how does the tempeture effect the strentgh of glue?

Question

ITS 4 SCIENCE FAIR I NEED THIS ITS VERY IMPORTANT

Answer 1

Depends on the glue.

Some glues won't work in cold temperatures.

Some glues won't work in hot temperatures.

Superglue works because it rearranges molecular structure of two items and fuses them together.

You need to go on a search engine and thoroughly investigate this if it's for a science fair. I hope you didn't wait until the last minute, this will take at least two weeks to answer unless you can speed read and take copius notes quickly. Then you'll need to do some mock-ups of actual experiementation.

Answer 2

This is a good question and the answer is not simple if you want to understand all of the details. You could do a PhD thesis on this topic. All that I will provide here is an outline.

In general, glues are made with long stringy molecules. The molecular conformation is random coil, which is entropically favourable. The random coils interpenetrate. The strength of the glue is directly related to the energy required for molecules to slide past one another. A thermally activated process called reptation allows molecules to explore the configuration space to find a path to untangle. The rate of reptation increases with temperature and the presence of a solvent. The rate of deformation is limited by the reptation rate. If glue is to be deformed faster than the reptation rate, scission , the breaking of molecular bonds, occurs. Scission requires more energy than reptation and is essentially independent of temperature. The full mathematical treatment of reptation is rather complex. Refer to papers by Robin Ball if you want to learn more.

The foregoing presumed stability of the glue molecules. In all real cases, glue molecules are subject to chemical reactions that break down the molecular structure, resulting in smaller molecules. Oxidation is an important process and many glues contain anti-oxidants to slow the process down. The rate of degradation is thermally activated, so a glue will degrade faster at a high temperature than at a lower temperature.

Answer 3

I watched a show on tv last night where someone used super glue in the engine of a race car and the heat from the engine melted the glue.