Synthesis and properties of polyimides containing hexaisobutyl-substituted T<sub>8</sub> cages in their main chains

Maegawa, Taketeru; Miyashita, O.; Irie, Y.; Imoto, Hiroaki; Naka, Kensuke

doi:10.1039/c6ra04860a

Cited by 42 publications

(16 citation statements)

References 54 publications

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“…Caged polysilsesquioxane is a good choice for the preparation of transparent PI with high T g due to its large space volume and excellent thermal stability. Maegawa et al 124 used bis(3‐aminopropyl)hexaisobutyl‐substituted T 8 (Figure 10a) containing a cage polysilsesquioxane to polymerize with 6FDA and PMDA, respectively. PI T8 ‐6FDA is colorless and transparent, with its λ 0 319 nm and T 360 greater than 80% (100 μm).…”

Section: Transparent Pi With High Tgmentioning

confidence: 99%

Synthetic strategies for highly transparent and colorless polyimide film

Liu

Wang

2022

J of Applied Polymer Sci

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Polyimide (PI) is one of the best engineering plastics with excellent thermal, mechanical, dielectric performance and chemical stability. Among various PI products, film is one of the most dominant types. If PI films are to be applied to optical devices and display equipment, it is necessary to improve their optical transparency in the ultraviolet–visible region. However, improving the optical transparency of PI films would affect their thermal performance including thermal and dimensional stability. Therefore, how to balance optical and thermal performance to obtain highly transparent PI films with the best overall performance becomes a focus of current research field. In this review, we categorize transparent PI films into highly transparent PI, transparent PI with high glass transition temperature (Tg) and transparent PI with low coefficient of thermal expansion (CTE) based on their optical and thermal properties. Then, we review research progress in the field of polymer molecular design including synthesis strategies and properties in recent 5 years, to inspire research ideas and elaborate on the possible ways to develop high‐performance, colorless and transparent PI materials.

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Section: Transparent Pi With High Tgmentioning

confidence: 99%

Synthetic strategies for highly transparent and colorless polyimide film

Liu

Wang

2022

J of Applied Polymer Sci

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“…The materials are known for their well-defined structures containing rigidly inorganic cores with organic substituents in the peripheral. [8][9][10][11][12][13] Several types of POSS-based polymers have been prepared, including main-chain types from bifunctional POSS monomers [13][14][15][16][17][18][19] and network types from octa-functional POSSs. [20][21][22][23][24] However, POSSs for the former category are limited to certain organic substituents on their peripheral, while it is difficult to control the crosslinking of the latter type.…”

Section: Introductionmentioning

confidence: 99%

Soluble network polymers based on trifluoropropyl‐substituted open‐cage silsesquioxane: Synthesis, properties, and application for surface modifiers

Imoto

Naka

2020

J of Applied Polymer Sci

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Fluorinated completely condensed polyhedral oligomeric silsesquioxanes (F-CC-POSSs) are widely utilized as surface modifiers for polymeric materials because of their polyhedral and fluorine-rich structures, which generate polymers with lower surface energies under molecular-level control. In contrast, their derivatives, fluorinated incompletely condensed or open-cage POSSs (F-IC-POSSs), have similarly intriguing structures, but their utilization for polymer synthesis remains undeveloped. Herein, fluorinated network polymers were prepared based on a 3,3,3-trifluoropropyl-substituted IC-POSSs via hydrosilylation polymerization with isobutyl-and phenyl-substituted IC-POSS under optimized conditions. In addition to their good thermal stability and tunable refractive indices, these polymers exhibited solution processability and their casting films showed excellent optical transparency, indicating their potential for constructing fluorinated polymers. Their utilization as surface modifiers was examined by addition to poly(methylmethacrylate) (PMMA) films. Intriguingly, modified PMMA films with 2.0 and 0.5 wt% addition showed similar hydrophobicity and surface energies to the films prepared with only fluorinated network polymers.

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“…We recently reported that para ‐bis(3‐aminopropyl)hexaisobutyl‐substituted T 8 cage ( bis‐T 8 ) was successfully synthesized . Incorporation of the T 8 unit in the main chain significantly improves hydrophobicity as well as increasing their glass transition temperatures …”

Section: Introductionmentioning

confidence: 99%

“…13 Incorporation of the T 8 unit in the main chain significantly improves hydrophobicity as well as increasing their glass transition temperatures. 14,15 Here, we first time prepared main-chain type POSS containing coordination polymers. Transition metal complexes with Schiff base ligands are promising materials for optoelectronic applications and the ease of synthesis that readily allows structural modification for optimization of material properties.…”

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confidence: 99%

Synthesis of metallosupramolecular polymers incorporating cage silsesquioxanes in the main chains

Hashimoto

Fujii

Imoto

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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We first time prepared main‐chain type cage octasilsesquioxane (T8) containing coordination polymers based on transition metal complexes with a bis‐Schiff base T8 ligand (bis‐SA‐T8), which was prepared from para‐bis(3‐aminopropyl)hexaisobutyl‐substituted T8 cage (bis‐T8) with salicylaldehyde. A mono‐Schiff base T8 ligand (SA‐T8) was prepared from 3‐aminopropylheptaisobutyl‐substituted T8 cage (mono‐T8) with salicylaldehyde. Coordination of bis‐SA‐T8 with Cu2+ and Zn2+ in a solution as well as the film state was confirmed by the d–d transition appearing as broad shoulder on the longer wavelength at around 600 nm and the fluorescence at around 440–470 nm, respectively. The resulting metallosupramolecular polymers gave optically transparent films in the visible region by a casting method. However, opaque green and whitish films were obtained in the case of the Cu2+ and Zn2+ complexes with SA‐T8, respectively. The thermal stabilities of the metallosupramolecular polymers were higher than those of the corresponding metal complexes of SA‐T8. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2260–2266

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Synthesis and properties of polyimides containing hexaisobutyl-substituted T₈ cages in their main chains

Abstract: We prepared two types of polyimides containing T8 cages in the main chains by polymerization of para-substituted bis(3-aminopropyl)hexaisobutyl-substituted T8 cage, and studied their mechanical, thermal, and optical properties.

Cited by 42 publications

References 54 publications

Synthetic strategies for highly transparent and colorless polyimide film

Synthetic strategies for highly transparent and colorless polyimide film

Soluble network polymers based on trifluoropropyl‐substituted open‐cage silsesquioxane: Synthesis, properties, and application for surface modifiers

Synthesis of metallosupramolecular polymers incorporating cage silsesquioxanes in the main chains

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Synthesis and properties of polyimides containing hexaisobutyl-substituted T8 cages in their main chains

Abstract: We prepared two types of polyimides containing T8 cages in the main chains by polymerization of para-substituted bis(3-aminopropyl)hexaisobutyl-substituted T8 cage, and studied their mechanical, thermal, and optical properties.

Cited by 42 publications

References 54 publications

Synthetic strategies for highly transparent and colorless polyimide film

Synthetic strategies for highly transparent and colorless polyimide film

Soluble network polymers based on trifluoropropyl‐substituted open‐cage silsesquioxane: Synthesis, properties, and application for surface modifiers

Synthesis of metallosupramolecular polymers incorporating cage silsesquioxanes in the main chains

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Synthesis and properties of polyimides containing hexaisobutyl-substituted T₈ cages in their main chains