Synthesis and characterization of nanocrystalline polyhedral oligo silsesquioxanes (POSS) with cross-linkable functionalities
摘要:
A facile synthesis was employed for three polyhedral oligo silsequioxanes (POSS), obtaining incompletely condensed structures with fern-like and cubic morphologies. Proton nuclear magnetic resonance spectroscopy (H-1 NMR) indicated the successful synthesis of the proposed POSS structures. The hydroxyl groups affected the manner and type of POSS morphology, as seen under a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Fourier-transform infrared spectroscopy (FTIR) showed the availability of surface hydroxyl groups that contributed to the formation of a higher amount of char residue, as found from TGA analysis. The highest decomposition temperature (281 degrees C) and the least char residue were found for a cross-linkable POSS, obtained by esterification of the hydroxyl groups with methacryloyl chloride. (C) 2019 Elsevier Ltd. All rights reserved.
Synthesis and characterization of nanocrystalline polyhedral oligo silsesquioxanes (POSS) with cross-linkable functionalities
摘要:
A facile synthesis was employed for three polyhedral oligo silsequioxanes (POSS), obtaining incompletely condensed structures with fern-like and cubic morphologies. Proton nuclear magnetic resonance spectroscopy (H-1 NMR) indicated the successful synthesis of the proposed POSS structures. The hydroxyl groups affected the manner and type of POSS morphology, as seen under a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Fourier-transform infrared spectroscopy (FTIR) showed the availability of surface hydroxyl groups that contributed to the formation of a higher amount of char residue, as found from TGA analysis. The highest decomposition temperature (281 degrees C) and the least char residue were found for a cross-linkable POSS, obtained by esterification of the hydroxyl groups with methacryloyl chloride. (C) 2019 Elsevier Ltd. All rights reserved.
Incompletely condensed POSS-based spin-on-glass networks for impeccable ultra low-k integration
作者:Albert S. Lee、Seung-Sock Choi、Sung Yeoun Oh、He Seung Lee、Bomin Kim、Seung Sang Hwang、Kyung-Youl Baek
DOI:10.1039/c5tc02683k
日期:——
The integration reliability of mechanically robust, ultra low-k spin-on-glass poly(methyl)silsesquioxanes incorporating incompletely condensed methyl-POSS were examined for next generation microelectronics.
High-speed experimentation techniques applied to the study of the synthesis of zeolites and silsesquioxanes
作者:Paolo P Pescarmona、Johannes J.T Rops、Jan C van der Waal、Jacobus C Jansen、Thomas Maschmeyer
DOI:10.1016/s1381-1169(01)00494-0
日期:2002.5
High-speed experimentation (HSE) techniques are newly developed methods that, allowing the fast preparation and analysis of large numbers of parallel experiments, enable to screen an extensive parameter space. These techniques are particularly useful to investigate chemical systems for which a precise knowledge of the overall reaction or formation mechanism is not available. Here, we report the application of HSE techniques to the study of the synthesis of two families of siloxane compounds: zeolites and silsesquioxanes. Zeolites are well known crystalline microporous materials with broad applications as heterogeneous catalysts. Silsesquioxanes are small, discrete siloxane cages used both as homogeneous catalysts and as model compounds for silica surfaces and zeolites. With our HSE approach we were able to investigate the synthesis of alummium-rich zeolite beta (Si/Al ratio from 2.5 to 5) and to identify a new and fast way to synthesise silsesquioxane precursors for Ti-catalysts active in the epoxidation of alkenes. (C) 2002 Elsevier Science B.V. All rights reserved.