Organosilicon Materials

doi:10.1007/978-3-540-68331-5

Cited by 28 publications

(1 citation statement)

References 9 publications

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“…Each year, an estimated two million of tons of linear and cyclic volatile methyl siloxanes (VMS) are produced globally for use in consumer and industrial applications including as components of personal care products, household cleaners, lubricants, and as starting materials for silicone polymers. − These high production values coupled with the prevalence of VMS in consumer products has led to substantial industrial, governmental, and academic interest in the environmental behavior and fate of VMS. − Despite this interest, there remain gaps in our understanding of the environmental fate of VMS. For instance, a recent study found discrepancies between modeled and measured VMS concentrations, particularly in remote environments, and proposed that the model is missing gas phase removal pathways for VMS …”

Section: Introductionmentioning

confidence: 99%

Atmospheric Chemistry of Volatile Methyl Siloxanes: Kinetics and Products of Oxidation by OH Radicals and Cl Atoms

Alton

Browne

2020

Environ. Sci. Technol.

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Volatile methyl siloxanes (VMS) are ubiquitous anthropogenic pollutants that have recently come under scrutiny for their potential toxicity and environmental persistence. In this work, we determined the rate constants for oxidation by OH radicals and Cl atoms at 297 ± 3 K and atmospheric pressure in Boulder, CO (∼860 mbar) of hexamethyldisiloxane (L2), octamethyltrisiloxane (L3), decamethyltetrasiloxane (L4), dodecamethylpentasiloxane (L5), hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), and decamethylcyclopentasiloxane (D5). Measured rate constants with OH radicals were (1.20 ± 0.09) × 10–12, (1.7 ± 0.1) × 10–12, (2.5 ± 0.2) × 10–12, (3.4 ± 0.5) × 10–12, (0.86 ± 0.09) × 10–12, (1.3 ± 0.1) × 10–12, and (2.1 ± 0.1) × 10–12 cm3 molec–1 s–1, for L2, L3, L4, L5, D3, D4, and D5, respectively. The rate constants for reactions with Cl atoms with the same compounds were (1.44 ± 0.05) × 10–10, (1.85 ± 0.05) × 10–10, (2.2 ± 0.1) × 10–10, (2.9 ± 0.1) × 10–10, (0.56 ± 0.05) × 10–10, (1.16 ± 0.08) × 10–10, and (1.8 ± 0.1) × 10–10 cm3 molec–1 s–1, respectively. Substituent factors of F(−Si(CH3)2OR) and F(−SiCH3(OR)2) are proposed for use in AOPWIN, a common model for OH radical rate constant estimations. Cl atoms can remove percentage levels of VMS globally with potentially increased importance in urban areas.

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Section: Introductionmentioning

confidence: 99%

Atmospheric Chemistry of Volatile Methyl Siloxanes: Kinetics and Products of Oxidation by OH Radicals and Cl Atoms

Alton

Browne

2020

Environ. Sci. Technol.

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Soft Poly(dimethylsiloxane) Elastomers from Architecture‐Driven Entanglement Free Design

et al. 2015

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We fabricate soft, solvent-free polydimethylsiloxane (PDMS) elastomers by crosslinking bottlebrush polymers rather than linear polymers. We design the chemistry to allow commercially available linear PDMS precursors to deterministically form bottlebrush polymers, which are simultaneously crosslinked, enabling a one-step synthesis. The bottlebrush architecture prevents the formation of entanglements, resulting in elastomers with precisely controllable elastic moduli from ~1 to ~100 kPa, below the intrinsic lower limit of traditional elastomers. Moreover, the solvent-free nature of the soft PDMS elastomers enables a negligible contact adhesion compared to commercially available silicone products of similar stiffness. The exceptional combination of softness and negligible adhesiveness may greatly broaden the applications of PDMS elastomers in both industry and research.

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Poly(dimethylsiloxane)‐block‐PM6 Polymer Donors for High‐Performance and Mechanically Robust Polymer Solar Cells

et al. 2023

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High power conversion efficiency (PCE) and stretchability are the dual requirements for the wearable application of polymer solar cells (PSCs). However, most efficient photoactive films are mechanically brittle. In this work, highly efficient (PCE = 18%) and mechanically robust (crack‐onset strain (COS) = 18%) PSCs are acheived by designing block copolymer (BCP) donors, PM6‐b‐PDMSx (x = 5k, 12k, and 19k). In these BCP donors, stretchable poly(dimethylsiloxane) (PDMS) blocks are covalently linked with the PM6 blocks to effectively increase the stretchability. The stretchability of the BCP donors increases with a longer PDMS block, and PM6‐b‐PDMS19k:L8‐BO PSC exhibits a high PCE (18%) and 9‐times higher COS value (18%) compared to that (COS = 2%) of the PM6:L8‐BO‐based PSC. However, the PM6:L8‐BO:PDMS12k ternary blend shows inferior PCE (5%) and COS (1%) due to the macrophase separation between PDMS and active components. In the intrinsically stretchable PSC, the PM6‐b‐PDMS19k:L8‐BO blend exhibits significantly greater mechanical stability PCE80% ((80% of the initial PCE) at 36% strain) than those of the PM6:L8‐BO blend (PCE80% at 12% strain) and the PM6:L8‐BO:PDMS ternary blend (PCE80% at 4% strain). This study suggests an effective design strategy of BCP PD to achieve stretchable and efficient PSCs.

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Organosilicon Materials

Cited by 28 publications

References 9 publications

Atmospheric Chemistry of Volatile Methyl Siloxanes: Kinetics and Products of Oxidation by OH Radicals and Cl Atoms

Atmospheric Chemistry of Volatile Methyl Siloxanes: Kinetics and Products of Oxidation by OH Radicals and Cl Atoms

Soft Poly(dimethylsiloxane) Elastomers from Architecture‐Driven Entanglement Free Design

Poly(dimethylsiloxane)‐block‐PM6 Polymer Donors for High‐Performance and Mechanically Robust Polymer Solar Cells

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