4. Discussion


4.1 Key findings


From this data we can conclude that glue, when applied at a higher temperature, has greater adhesive strength than glue when applied at lower temperatures. According to our results, the optimal temperature for glue to be applied for maximum adhesive strength is 100 degrees Celsius, however we did not test above 100 degrees Celsius as we were unsure whether it would be safe.

Unsafe
Link : http://www.safetysign.com/images/catlog/product/large/D3927.png



Key Observations:


When we heat glue, big bubbles are formed at the surface of the glue and smaller bubble are formed inside the glue. Some clumps of glue will be formed but the glue will be of a lesser viscosity than its original state at 25 ℃.  This may be due to the particles inside the glue moving faster after being heated. 

This may be another possibility for the glue to have greater adhesive strength at higher temperatures during a short period of time. The particles of glue would settle down in the crevice of the wood faster and hence will dry faster. 

For example, if you take a classroom with 25 seats and make 35 people run inside the classroom, the classroom would fill up and settle down faster as compared to making 35 people stroll in instead.


On the other hand, when you cool down glue, there are no bubbles found either at the surface or inside the glue. No clumps of glue will be formed but the viscosity of the glue will be higher as compared to its original state of 25 ℃.  This may be due to the particles inside the glue moving slower.

This will be a benefit if given a longer period of time to dry as the glue will settle down in the crevice of wood more evenly and will have stronger cohesive adhesive bonds.




4.2 Analysis of data


We decided to plot our points to see the trend.
The higher the temperature of the glue, the more number of weights it can take.

When the glue is at 75℃ and 100℃ it can take the highest amount of weight(200g) before sagging. This suggests that this is the optimal range to apply glue at.

When the glue was at 50℃ it could take up to (150g)

When the glue was at the temperature of 0℃ and 25℃ it could only take 100g before sagging. This suggests that this was the least optimal range to apply glue at.

As the data contradicts our expectations, we can conclude that this may have been because the glue was able to cure better at higher temperatures (this is one of the properties of a brand of glue called Gorilla Glue). It is also possible that the choice of material used affected this as glue of higher temperatures appear to work well with wood, but perhaps not other materials.


Gorilla Glue
Link : http://www.swifco-ep.com/images/gorilla_glue.png



4.3 Evaluation of Hypothesis


We proved our hypothesis to be incorrect in an environment where glue was given 5 minutes to settle down. However, we were unable to prove whether the hypothesis is correct given a different amount of time for the glue to settle down.
Incorrect
Link: https://cdn3.iconfinder.com/data/icons/simple-web-navigation/165/cross-256.png

4.4 Areas for improvement

We originally had another completely different project which failed because it was impossible to complete the setup with the proper wiring (we were testing for the optimal frequency to transmit sound waves for mobile phone calls, then we could not acquire the proper wiring and we had incompatible ports with the oscilloscope, thus we decided to abandon that project and start a new one for resubmission). Given more time we could have explored more variables that would impact this extensively, such as the type of glue being used, the type of material being used and time provided for the glue to dry. We could also have tried using weights of different mass to get more precise results.

Areas for Improvement
Link : http://cdn.xl.thumbs.canstockphoto.com/canstock9530467.jpg

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