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• W2955763615 abstract "It was recently shown that molecularly dispersed octaisobutyl-polyhedral oligomeric silsesquioxane (bu-POSS) nanoparticles acted like nanoplugs and reduced O2 transmission in low-density polyethylene (LDPE) (Romo-Uribe, A.; Polymer 2019, 165, 61−71, DOI: 10.1016/j.polymer.2019.01.024). Here, the influence of alkyl group on O2 transmission and chain dynamics was investigated by dispersing octamethyl-POSS nanoparticles (me-POSS) in LDPE. me-POSS was melt mixed with LDPE by twin-screw extrusion. High-resolution transmission electron microscopy (HRTEM) and wide-angle X-ray scattering showed that me-POSS is of ca. 0.8 nm size (bu-POSS size is ca. 1.5 nm), and at concentration cPOSS ≤ 5 wt % me-POSS was effectively dispersed into LDPE at a single unit. The chain dynamics was studied by small-strain oscillatory shear and the time–temperature superposition (TTS) principle was used to construct master curves at Tref = 190 °C. me-POSS nanoparticles induced chain disentanglements and reduction of terminal relaxation time τt, which translated into an anomalous, non-Einstein-like reduction of zero-shear rate viscosity ηo. However, me-POSS produced shorter terminal relaxation time τt and induced much greater reduction of ηo than bu-POSS. These results suggest that the size of me-POSS is key for inducing faster dynamics and greater viscosity reduction than bu-POSS. Consequently me-POSS intercalated the entangled molecular mesh and produced a nanoplug effect reducing O2 transmission. However, ca. 5 wt % me-POSS was required to reduce O2 transmission against only ca. 2 wt % bu-POSS, hence reflecting the influence of POSS size." @default.
• W2955763615 created "2019-07-12" @default.
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• W2955763615 date "2019-07-01" @default.
• W2955763615 modified "2023-10-18" @default.
• W2955763615 title "Chain Disentanglements and Oxygen Transmission Reduction in LDPE/POSS Nanocomposites. Influence of POSS Size" @default.
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• W2955763615 doi "https://doi.org/10.1021/acs.iecr.9b01846" @default.
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