Examining the thermal behaviour of novel aromatic polybenzoxazine blends containing an organophosphorous compound and polyhedral oligomeric silsesquioxane reagents

Medientyp: E-Artikel
Titel: Examining the thermal behaviour of novel aromatic polybenzoxazine blends containing an organophosphorous compound and polyhedral oligomeric silsesquioxane reagents
Beteiligte: Kopsidas, Sotirios; Hamerton, Ian
Erschienen: Wiley, 2016
Erschienen in: Polymer International
Sprache: Englisch
DOI: 10.1002/pi.5139
ISSN: 0959-8103; 1097-0126
Schlagwörter: Polymers and Plastics ; Materials Chemistry ; Organic Chemistry
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Beschreibung: <jats:title>Abstract</jats:title><jats:p>2,2‐Bis(3,4‐dihydro‐3‐phenyl‐2<jats:italic>H</jats:italic>‐1,3‐benzoxazine)propane (<jats:styled-content style="fixed-case">BA</jats:styled-content>‐a) is blended with various commercial polyhedral oligomeric silsesquioxane (<jats:styled-content style="fixed-case">POSS</jats:styled-content>) reagents and an organophosphorous compound, bis(4‐hydroxyphenyl)phenylphosphine oxide (<jats:styled-content style="fixed-case">BPPO</jats:styled-content>), at a range of loadings (1–10 wt%). The influence of the additives on the onset and rate of polymerisation of <jats:styled-content style="fixed-case">BA</jats:styled-content>‐a is examined using differential scanning calorimetry. An initial screen of blends containing various additives (5 wt%) shows that a combination of aminoethylaminopropyl isobutyl <jats:styled-content style="fixed-case">POSS</jats:styled-content> (<jats:styled-content style="fixed-case">AEAP</jats:styled-content>) and <jats:styled-content style="fixed-case">BPPO</jats:styled-content> has the greatest effect on reactivity with a reduction in reaction onset of some 65 K and an increase in glass transition temperature of 18 K when compared with the <jats:styled-content style="fixed-case">BA</jats:styled-content>‐a homopolymer. The activation energy for the polymerisation of <jats:styled-content style="fixed-case">BA</jats:styled-content>‐a containing 5 wt% <jats:styled-content style="fixed-case">AEAP</jats:styled-content> is determined to be 84–88 <jats:styled-content style="fixed-case">kJ</jats:styled-content> mol<jats:sup>−1</jats:sup> (using Kissinger and Ozawa kinetic models), with a first‐order rate constant of 1.9 × 10<jats:sup>8</jats:sup> s<jats:sup>−1</jats:sup>. The thermal stability of the cured blends containing 5 wt% flame retardant is examined using thermogravimetric analysis, and both onset of degradation and char yield are increased by 15 K and 5%, respectively, when compared with the <jats:styled-content style="fixed-case">BA</jats:styled-content>‐a homopolymer. © 2016 Society of Chemical Industry</jats:p>

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