Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/7561
Title: Suppression of Poly(ethylene oxide) Crystallization in Diblock Copolymers of Poly(ethylene oxide)-b-poly(epsilon-caprolactone) Confined to Nanoporous Alumina
Authors: Suzuki, Yasuhito
Duran, Hatice
Steinhart, Martin
Butt, Hans-Jurgen
Floudas, George
Keywords: [No Keywords]
Issue Date: 2014
Publisher: Amer Chemical Soc
Abstract: The kinetics of crystallization (heterogeneous vs homogeneous nucleation) and the relation to the local segmental dynamics are studied in a series of poly(ethylene oxide)-b-poly(epsilon-caprolactone) (PEO-b-PCL) diblock copolymers confined within self-ordered nanoporous alumina (AAO) by X-ray scattering, polarizing optical microscopy, differential scanning calorimetry and dielectric spectroscopy. In the bulk and for the more asymmetric copolymer, the minority phase (PEO) nucleates solely via homogeneous nucleation. When the same diblock copolymers reside inside AAO, nucleation of PEO is completely suppressed. The majority block (PCL) is also affected by confinement and crystallizes at lower temperatures via homogeneous nucleation. These findings can be discussed in terms of the proposed temperature vs curvature "phase diagram". In this diagram the melt and glassy states are separated by the two nucleation regimes, heterogeneous and homogeneous at high and low temperatures, respectively. Homogeneous nucleation is controlled by the faster part of the distribution of PCL segmental relaxation which under confinement speeds-up.
URI: https://doi.org/10.1021/ma4026477
https://hdl.handle.net/20.500.11851/7561
ISSN: 0024-9297
1520-5835
Appears in Collections:Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü / Department of Material Science & Nanotechnology Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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