ArticleACS omega2026
Supramolecular Structural Variations in iPP/ZnO Nanocomposites: Effect on Optical and Dielectric Performance.
Article in ACS omega, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
7 authors.
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Abstract
This study investigates the impact of melt-cooling rate on the structural, optical, and electrical properties of isotactic polypropylene (iPP) nanocomposites containing wurtzite-type zinc oxide (ZnO) nanocrystals. The nanocomposites were synthesized via a solution-blending and hot-pressing method, followed by cooling under three distinct modes: slow cooling, ice-water quenching, and liquid-nitrogen quenching. X-ray diffraction (XRD) analysis revealed that slow cooling resulted in the formation of both α- and γ-phases in the iPP matrix, whereas rapid cooling produced only the α-phase. Atomic-force-microscopy analysis showed pronounced morphological differences among samples, with slow-cooled films exhibiting rougher surfaces. The findings demonstrate that controlled melt-cooling rate governs supramolecular structural evolution and interfacial ordering in iPP/ZnO nanocomposites. The increased photoluminescence (PL) in slow-cooled samples is linked to the presence of the γ-phase, which promotes interactions between polymer structural defects and deep-level defects in ZnO crystals. Conversely, dielectric results showed that slow cooling lowered interfacial polarization owing to restricted chain mobility, consistent with the Maxwell-Wagner-Sillars (MWS) theory. These results highlight a distinct process-structure-property relationship and indicate that precise regulation of cooling rate can simultaneously adjust optical and dielectric performance. This work highlights the innovative role of processing-induced supramolecular modification and its importance in the design of tunable materials for optoelectronics, flexible-dielectric components, UV-active coatings, sensing, and advanced packaging applications.
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