N-(2-biphenylenyl)-4-[2′-phenylethynyl] phthalimide: 2. Detailed study of the monomer cure and properties of the resulting polymer

Alexis Georgiades, Ian Hamerton, John N. Hay*, Henryk Herman, Steve J. Shaw

*Corresponding author for this work

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

1 Citation (Scopus)


A detailed study is presented of the high-temperature cure of the difunctional monomer N-(2-biphenylenyl)-4-[2′-phenylethynyl]phthalimide (BPP) and the thermal properties of the resulting homopolymer. Although the phenylethynyl groups are consumed within 1 h at 370°C, other reactions continue well after this, leading to a cured polymer whose glass transition temperature (Tg) is highly dependent on cure time and temperature. A Tg of 450°C is achieved after a 16 h cure at 400°C. Use of chemometrics to analyse the infrared spectra of curing BPP provides evidence for changes in the aromatic moieties during cure, perhaps indicative of co-reaction between the biphenylene and phenylethynyl groups; however, other processes also contribute to the overall complex cure mechanism. Despite the high Tg values, BPP homopolymer exhibits unacceptably poor thermo-oxidative stability at 370°C, showing a weight loss of about 50 % after 100 h ageing. This is perhaps a result of formation of degradatively unstable crosslink structures during elevated-temperature cure.

Original languageEnglish
Pages (from-to)877-884
Number of pages8
JournalPolymer International
Issue number7
Publication statusPublished - 1 Jul 2004


  • Biphenylene
  • Cure
  • Phenylethynyl
  • Thermal properties
  • Thermo-oxidative stability


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