Solid-state NMR data from: Polyolefin blends with co-continuous architectures enabled by dynamic covalent crosslinking
Data files
Jun 25, 2026 version files 19.16 MB
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README.md
2.54 KB
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SSNMRdata_Polyoelefin.zip
19.16 MB
Abstract
Blending polymers produces brittle materials due to macrophase separation and poor interfacial adhesion, which is exemplified by mixtures of polyolefins. This presents a formidable challenge for the mechanical recycling of mixed plastic waste. Here, we demonstrate that dynamic covalent crosslinking of immiscible polyolefin blends creates macrophase-separated co-continuous architectures, yet they display excellent mechanical properties, which challenges the conventional wisdom regarding morphology-property relationships in polymer blend compatibilization. We find that the position and orientation of dynamic crosslinks and their influence on crystallinity are key to understanding the structure-morphology-property relationships. In particular, high-resolution microscopy imaging reveals alignment of crystallite planes with strong orientational preference, particularly at polymer-polymer interfaces, which contribute to material performance. We further demonstrate that changes in crosslinker density and valency allow the properties of binary and ternary polyolefin blends to be tuned in a modular fashion.
Description of the data and file structure
This study demonstrates that dynamic covalent crosslinking in polyolefin blends can address the mechanical challenge often encountered when blending polymers. Various characterization techniques elucidate the molecular interactions underlying this behavior, and solid-state NMR data in this dataset further support these findings.
This dataset relates to the publication in Science Reports (Eliza K. Neidhart et al., Polyolefin blends with co-continuous architectures enabled by dynamic covalent crosslinking. Sci. Adv. 12, eaee2328 (2026). DOI:10.1126/sciadv.aee2328).
It includes solid-state NMR measurements that characterize the proton environments and their relaxation behaviors in crosslinked polyolefin blends derived from HDPE–iPP systems. Three samples are included:
UB: the unmodified HDPE-iPP blend
NB: the non-crosslinked blend
B1: the dynamically crosslinked blend
Detailed sample compositions and preparation procedures are described in the associated publication.
Files and variables
File: SSNMRdata_Polyoelefin.zip
The description:
All datasets are provided as raw Bruker NMR data files. The data can be visualized and processed using Bruker TopSpin by loading the extracted experiment folders into the software. Alternatively, the data can also be imported into MestReNova (Mnova) software (using the fid files in the corresponding subfolders) or the Dmfit program (using the 1r files located in the corresponding subfolders). Acquisition parameters are included within each Bruker dataset and can be accessed through Topspin.
The pseudo-2D "1H shift" contains solid-state 1H NMR spectra showing the proton environments of each sample. These spectra display 1H chemical shift (ppm) on the x-axis and signal intensity (arbitrary units) on the y-axis.
The subfolder "T1rho" contains 1H T₁ρ relaxation measurements for each sample. These datasets consist of pseudo-2D spectra acquired at multiple spin-lock durations, where the signal decay as a function of spin-lock time is used to determine T₁ρ relaxation behavior. The folder "B1_longer" contains an additional measurement of the same B1 sample acquired with extended signal averaging (longer acquisition time) to improve signal-to-noise ratio, collected under a higher spin-lock field strength.