why doesn't glue stick to the inside of the glue bottle?

Question

okay, i'm not disputing the fact that air makes glue dry and stick to stuff. but, even if you left the cap off the glue long enough for all the glue in the bottle to dry, it still wouldn't stick to the bottle. so, i guess the real question is why doesn't glue stick to plastic. because any time you put glue on plastic, it doesn't really stick (with very little effort the glue will come off the plastic). so what's the property between plastic and glue that they don't stick to one another?

Answer 1

Many glues don't stick to plastic, but some do. In general, smooth materials like plastic (especially teflon) or metal are difficult to glue but porous materials like wood or paper or even fabric are easy to glue. If you look at the surface of the paper with a magnifying glass you will see a lot of little bumps and dips. The glue penetrates in there. Imagine what happens to the glue when it dries inside the pores: it's acting like a bunch of little claws. Plastic surface is too smooth for a regular glue. You need to use special glues that partially dissove the plastic and make it stick (Superglue works like this) or epoxy resins.

Answer 2

Why doesn't glue stick to the inside of the bottle? No oxygen -If nobody buys a ticket to a movie do they still show it? Yes -How old are you before it can be said you died of old age? 50+ -Do penguins have knees? If they can bed their legs -Why do people constantly return to the refrigerator with hopes that something new to eat will have materialized? In hopes that we missed something. -If a hermaphrodite got sent to a certain gender prison, which one would it get sent to? Solitary confinment -How come people tell you to stay a kid for as long as you can. Yet the moment you do anything childish or immature they tell you to grow up. Cause nobody is ever happy, and need excuses. -If marbles are not made of marble, why are they called marbles? Because of potheads. -Why when people ask you "what three things would you bring with you on a desert island?" no one ever replies, are you sure about that? -Why doesn't broccoli come in a can? Because all the ends would fall off -If mirrors need light to work, what happens if you put night vision goggles on in the dark and look at a mirror? You look like paris hilton -What shape is the sky? open.

Answer 3

Glue doesn't adhere well to smooth, glossy surfaces. It needs a little roughness to grip. That's why we sand things to rough them up before we glue, and it's also why you need special paint in order to be able to paint on plastic.
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Answer 4

Glue needs air to dry. The little air inside the bottle is saturated with glue vapors so it is not enough to dry. It won't dry because there is not enough air.

Answer 5

the only thing that harden's glue is oxygen. with the cover on no oxygen. but you'll notice is the cover is open the top of it get's harden. glue is thick it takes a long time for oxygen to mix in it. so it would take 2-3 day's for it to completely harden if the cover is left off in that time

Answer 6

Needs air to dry. The little air inside the bottle is saturated with glue vapors so it is not enough to dry.

Answer 7

The bottle is seal-tight. If you would leave the bottle open, the glue would eventually harden.

Answer 8

glue needs the air to cure it, thats why it is always stuck to the outside of the bottle

Answer 9

http://answers.yahoo.com/search/search_result;_ylt=A0WTcJlOCLlGRwoBUwfxxQt.?p=Why+doesn%27t+glue+stick+to+the+inside+of+the+glue+bottle