Synthesis and characterization of UV‐curable ladder‐like polysilsesquioxane

Choi, Sungwook; Lee, Albert S.; Lee, He Seung; Jeon, Hyeonyeol; Baek, Kyung‐Youl; Choi, Dong Hoon; Hwang, Seung Sang

doi:10.1002/pola.24942

Cited by 90 publications

(85 citation statements)

References 24 publications

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“…2). Second halo, the broad one, can be attributed to intermolecular distance (intermolecular chain-to-chain thickness), or it can be the distance between the ladder structures [20,38,39]. In the case of xerogel T/D = 1/1, first halo (approx.…”

Section: Resultsmentioning

confidence: 99%

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Jeleń

Szumera

Gawęda

et al. 2017

J Therm Anal Calorim

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Pyrolysis of ladder-like silsesquioxanes in oxygen-free atmosphere leads to the formation of silicon oxycarbides (black glasses). Black glasses are materials of amorphous silica structure where some amount of O 2-ions were replaced by C 4-ions. This exchange leads to local increase in bonds density and therefore improvement in mechanical, thermal, and chemical properties. Thanks to this modification, silicon oxycarbide glasses can be used in a variety of applications like: protective coatings and interconnectors in solid oxide fuel cells. Xerogels were prepared by sol-gel method, and ladder-like silsesquioxanes were used as precursors. Samples were burned at 200-1000°C in inert atmosphere. Structural studies in the middle infrared range (MIR) and SEM with EDX confirmed the presence of SiOC bonds in obtained materials. MIR analysis of solid samples together with TG/dTG measurements allowed defining the process for the formation of black glasses.

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Section: Resultsmentioning

confidence: 99%

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Jeleń

Szumera

Gawęda

et al. 2017

J Therm Anal Calorim

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“…1 3 The branched analogue of linear Vi-LPSQs was prepared according to the literature procedure [1]. The product was obtained as an insoluble solid (reaction yield: 90 %).…”

Section: Preparation Of Vi-lpsqs By Stepwise Coupling Polymerizationmentioning

confidence: 99%

“…Their hybrid structure (inorganic double chain backbone and organic side groups) results in a low dielectric constant. They are not only thermally-and chemically resistant but also well soluble in organic solvents and show good film-forming properties, so they are attractive as functional materials [1].…”

Section: Introductionmentioning

confidence: 99%

“…We have found that, under specific conditions, condensation of silanol groups in 2,4,6,8-tetrahydroxy-2,4,6,8-tetrafunctional cyclosiloxanes, prepared in situ from the respective potassium silanolates, can give oligomeric materials with ladder structure (Scheme 1). Reference materials were prepared by simple hydrolytic condensation of ViSi(OEt) 3 in the presence of K 2 CO 3 [1] and stepwise coupling polymerization [22]. The structure and the properties of the resulting materials were analyzed by use of NMR, XRD, TGA, DSC, SEC (MALLS and RI) and MALDI-TOF.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Ladder Silsesquioxanes by in situ Polycondensation of Cyclic Tetravinylsiloxanetetraols

Kowalewska

Nowacka

2014

Silicon

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Functionalized tetrahydroxy-cyclotetrasiloxanes are very attractive precursors of tetrasiloxane ring systems in linear silsesquioxanes (LPSQs). Vinyl groups are especially important since they can be employed for various chemical transformations (e.g. hydrosilylation, metathesis reactions, thiol-ene addition). However, isolation of such highly reactive species bearing small side substituents at silicon atoms with high yield is challenging. We overcame the problem by in situ condensation of 2,4,6,8-tetrahydroxy-2,4,6,8-tetravinyl-cyclotetrasiloxanes, derived from potassium organosiloxanolateOligomeric LPSQ materials having a siloxane backbone with ladder structure and functionalized with side vinyl groups were thus prepared. Hexamethyldisilazane was employed for chain termination. The liquid materials show remarkably good solubility in organic solvents. They were isolated and characterized using spectroscopic methods. Information on their structure and molecular masses was derived from MALDI-TOF and MALLS measurements. Size exclusion chromatography (RI detection, volume of elution measurements) was also used. The products were characterized by wide-angle X-Ray diffraction measurements (WAXS) and their thermal characteristics (TGA and DSC) were obtained.

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“…Two absorption peaks at 1131 and 1040 cm −1 , corresponding to Si-O-Si stretching vibrations, were observed in all samples. The bimodal absorption peaks indicate the formation of ladder-type structures [49][50][51].…”

Section: Synthesismentioning

confidence: 99%

A Ladder-Type Organosilicate Copolymer Gate Dielectric Materials for Organic Thin-Film Transistors

Kim

2018

Coatings

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A ladder-type organosilicate copolymer based on trimethoxymethylsilane (MTMS) and 1,2-bis(triethoxysilyl)alkane (BTESn: n = 2-4) were synthesized for use as gate dielectrics in organic thin-film transistors (OTFTs). For the BTESn, the number of carbon chains (2-4) was varied to elucidate the relationship between the chemical structure of the monomer and the resulting dielectric properties. The developed copolymer films require a low curing temperature (≈150 • C) and exhibit good insulating properties (leakage current density of ≈10 −8 -10 −7 A·cm −2 at 1 MV·cm −1 ). Copolymer films were employed as dielectric materials for use in top-contact/bottom-gate organic thin-film transistors and the resulting devices exhibited decent electrical performance for both p-and n-channel organic semiconductors with mobility as high as 0.15 cm 2 ·V −1 ·s −1 and an I on /I off of >10 5 . Furthermore, dielectric films were used for the fabrication of TFTs on flexible substrates.

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Synthesis and characterization of UV‐curable ladder‐like polysilsesquioxane

Cited by 90 publications

References 24 publications

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Synthesis of Ladder Silsesquioxanes by in situ Polycondensation of Cyclic Tetravinylsiloxanetetraols

A Ladder-Type Organosilicate Copolymer Gate Dielectric Materials for Organic Thin-Film Transistors

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