Synthesis and Curing of Hyperbranched Poly(triazole)s with Click Polymerization for Improved Adhesion Strength

Youhong Tang, Cathy Jim, Yang Liu, Lin Ye, A Qin, W Lam, Chengbi Zhao, Ben Tang

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    We successfully synthesized hyperbranched poly(triazole)s by in situ click polymerization of diazides 1 and triyne 2 monomers on different metal surfaces (copper, iron, and aluminum) and characterized their adhesive properties. Optimizations were performed to obtain high adhesive strength at different temperatures by analyzing the effects of curing kinetics, annealing temperature and time, catalyst, monomer ratio, surface conditions, alkyl chain length of diazides 1, etc. The adhesive bonding strength with metal substrate is 2 orders of magnitude higher than similar hyperbranched poly(triazole)s made by click polymerization and clearly higher than some commercial adhesives at elevated temperatures. With the same conditions, adhesives prepared on aluminum and iron substrates have higher adhesive strength than those prepared on copper substrate, and an excess of triyne 2 monomer in synthesis has greater adhesive strength than an excess of diazide 1 monomer. Tof-SIMS experiment was employed to understand these phenomena, and the existence of an interphase between the polymer and metal surface was found to be critical for adhesive bonding with thicker interphase (excess of triyne 2 monomer) and the higher binding energy between polymer atoms and substrate atoms (e.g., aluminum substrate) generating the higher bonding strength. In addition, the light-emitting property of synthesized polymers under UV irradiation can be used to check the failure mode of adhesive bonding.

    Original languageEnglish
    Pages (from-to)566-574
    Number of pages9
    JournalACS Applied Materials & Interfaces
    Volume2
    Issue number2
    DOIs
    Publication statusPublished - 24 Feb 2010

    Keywords

    • Adhesion strength
    • Click polymerization
    • High-temperature adhesive
    • Hyperbranched poly(triazole)s
    • Light emission

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