Crystallinity and perfection in ethylene vitrimers probed by combined calorimetry, scattering, and time-domain NMR

<p>This Dataset comprises&nbsp;the raw data contained in the figures of our journal article in&nbsp;<em>Frontiers in Soft Matter </em>(DOI: 10.3389/frsfm.2023.1208777)<em>. </em>We provide a preprint of the article for reference to the figures and their captions, necessary to use the data. For copyright details and licensing we refer to the original article and the publisher. Here is the abstract of the article:</p> <p>The kinetics of crystallization and crystal-crystal transformations in ethylene vitrimers are studied by time-domain NMR. These vitrimers previously exhibited polymorphic transition of crystal structures, which are shown here to be distinguishable by NMR via their dipolar line widths based upon different proton densities and fast internal motions. The conditions under which the polymorphs are formed and interconvert are identified via time-resolved NMR experiments, with a focus on recrystallization after full and partial melting. DSC experiments are used to clarify an unexpected superheating effect, which challenges the determination of actual melting points. We further identify a strong memory effect in isothermal (re)crystallization. Implications of the dynamic nature of the vitrimers in relation to the kinetics of crystallization are discussed. We find that internal perfecting of crystals, enabled by the vitrimeric exchange process, can have a large effect on the DSC-detected melting enthalpy without change in overall crystallinity.</p>