Reconsideration of the structure of magnesium n-hexadecylsilicate and other “talc-like” layered magnesium organosilicates

Burkett, Sandra L.; Maumbe, Wayne V.; Lin, Sidney

doi:10.1016/j.clay.2021.106364

Cited by 2 publications

(2 citation statements)

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“…Consistent with this, the solid-state 29 Si NMR (SI, Figure S3) shows the presence of T 1 and a strong T 2 peak (at chemical shifts of −49.6 and −57.8 ppm, respectively), in addition to T 3 at −69.5 ppm. Recent work also suggests the strong possibility of turbostratic disorder in synthetic silsesquioxanes . The 13 C CP-MAS spectrum disclosed the existence of olefinic carbon at 132–140 ppm, while the carbon next to Si appeared at 14 ppm.…”

Section: Resultsmentioning

confidence: 93%

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Polyethylene-Grafted Sheet-like Silsesquioxane Nanocomposites with Unprecedented Adhesion to Polar Substrates

Sharma

Paulbudhe

Bachhar

et al. 2023

ACS Appl. Polym. Mater.

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Polyethylene is a highly apolar polymer with very poor adhesion to most substrates, necessitating the use of tie layers. Therefore, the synthesis of functional polyethylene is a long-standing challenge in catalytic ethylene polymerization. Here, we report the preparation of a nanocomposite comprising polyethylene covalently grafted onto sheet-like silsesquioxanes, with unprecedented adhesion to metal and glass. A norbornene-grafted, layered Mg-silsesquioxane is treated with Grubbs second-generation catalyst (G-II), and the identity of covalently tethered G-II is unambiguously ascertained. Covalently tethered G-II catalyzes the ring opening metathesis polymerization of cyclooctene to poly(cyclooctene). The resulting poly(cyclooctene) is catalytically hydrogenated to yield polyethylene. This polyethylene nanocomposite exhibited a bonding strength of the order of 100 MPa on stainless steel and aluminum, 10-fold higher than reported for engineered polyethylene copolymers. The nanocomposite exhibits an increase in the polar component of surface energy, yet remains compatible and cocrystallizes with a polyethylene matrix.

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Section: Resultsmentioning

confidence: 93%

“…Recent work also suggests the strong possibility of turbostratic disorder in synthetic silsesquioxanes. 41 The 13 C CP-MAS spectrum disclosed the existence of olefinic carbon at 132−140 ppm, while the carbon next to Si appeared at 14 ppm. The remaining carbon atoms could be observed between 30 and 50 ppm.…”

Section: ■ Results and Discussionmentioning

confidence: 98%