Preparation and Properties of Hybrid Materials Originating from Polybenzoxazines and Silsesquioxanes

Fu, Zien; Xu, Kai; Liu, Xin; Wu, J.Z.; Tan, Chanjuan; Chen, Mingcai

doi:10.1002/macp.201200604

Cited by 18 publications

(10 citation statements)

References 37 publications

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“…The resulting polybenzoxazines show many unique properties such as near‐zero volume changes upon polymerization, low water absorption, variable range of glass transition temperature, fast physical and mechanical properties development at low conversion, and high char yield . One additional advantage of polybenzoxazines is its good and easy compatibility with other polymers, thus enhancing the final properties of the obtained materials …”

Section: Introductionmentioning

confidence: 99%

Study of the Effects of Intramolecular and Intermolecular Hydrogen‐Bonding Systems on the Polymerization of Amide‐Containing Benzoxazines

Han

Zhang

Ishida

et al. 2017

Macro Chemistry & Physics

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Pure para and ortho position amide benzoxazines, pHBA-a and oHBA-a, are synthesized. The hydrogen bonding interactions occurring in pHBA-a and oHBA-a are studied by Fourier transform infrared (FT-IR) spectroscopy and proton nuclear magnetic resonance ( 1 H NMR) spectroscopy. FT-IR results show that, while pHBA-a presents intermolecular hydrogen bonding interactions, oHBA-a exhibits an intramolecular five-membered-ring hydrogenbonding system between the NH in the amide group and the oxygen in the oxazine ring. Differential scanning calorimetry (DSC) is used to study the thermal properties of the resins and their respective polymers. A deeper understanding of the hydrogen bond interactions in this family of resins is attempted to have better insights on how these systems influence the polymerization behavior not only with respect to the polymerization temperature but also with respect to the propagation step.

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Section: Introductionmentioning

confidence: 99%

Study of the Effects of Intramolecular and Intermolecular Hydrogen‐Bonding Systems on the Polymerization of Amide‐Containing Benzoxazines

Han

Zhang

Ishida

et al. 2017

Macro Chemistry & Physics

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“…The char yield at 800 °C in nitrogen atmosphere was 77.8% for EVHS and 75.2% for EVTS, respectively. The high char yield suggested the outstanding flame retardancy of these silicone resins …”

Section: Resultsmentioning

confidence: 99%

A facile route to prepare homogeneous silicone resin doped with titanium

Chen

Huang

et al. 2019

J of Applied Polymer Sci

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A facile route was introduced to prepare homogeneous silicone resin doped with titanium hybrid with high refractive index (RI). Specifically, the hybrids were obtained from the transesterification of hydroxyl‐phenyl‐vinyl silicone resin and titanium isopropoxide under anhydrous conditions. The structures of hybrid silicone and their corresponding intermediates (hydroxyl‐phenyl‐vinyl silicone) were characterized by nuclear magnetic resonance spectroscopy (1H NMR, 29Si NMR) as well as Fourier transform infrared spectroscopy (FTIR). The hybrids had a transmittance of more than 88% ranging from 450 nm to 800 nm, a high RI of 1.585, and a lower water vapor permeability of 3.58 g /m2.24h. Results from FTIR showed intensity of Ti‐O‐Si bond in hybrid decrease with extended the storage time, but the properties of cured hybrids including optical, mechanical, and gas permeability were not influenced. Compared to chips encapsulated with pure silicone, the luminous efficiency of the chips encapsulated with hybrids was improved from 138.6 lm/W to 156.4 lm/W. The thermal shock and hygrothermal aging test also demonstrated the hybrids had a wide range application in light‐emitting diode (LED) packaging. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47834.

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“…There have been many developments in hybrid materials derived from silsesquioxanes (SQ) in recent years. [24][25][26][27][28][29][30][31][32] The term silsesquioxane refers to all structures with the empirical formula RSiO1.5, where R is hydrogen or any alkyl, alkylene, aryl, arylene, or organofunctional derivative of alkyl, alkylene, aryl, or arylene groups. 33,34 Many application areas have emerged for SQ-based materials, including biomaterials, dielectric materials, and those for organic light emitting diode devices.…”

Section: Introductionmentioning

confidence: 99%

Beads on a Chain (BoC) Fluorescent Oligomeric Materials: Interactions of Conjugated Organic Cross-Linkers with Silsesquioxane Cages

Mahbub¹,

Saha²,

Ramakrishna³

et al. 2021

Preprint

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<div> <div> <div> <p>Organic electronic materials have advantages over inorganics in terms of versatility, cost and processability. Recent advancements in organic materials for light emitting diodes (OLED), field effect transistors (OFET), and photovoltaics have engendered extensive innovation potential on this field. In this research, we focus on synthesizing SQ (silsesquioxane) based oligomers cross- linked by di-bromo-aromatic linkers and explore how the cross-linker and oligomer length influence their photophysical properties. Bis-tri-alkoxy silyl (linker) model compounds were synthesized to compare non-cage photophysical properties with the oligomers. Several techniques such as UV/Vis, fluorescence, FTIR, thermal gravimetric analysis (TGA) have been used to characterize the systems. Time-resolved fluorescence and femtosecond transient absorption spectroscopy are used to understand the excited state dynamics of these materials. Studies are carried out to understand the differences between monomers and oligomers and potential energy transfer and charge transfer between the cages and cross-linking chromophores. Transient absorption showed lower energy absorption from the excited states, suggesting short range communication between moieties. Single photon counting studies have shown distinct lifetime differences between most linkers and cages showing possible excitation energy transfer through these materials. Transient absorption anisotropy measurements have shown signatures for excitation energy transfer between linker chromophores for oligomeric compounds. The silsesquioxane (SQ) backbone of the oligomers gives substantial thermal stability as well as solution processability, giving better flexibility for achieving energy transfer between linking chromophores. </p> </div> </div> </div>

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Preparation and Properties of Hybrid Materials Originating from Polybenzoxazines and Silsesquioxanes

Cited by 18 publications

References 37 publications

Study of the Effects of Intramolecular and Intermolecular Hydrogen‐Bonding Systems on the Polymerization of Amide‐Containing Benzoxazines

Study of the Effects of Intramolecular and Intermolecular Hydrogen‐Bonding Systems on the Polymerization of Amide‐Containing Benzoxazines

A facile route to prepare homogeneous silicone resin doped with titanium

Beads on a Chain (BoC) Fluorescent Oligomeric Materials: Interactions of Conjugated Organic Cross-Linkers with Silsesquioxane Cages

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