Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 20: POSTER A
CPP 20.19: Poster
Montag, 24. März 2003, 19:00–21:00, ZEU/250
Domain structure and crystallization in a blend of a PE-PEO diblock copolymer and an epoxy resin — •Rosina Staneva1, Qipeng Guo2, Wolfram Gronski3, Rouja Ivanova1, and Bernd Stühn1 — 1Ilmenau Technical Univ., Polymer Physics, D-98693 Ilmenau, Germany — 2University of Queensland, Brisbane, QLD 4072, Australia — 3University of Freiburg, Inst. Macromol. Chem., D-79104 Freiburg, Germany
A series of blends of a PE-PEO diblock copolymer (M=1400) with a bisphenol A-type expoxy resin (ER) is studied in the full range of composition. Curing of the mixture was done at T=110∘ C. DSC shows well separated melting peaks for both blocks of the copolymer. The ER rich samples only show the melting of the PE domains. The structure of the copolymer is investigated with SAXS. It shows a lamellar microphase separated structure at room temperature and disorder at high T.
In the blends a sequence of structures is found with decreasing fraction of the copolymer. The ER is swelling the PEO domains thus increasing the lamellar period. Heterogeneous structures are found at intermediate compositions. Samples with small fraction of copolymer are characterized as micellar structures. Several models are applied to describe the SAXS results. The lamellar as well as the micellar structures are quantitatively described. The intermediate range is heterogeneous displaying structure on an hierarchy of length scales.