Studies of polycyanurates based on phenoxy-substituted cyclic phosphazenes: Synthesis of the monomer and a preliminary study of its thermal properties in binary blends

Ian Hamerton*, Simon Glynn, Mark A. Pullinger, Stephen J. Shaw

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)

Abstract

The four-step preparation of a new monomer, 1,2,3-tris(4-cyanatophenoxy)-, 3′,5,5-tris-phenoxy-2λ 5,4λ 5, 6λ 5-[1,3,5,2,4,6]-triazatriphosphinine, is reported. Characterization of the monomer is undertaken using spectroscopic and chromatographic methods and elemental analysis and the data are in agreement with the proposed structure (as a mixture of isomers). The thermal polymerization of the monomer and its behaviour within selected blends containing 2,2-bis(4-cyanatophenyl)propane (AroCy B10) are studied using differential scanning calorimetry. The blends appear to melt sharply at ca. 80 °C onset of polymerization (corresponding to the melting point of the commercial dicyanate) before commencing polymerization directly thereafter. Typical exothermic peak maxima at ca. 135°C are observed, whilst the cure is apparently concluded by 200°C under the scanning conditions. On rescan, the cured samples display glass transition values in the region of 160-190°C, depending on composition with the higher values reflecting increasing amounts of the new material. The cured polycyanurate of the tricyclophosphazene is also analysed using thermogravimetric analysis and displays a mass loss of 5% at approximately 381°C in air and 366°C in nitrogen. When 1,2,3-tris(4-cyanatophenoxy)-,3′,5,5-tris-phenoxy-2λ 5, 4λ 5,6λ 5-[1,3,5,2,4,6]-triazatriphosphinine is combined with AroCy B10, the cured copolymers (containing between 10 and 30 wt% of the tricyclophosphazene) show disappointing thermal stability with a progressive reduction in the onset of degradation with increasing phosphazine content; this may be a result of incomplete cure.

Original languageEnglish
Pages (from-to)679-689
Number of pages11
JournalPolymer Degradation and Stability
Volume97
Issue number4
DOIs
Publication statusPublished - Apr 2012

Keywords

  • Cyanate esters
  • Cyclophosphazenes
  • Synthesis
  • Thermal stability

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