Hillmyer, Marc ADingwell, Claire2024-04-032024-04-032024-04-03https://hdl.handle.net/11299/262056The accompanying dataset contains raw data files for relevant experimental data in the corresponding manuscript. A full description of the data file types, methodological information, and relevant acronyms are described in the accompanying README file. Files are sorted by Analysis Type and Figure/Table. WAXS Data - The raw data is in .xlsx files to be opened in Excel for the 1D spectra. q (inverse angstroms) values vs intensity (a.u.) are given for all three files. SEC data - The raw data is in .xlxs Excel format for each polymer. Data shows retention time (min) vs. RI signal for each sample. Chemdraw data includes a .jpg and a raw Chemdraw file for the paper. All chemdraw figures were drawn in one file for this manuscript. TGA data - The raw data is in .xlsx Excel format. Data shows the time (min) and mass loss (%) in each file. Tensile data - The raw data is shown in .csv files and include instrument data collected for each sample in the complete set. DSC - The raw data is given in .xls files. Each sheet represents the step in the sequence, where ramp steps show the rate of heating or cooling. The time, temperature, and heat flow are given in each column. Barrier Data - Barrier data is given in .pdf files from Clemson University, with data not featured in this paper redacted. An archival version of the raw data is included, .xlsx have been transformed to .csv. POM data was collected, but the videos made are located directly in the supporting information of the paper; data shown in the supporting information document is not given here.This work aimed to decrease the water permeability (PH2O), while simultaneously maintaining low oxygen permeability (PO2) in ethylene vinyl alcohol (EVOH) based copolymers by introducing high levels of backbone regioregularity and stereoregularity. Both regioregular atactic and isotactic EVOH samples with 75 mol% ethylene were prepared by a ring-opening metathesis polymerization (ROMP)-hydrogenation-deprotection approach and then compared to commercial EVOH(44) (containing 44 mol% ethylene) as a low PO2 standard with poor water barrier characteristics (i.e., high PH2O). The high levels of regioregularity and stereoregularity in these copolymers increased melting temperature (Tm), degree of crystallinity (χc), and glass transition temperature (Tg) compared to less regular structures. EVOH(44) demonstrated the highest Tm, but lower χc and Tg values as compared to the ROMP-derived polymers. Wide-angle X-ray scattering showed that semi-crystalline EVOH(44) exhibited a monoclinic structure characteristic of commercial materials, while ROMP-derived polymers displayed an intermediate structure between monoclinic and orthorhombic. Tensile testing showed that isotacticity resulted in brittle mechanical behavior, while the atactic and commercial EVOH(44) samples had higher tensile toughness values. Although EVOH(44) had the lowest PO2 of the samples explored, the atactic and tough ROMP-derived polymer approached this value of PO2 while having a PH2O over 3 times lower than commercial EVOH(44).CC0 1.0 Universalbarrier materialsROMPEVOH copolymersregioregularitystereoregularityDatasethttps://doi.org/10.13020/qhy9-7196