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Temperature-dependent IR-transition moment orientational analysis applied to thin supported films of poly-ε-caprolactone

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Abstract

A novel experimental setup is described which enables one to carry out infrared transition moment orientational analysis (IR-TMOA) depending on temperature. By this, three dimensional molecular order parameter tensors of IR-active transition dipole moments with respect to the sample coordinate system can be determined in their thermal evolution (35 °C < T < 59 °C). As an example crystallinity and macroscopic order of poly-ε-caprolcatone are monitored. Both remain largely unaltered up to T ∼ 50 °C, above which they decrease. These reductions are explained as the melting of flat-on crystalline lamellae that make up about 34% of the crystalline material. The remaining crystallites are arranged into bulk-like, confined spherulitic structures and do not melt by more than (3 ± 3)%. Therefore, flat-on oriented lamellae are supposed to be kinetically favored by confinement during melt crystallization but are thermodynamically less stable than two-dimensionally confined bulk-like spherulites.

Graphical abstract: Temperature-dependent IR-transition moment orientational analysis applied to thin supported films of poly-ε-caprolactone

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Publication details

The article was received on 05 Oct 2017, accepted on 16 Nov 2017 and first published on 30 Nov 2017


Article type: Paper
DOI: 10.1039/C7SM01988B
Citation: Soft Matter, 2017, Advance Article
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    Temperature-dependent IR-transition moment orientational analysis applied to thin supported films of poly-ε-caprolactone

    W. Kossack, M. Schulz, T. Thurn-Albrecht, J. Reinmuth, V. Skokow and F. Kremer, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM01988B

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