[Jewelry making - Article 00219] - Re: [Orchid] Superglue and soldering

[Howard Woods]

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>     MMA has the structure H2C=C(CH3)COOCH3, while a typical
>     cyanoacrylate has a structure H2C=C(CN)COOCH3. They differ by the
>     substitution of a -CN group for a -CH3. This substitution makes it
>     easier for the material to polymerize into long carbon chains,
>     much like a zipper closes. OK, you aroused my curiosity! I found a
>     link for the precise mechanism of the reaction:
>     www.campoly.com/notes/001.PDF 

    It appears that the autoionization of water provides a weak base to
    initiate the reaction. Of course, I had to experiment. I dipped a
    dull burr in household ammonia and applied it to a bead of super
    glue. As expected, it really speeds up cure time. I would expect more
    polymer chains each with shorter length with using a surplus of
    hydroxide ions since one ion is needed for each chain. The bond may
    be weaker but it shouldn't make much difference for temporary
    applications. 

    As always, I make a practice of not inhaling anything that comes
    from the soldering process. 

Howard Woods
Watching another beautiful sunrise in Eagle Idaho.

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