A Versatile Equilibrium Method for the Synthesis of High-Strength, Ladder-like Polyphenylsilsesquioxanes with Finely Tunable Molecular Parameters

A versatile equilibrium method for synthesizing ladder-like polyphenylsilsesquioxanes (L-PPSQs) with various molecular weights (from 4 to 500 kDa) in liquid ammonia was developed. The effect of diverse parameters, such as temperature, monomer concentration, reaction time, addition or removal of wate...

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Detalles Bibliográficos
Autores principales: Ershova, Tatyana O., Anisimov, Anton A., Temnikov, Maxim N., Novikov, Maxim A., Buzin, Mikhail I., Nikiforova, Galina G., Dyuzhikova, Yulia S., Ushakov, Ivan E., Shchegolikhina, Olga I., Muzafarov, Aziz M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8705838/
https://www.ncbi.nlm.nih.gov/pubmed/34961003
http://dx.doi.org/10.3390/polym13244452
Descripción
Sumario:A versatile equilibrium method for synthesizing ladder-like polyphenylsilsesquioxanes (L-PPSQs) with various molecular weights (from 4 to 500 kDa) in liquid ammonia was developed. The effect of diverse parameters, such as temperature, monomer concentration, reaction time, addition or removal of water from the reaction medium, on the polycondensation process was determined. The molecular weight characteristics and structure of the L-PPSQ elements obtained were determined by GPC, (1)H, (29)Si NMR, IR spectroscopy, viscometry, and PXRD methods. The physicochemical properties of L-PPSQs were determined by TGA and mechanical analyses.

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