Why is Our Polymer Different From Previous Design?
Normal shoes are stiff and thick, so it can’t be stretched. Therefore, if people’s feet grow and their feet are not fit with shoes, they have to change their shoes. However, our polymer shoes have special abilities. If people make the shoes with our polymer, the shoes can be stretched so that people don’t need lots of shoes during their lives. Also, our polymer shoes can be stretched not only its sizes but also its shape. Consequently, the shoes will more fit with user’s feet. Our polymer shoes are also waterproof. So, people are able to use our shoes when it rains.
Describing Our Polymer
We want the Physical Properties to include:
- little elastic
- Not smelly
- solid(our polymer must not roll down when I hold it)
Our Plan to Develop our Prototype
*Prototype = sample or model
1st we will…
First try polymer– fail
First, we decide a character of our polymer and it is slippery and expansible. It is because these are fundamental features of our polymers to achieve our goals. Expansible is needed to expand, change our polymer to any size, shape and slippery is needed not to make the sticky shoes. If the shoes are sticky, people don’t want to use.
First, we try with 15ml PVA, 3ml borax, 0.5cm white glue, 10ml starch and 3ml water. According to my analysis of three polymer test(gloop, boogers, super slime), I found that a proper amount of borax and PVA’s combination makes polymer slippery and not to roll down, booger’s materials make polymer expansible and a combination of glue and water build a solid body.
Second try polymer—blue
2nd we will…
We are not able to mix with first try’s prototype completely. We can’t get a real polymer. So, we failed on the first try. But we realize something important, PVA is good for mixing materials. So, we add more PVA to mix all materials and get a polymer easily. We also add food color.
So, we plan to try an experiment with 36ml PVA, 12ml borax, 1cm glue, 13ml starch and 3ml water.
3rd we will…
We plan to add more PVA and subtract borax from the second prototype.
So, we get a prototype; 51ml PVA, 10ml borax, 1cm glue, 13ml starch and 3ml water. Fortunately, this polymer contains all character that we want. But there is one thing that we want to improve more, a degree of expansible. When I stretched it widely, it was snapped. So, I have to make it more expansible.
We need the polymer that is slippery, expansible and waterproof. To get this polymer, we plan to subtract little glue from the third recipe. It is because we realized that glue makes polymer less expansible and more sticky.
Final prototype: PVA 50ml, Borax 10ml, Glue 0.7cm and Starch 13ml. There is one big thing that we decided to change, pouring water into the polymer instead of mixing water.
Our Method for Testing our Prototype:
How we’ll test it to see if it works
||Why we chose this/How this will be effective
Stretching a polymer and compare it with a 30-cm ruler and my shoes
|The reason why I compare the polymer with my shoes and ruler:
To see how much our polymer expands.
How this will be effective:
If our polymer expands more than my shoes’ length(285cm), width and a 30-cm ruler, it is qualified for being shoes.
Result: According to NBC news, the longest feet size in the world is 16 inch, around 40cm. And our polymer was expanded much more than 30cm- ruler. As a result, my shoes can be fit for any person.
Putting an eraser inside a polymer
|Reason: To test whether our polymer is sticky or slippery
How this will be effective:
If an eraser is not attached, then our polymer is slippery but if an eraser is attached, our polymer is sticky.
The reason why I use an eraser:
The eraser consists of lots of eraser powders. So, it is attached to other more easily. So, if the eraser powders are not attached to my polymer, then my shoes can prove that it is slippery much stronger than using other materials.
Result: An eraser powder was not attached to the polymer at all. Consequently, the polymer is slippery
Putting the paper inside a polymer and pour the water into it
|Reason: To check the ability of waterproof.
How this will be effective: If the paper isn’t wet after pouring water, the polymer is waterproof.
Result: the paper was not wet at all, so our polymer is waterproof.
Sources I used: