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The crystallization of polymers has been one of the major topics in polymer physics. Spherulites are common crystalline structures observed in semi-crystalline polymers. Many studies[1-5] have been performed to investigate the detailed structures and formation mechanisms. It is generally accepted that the three-dimensional geometry of spherulites develops from a stack of lamellae. During the growth process, the stacked lamellae splay apart continually and branch occasionally[6.7]. However, there are many unanswered questions. For example, what is a pri-
The crystallization of polymers has been one of the major topics in polymer physics. Spherulites are common crystalline structures observed in semi-crystalline polymers. Many studies [1-5] have been performed to investigate the detailed structures and formation mechanisms. that the three-dimensional geometry of spherulites develops from a stack of lamellae. During the growth process, the stacked lamellae splay apart continually and branch occasionally [6.7]. However, there are many unanswered questions. For example, what is a pri-