Journal
SOFT MATTER
Volume 13, Issue 48, Pages 9211-9219Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sm01988b
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Funding
- German Science Foundation [SFB TRR 102]
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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 degrees C < T < 59 degrees C). As an example crystallinity and macroscopic order of poly-epsilon-caprolcatone are monitored. Both remain largely unaltered up to T similar to 50 degrees 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.
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