu) and poly(ethylene adipate) (PEA), isomeric to each other, are mixed in a miscible state, and PBSu crystallized at T_c’s where PEA is kept at a molten state. PBSu upon crystallization in the presence of isomeric PEA at various T_c’s develops sector-face spherulitic patterns, which are shown to originate from a common nuclei center. The two faces of sector-face PBSu spherulites are more strikingly contrast when PBSu is highly diluted by isomeric PEA in PBSu/PEA mixtures (PEA = 70–80%) and crystallized at intermediate T_c = 50–60 °C. The main characteristics of crystallized PBSu and lamellar assembly mechanisms in these two faces were investigated using POM, SEM, AFM, and DSC. For both faces (ring-banded vs dendritic) of the sector-face PBSu spherulites, the lamellar assembly mechanism differs, but the growth is similar by repeating with periodic multiplication of fractal branches (whose number is proportional to square of radius) in the next cycle; thus, the lamellae fractal branches not only able to interpret the periodic optical banding but also account for filling the expanding spherulite. This growth mechanism is readily accounted by many fractal patterns in the nature.

中文翻译：

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用异构体聚合物结晶的聚丁二酸丁二醇酯中不寻常的环状/树枝状表面

彼此异构的聚丁二酸丁二酯（PBSu）和聚己二酸乙二醇酯（PEA）以可混溶状态混合，PBSu在PE保持熔融状态的T _c处结晶。在各种T _c处存在异构PEA的情况下，结晶后的PBSu会形成扇形面的球状图案，显示其起源于共同的核中心。当PBSu被同分PEA在PBSu / PEA混合物（PEA = 70–80％）中高度稀释并在中间温度T _c结晶时，扇形面PBSu球晶的两个面的反差更大。= 50–60°C。使用POM，SEM，AFM和DSC研究了这两个面上结晶的PBSu和层状组装机制的主要特征。对于扇形面PBSu球晶的两个面（环带状或树枝状），层状组装机制均不同，但在下一个中重复分形分支（其数目与半径的平方成正比）进行周期性乘法，从而使生长类似周期; 因此，片状分形分支不仅能够解释周期性的光学带，而且能够解释膨胀球晶的填充。这种生长机制很容易被自然界中的许多分形图案所解释。