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    What makes glue stick?

    its sticky chemical structure.

    (Original post by Unregistered)
    What makes glue stick?

    lou xxx

    thanks lou

    What's that unregistered guy talking about? Chemicals?

    (Original post by Unregistered)
    thanks lou

    What's that unregistered guy talking about? Chemicals?
    yeah, i just felt like randomly saying the most mature thing i could think of... and that was it...

    i have no idea what he's going on about. i think he was trying to be amusing by calling it 'sticky' then talking about glue... anyone notice how people normally refer to unregs in a male context?

    lou xxx

    The Unregistereds are all collectively men. Unless you include Maskall, in which case, they're all men and 1 child.

    There is no common [or even uncommon] chemical characteristic shared by all
    glues. Tell your kids to stop looking; it isn't there.

    The reason is not to be found in the adhesive but in the adherends [i.e., the
    things being glued together]. If all the world were made of paper, some common
    characteristics would emerge but it is the broad diversity of things that are
    glued that demands a diverse range of chemistries to bond them. There are about
    35 major chemical types of adhesives in use today, each with dozens [if not
    hundreds] of sub-types. Combine this with all the solid [and semi-solid] things
    that you can think of like wood, paper, glass, metal, rock, fiber, leather,
    skin, plastics, rubber etc., etc. Bonding glass to glass [to make 'safety
    glass'] requires a very different adhesive than one used for bonding glass to
    rubber [used to bond a 'safety glass' windshield to the rubber weather strip
    around the windshield on your car].

    An excellent general reference on this subject is the Handbook of Adhesives,
    3rd Edition, Irving Skeist, editor, Van Nostrand Reinhold Co.

    Your yucca experiment makes use of one of the most commonly used adhesives in
    the world today: starch. While corn starch is the most commonly used one, other
    commercial sources include tapioca, sago, wheat and potato starches.

    Starch glues are widely used in the bonding of paper, wood and cotton. A
    general rule of thumb for adhesives is "Like bonds to Like" [the opposite of
    magnetism, in which like poles repel]. Starch is a carbohydrate that is very
    similar to the carbohydrate cellulose, which is the major component of paper,
    wood and cotton.

    Starch is insoluble in cold water but dissolves readily in hot or boiling
    water. The process is exactly the same as making gravy -- mix some cornstarch
    in a little cold water and add it to the hot stock and stir. In a few minutes
    the starch dissolves and thickens the gravy. Starch glues are the same [but
    without the flavor].

    Virtually all corrugated boxboard is made with starch glues as are all brown
    paper grocery bags, tubes [as in toilet paper cores], and such similar items.
    Exact formulations vary but these are usually about 12 to 15% starch with the
    balance being water and minor ingredients. White library paste is 45% starch,
    55% water.

    The water contained in starch based glue is present only as a vehicle, or
    carrier, of the starch. For the bond to form, the water must either be
    evaporated or absorbed [dried].

    When you take a dress shirt to the cleaners you'll be asked "How much starch do
    you want?" Yup, same stuff, but starch also played a major role in making the
    shirt in the first place.After the cotton fibers are spun into yarn, but before
    they are woven into cloth, the yarn is dipped into a starch solution and dried
    to give them enough extra strength to survive the rigors of the weaving
    process. After being woven, the cloth is boiled in water to re-dissolve the
    starch so that it doesn't feel too stiff in the store when you buy it [this is
    true for all cotton fabrics except denim, which still has the starch in it when
    sold which is why a new pair of blue jeans feel so stiff]. This type of starch
    glue is called a 'sizing'

    Hope this helps!
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