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Synthesis and thermal behaviour of phenyl-substituted POSSs linked by aliphatic and aromatic bridges

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Abstract

Five novel bridged heptaphenyl polyhedral oligomeric silsesquioxanes (POSSs), in which two identical silicon cages R7(SiO1.5)8 (with R = Phenyl) are linked to various aliphatic [(CH2) n with n = 2, 6 and 10] and aromatic (Ar–Ar and Ar–O–Ar, where Ar = p-C6H4) bridges, were synthesized. The obtained compounds were characterized by elemental analysis and 1 H NMR spectroscopy, and the results were in very good agreement with those of expected products. The synthesized heptaphenyl POSSs were thermally degraded, in dynamic heating conditions (25–700 °C), in both flowing nitrogen and static air atmosphere. The temperatures at 5% mass loss (T 5%) and residues at 700 °C were thus determined to evaluate their resistance to thermal degradation, but no substantial difference was found between the values in the two studied environments. The obtained T 5% values were much higher than those of the corresponding isobutyl and cyclopentyl POSSs we investigated in the past. Also, the T 5% values of the phenyl POSSs with aliphatic bridges decreased quite linearly on increasing the number of bridge carbon atoms (n C). This behaviour was interpreted and attributed to the presence of the external corona formed by voluminous phenyl groups. The residue at 700 °C, which was largely higher than those of the corresponding isobutyl and cyclopentyl POSSs, was a further confirmation of the better thermal stability of the compounds here studied.

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Authors and Affiliations

  1. Department of Civil Engineering and Architecture and INSTM UdR, University of Catania, V.le a. Doria 6, 95125, Catania, Italy

    Ignazio Blanco & Lorenzo Abate

  2. Department of Chemical Sciences, University of Catania, V.le a. Doria 6, 95125, Catania, Italy

    Francesco A. Bottino

Authors
  1. Ignazio Blanco
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  2. Lorenzo Abate
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  3. Francesco A. Bottino
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Correspondence to Ignazio Blanco.

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Blanco, I., Abate, L. & Bottino, F.A. Synthesis and thermal behaviour of phenyl-substituted POSSs linked by aliphatic and aromatic bridges. J Therm Anal Calorim 131, 843–851 (2018). https://doi.org/10.1007/s10973-017-6608-6

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  • DOI: https://doi.org/10.1007/s10973-017-6608-6

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