Morphology Diagram of Single-Layer Crystal Patterns in Supercooled Poly(ethylene oxide) Ultrathin Films: Understanding Macromolecular Effect of Crystal Pattern Formation and Selection

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• 作者：Guoliang Zhang ; Xuemei Zhai ; Zhenpeng Ma ; Liuxin Jin ; Ping Zheng ; Wei Wang ; Stephen Z. D. Cheng ; Bernard Lotz
• 刊名：ACS Macro Letters
• 出版年：2012
• 出版时间：January 17, 2012
• 年：2012
• 卷：1
• 期：1
• 页码：217-221
• 全文大小：373K
• 年卷期：v.1,no.1(January 17, 2012)
• ISSN：2161-1653

文摘

A series of single-layer crystal patterns were observed in ultrathin films of 10 poly(ethylene oxide) fractions of molecular weights ranging from 2.02k to 932.0k g/mol. Morphology transitions between these different crystal patterns were quantitatively identified, and a morphology diagram with respect to supercooling and molecular weight dependencies was constructed. This will foster understanding of the macromolecular effects on the crystal pattern formation and selection critically associated with the parameters of molecular diffusion length and growth anisotropy.