Photolysis and thermal active polymerization of bis (benzylidene) based benzoxazine monomers

M. R. Vengatesan, S. Devaraju, M. Selvi, A. Chandramohan, A. Ashok Kumar, M. Alagar

    Research output: Contribution to journalArticlepeer-review

    17 Scopus citations

    Abstract

    A new class of photopolymerizable benzoxazine monomers has been developed, using photoactive bisphenol derivatives such as bis (4-hydroxybenzylidene)-4- phenyl cyclopentanone and bis (4-hydroxybenzylidene)-4-phenyl cyclohexanone, p-toludine and formaldehyde (37%). The structure of the benzoxazine monomers has been confirmed by Fourier Transform Infra Red spectroscopy (FTIR) and 1H and 13C Nuclear Magnetic Resonance spectroscopy (NMR). Upon photolysis with radiation of 365 nm, the monomers undergo photolysis via [2π + 2π] cyclo-addition reaction, which was confirmed by UV spectroscopy. After photolysis, the benzoxazine monomers were subsequently cured at 200 °C for 2 h. The photo irradiated cured products possessed enhanced glass transition temperature and thermal stability, with an increase in the photodimerization time.

    Original languageBritish English
    Pages (from-to)162-166
    Number of pages5
    JournalJournal of Molecular Structure
    Volume1027
    DOIs
    StatePublished - 14 Nov 2012

    Keywords

    • Bis (benzylidene)
    • Glass transition temperature
    • Photo cross linking
    • Polybenzoxazine
    • Thermal stability

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