Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: P9: Crystallization, Nucleation and Self Assembly
CPP 44.3: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
Direct Observation of Crystallization through Surface Wrinkling in Polymer Thin Film — •Peng Zhang1, Gonzalo Santoro1, Sarathlal K. Vayalil1, Ezzeldin Metwalli2, Peter Müller-Buschbaum2, Tianbai He3, and Stephan V. Roth1 — 1Deutsches Elektronen Synchrotron, Notkestr. 85, 22607 Hamburg, Germany — 2Technische Universität München, Physik-Department, LS E13, James-Franck-Str.1, 85747 Garching, Germany — 3State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Polymer crystallization is a well concerned and yet unclear phase transition from amorphous coils to well organized nanoscale lamellae. Among the research areas of interest are fundamental issues relating to the early stages of polymer crystallization.1,2 Here we explore the structural transition at the early stages of ordering towards crystallization in diblock copolymer thin films. The structure change at early stages of crystallization is unraveled from a perspective of cooling induced density change. The diblock copolymer thin film offers a well confined crystallization case where the density change can be linked with the lateral molecular diffusion. Moreover, the cooling induced surface wrinkling promotes the nucleation and crystal growth in polymer. These findings provide us a new perspective to understand the whole scenario of polymer crystallization. [1] Strobl, G. Eur. Phys. J. E 3, 165 (2000); [2]Cheng, S. Phase Transitions in Polymers: The Role of Metastable States; Elsevier Science: Amsterdam, 2008.