The manner in which the dynamics of a polymer are affected by thin film confinement is of technological significance, impacting thin film applications such as lubricants, adhesives, and chemically amplified photoresists. In this manuscript we use specular X-ray reflectivity (SXR), beam positron annihilation lifetime spectroscopy (PALS), and incoherent neutron scattering (INS) to study the influence of thin film confinement on the apparent glass transition temperature Tg and the thermal expansion coefficients of thin polycarbonate (PC) films. Both the SXR and PALS indicate a significantsuppression of Tg when the film thickness becomes less than 200 Å. However, the INS measurements suggest anincrease in the apparent Tg below this same length scale. These disparate estimates of the thin film Tg seem to indicate that each technique is sensitive to slightly different aspects of the glass formation process. However, all three agree that thin film confinement results inreduced thermal motion, regardless of the precise temperature that is ‘designated’ as the thin film Tg.
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Certain commercial equipment and materials are identified in this paper in order to specify adequately the experimental procedure. In no case does such identification imply recommendation by the National Institute of Standards and Technology nor does it imply the material or equipment identified is necessarily the best available for this purpose
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Soles, C.L., Douglas, J.F., Wu, WL. et al. A Broad Perspective on the Dynamics of Highly Confined Polymer Films. MRS Online Proceedings Library 710, 371 (2001). https://doi.org/10.1557/PROC-710-DD3.7.1