The peculiar irony of the Pear- Capstone documentary

I used the Chinese characters “梨·离” because the Chinese word for pear is identical to the word for separation in terms of pronunciation. It relates to my theme, and my english title was also quite good.

I think that I have done well in terms of filming. Even though the process was quite long, about three hours of child disruption and chunky expressions from the actors, the shots were well placed, and personally, I think that my camera angles were very unique and has emotional context.

For example, the shot where the boy is running through the ivy-covered dome, features patches of light. The boy passes one patch before tying his shoe laces. I believe that my contrast of colors work very well, with the boy wearing a bright yellow shirt and gray pants contrasting with the green of the vines.

It has many silent shots, or shots with a dark screen, which references to the dark tone I set for my video.

All in all, my days of burning my midnight oil were not wasted and I am relieved to have finished it in time.

Polymer journal 5

 

I believe that prototype 7 was the most successful.

We wanted a product that could become a personal, moldable, reusable, environmentally friendly bicycle handle.

We tested it for hardness, stickiness and time taken to flatten. It was given 3/5 for hardness, 1.5/5 for stickiness, and 4/5 for time taken to flatten.

Other less successful tests include test 3, which is given 2/5 for hardness, 0/5 for stickiness, and 2/5 for time taken to flatten. And test 4, with a hardness of 3/5, a stickiness of 5/5 and 3/5 for time taken to flatten.

Based on our ideal product, we set an ideal score of about 2-3/5 for hardness, 0-1 for stickiness, 3-4/5 for time taken to flatten.

Our polymer is also a natural polymer, because it is made up of natural materials like rubber, starch and water. Oobleck is a suspension, which is a mix between a solution and a precipate. It usually settles after time making it different from a precipate, and the solute does not exist as a solid, and solvent and solute are homogeneously mixed, making it different from a solution.

Thus, the most suitable prototype is polymer 7, since it fits the ideal product’s description the best. Even though test 4 is as hard and takes about the same time to flatten, it is too sticky. Test 3 is too crumbly, meaning it is not moldable, so even if it is the right hardness and stickiness, it’s too quick to flatten.

Design process

Product pitch to dream on team

powerpoint:

script:

(first page)

Haozhe:

 

Good afternoon teachers and friends, today my teammates, Jisu, Shelly and I are going to present you our polymer product, Oobike.

 

(second page)

Jisu:

So first, what are polymers?

Polymers are large molecules that is made of a chain of smaller molecules (called Monomers) that are joined together by covalent bonds. Monomer chains can be linear (one straight line), branched (one line with smaller lines extending in other directions), and cross-linked (lines with other lines linking them)

(Third page)

 Shelly:

 

Our goal is to make a bicycle hand grip that can be easily molded to fit the needs of different hands, making it much more comfortable. We have found that people who ride shared bicycles often dislike the handgrip, since it had been used by other people, and thus, is quite dirty. They also dislike it because of the uncomfortable grip, so, by using Oobike, we can easily prevent these problems.

 

(Fourth page)

Haozhe: Oobike was made in 3 steps

Measure 20 grams of corn starch, 15 ml of water, and 0.5 grams of guar gum.

Add the ingredients to the mixture

Stir until the mixture is consistent

And then oobike is ready!

 

And because the in

(Fifth page)

Jisu:

 

The properties of Oobike is that when pressured, it becomes harder, and when pressure is released, it becomes softer. It has these characteristics because it is a non-Newtonian fluid and does not follow newton’s law of viscosity.

 

This is suitable for our goal because people can easily mold it before use, and it can be taken on and off easily. It is reusable, environmentally friendly, due to it being made out of guar gum, starch and water, which are all natural materials.

 

(sixth page)

Shelly: Our target audiences are

  1. People who uses shared bicycles
  1. People that dislike their bicycle
  2. People who wants their own bicycle grip

Lastly, People that feels the original grip uncomfortable.

 

(seventh page)

Haozhe: This is a video of our designed product Oobike made by Haozhe, hope you enjoy.

 

(eighth page)

Haozhe: The funds will be used for designing and manufacturing environmentally friendly package, improve the smell of Oobike, and for an anti-drying agent that would stop the polymer from drying after some time

 

(9,10,11th page)

Jisu:

These are the citations

 

(12th page)

All:

Thank you

 

Personally, I think that our product pitch was quite successful. It was presented fluidly, and the judges seemed interested in our product. We presented truthfully, not covering up our product’s weaknesses, and instead using it as an idea for improvement.

I also managed to make a more infomercial feeling second infomercial. I managed to balance my time for capstone and science, making our video less funny, but still interesting while promoting our product and how to use it well.

sustainability:

Our product is very sustainable. It is reusable, only dries out after about 30 minutes, and can be applied a little water to be reused.

It is made out of mainly corn starch, which is made out of corn kernels, so it is very natural and environmentally friendly.Other ingredients are guar gum and water. They are also natural, so our product is sustainable.

Citations:

“Suspension (Chemistry).” Wikipedia, Wikimedia Foundation, 4 June 2019, en.wikipedia.org/wiki/Suspension_(chemistry).

“The Search Engine That Plants Trees.” Ecosia, www.ecosia.org/images?q=corn kernal#id=D9722EB71143C66211824ECD1A95AB454576998D.

“What Is Thermoplastic Rubber? (TPR).” KMA SA Marketing, 5 Sept. 2017, www.kmasa.co.za/thermoplastic-rubber-tpr/.

Polymer journal 4

The prototypes will be rated based on:

  1. Hardness
    1. Can be tested by the difficulty of making a dent on it from dropping identical objects from slowly increasing height
  2. stickiness
    1. Can be tested by slowly poking a finger into the product and trying to extract it from the dent
  3. Blob test
    1. Tested by rolling the product into a ball

 

Desired Characteristics:

  • Moldable
  • Not sticky to slightly sticky
  • Does not flatten when rolled into a ball easily
  • Not smelly
  • Environmentally friendly

 

  • Test 1

10 grams of corn starch

5 ml of water

 

properties: 

-slightly hard, 2/5

-not sticky at all 0/5

– flattens very quickly, 1/5

– becomes a liquid almost right after pressure is applied

– Environmentally friendly

 

  • TEST 2:

20 grams of solid corn starch

15 ml of water

 

Properties

-Slightly harder than test , 2.5/5

-not sticky 0/5

-flattens slower than test 1, 3/5

– becomes a liquid quite quickly after pressure is applied

– Environmentally friendly

 

  • Test 3:

20 grams of corn starch

10 ml of water

 

Properties:

-Very crumbly, so not very hard, 2/5

-not sticky 0/5

-flattens faster than test 2 due to it being crumbly, 2/5

– Environmentally friendly

 

  • Test 4

20 grams of corn starch

25 ml of water

5 grams guar gum

 

Properties:

-not very hard 3/5

-Too sticky 5/5

-flattens 3/5

– Maintains properties of oobleck, but thick and of finer consistency

-has a bad smell which gets worse after time

-the outer layers dry out fairly quickly

-if left for more than half a day, whether in a sealed bag or the outside, it will stop being a solution and returns to an oobleck state.

– Environmentally friendly

 

  • Test 5

20grams of corn starch

0.5 grams of guar gum

15ml of water

 

Properties:

-not very hard 3/5

-slightly sticky 2/5

-flattens slightly slowly 3.5/5

-Does not become liquidly that easily

-has a bad smell which gets worse after time

– Maintains properties of oobleck, but thick and of finer consistency

-the outer layers dry out fairly quickly

-if left for more than half a day, whether in a sealed bag or the outside, it will stop being a solution and returns to an oobleck state.

– Environmentally friendly

 

  • Test 6

20grams of corn starch

0.5 grams of guar gum

15ml of water

 

Properties:

-not very hard 2/5

-slightly sticky 2.5/5

-flattens slightly slowly 3/5

-Does not become liquidly that easily

-has a bad smell which gets worse after time

– Maintains properties of oobleck, but thick and of finer consistency

-the outer layers dry out fairly quickly

-if left for more than half a day, whether in a sealed bag or the outside, it will stop being a solution and returns to an oobleck state.

– Environmentally friendly

 

  • Test 7

20grams of corn starch

1 grams of guar gum

15ml of water

 

 Properties:

-not very hard 3/5

-slightly sticky 1.5/5

-flattens slowly 4/5

-Does not become liquidly that easily

-has a bad smell which gets worse after time

– Maintains properties of oobleck, but thick and of finer consistency

-the outer layers dry out fairly quickly

-if left for more than half a day, whether in a sealed bag or the outside, it will stop being a solution and returns to an oobleck state.

– Environmentally friendly

Polymer journal 3

Desired Characteristics for Bicycle handle grip product:

  • slightly sticky
  • hard
  • moldable
  • Best to be made from natural materials such as starch, guar gum, water, baking soda, and Borax.

Characteristics of available materials:

  • Starch

When mixed with a fluid, cornstarch can rearrange itself into a non-Newtonian fluid. For example, adding water transforms cornstarch into a material commonly known as Oobleck.

It is a thickening product and thus makes things less sticky.

  • Guar gum

Used for thickening and stabilizing products

economical, since it has almost eight times the water-thickening ability of other agents (eg: cornstarch), only a small quantity is needed for producing sufficient viscosity. Because less is required, costs are reduced.

In addition to guar gum’s effects on viscosity, its high ability to flow, or deform, gives it favorable rheological properties. It forms breakable gels when cross-linked with boron. It is used as a stabilizer to help prevent solid particles from settling and/or separating.

It also slows mass transfer across the solid/liquid interface useful for making thick pastes without forming a gel, and for keeping water bound.

  • Borax

Can be used as a preservative, borax imparts a firm, rubbery texture, thus decreasing the stickiness.

However,  borax, sodium tetraborate decahydrate, is slightly toxic. Conditions defined as “over-exposure” to borax dust can cause respiratory irritation.

  • PVA

Can be made to be a ‘tack’ for precipitates or toys, such as Slime and Flubber. PVAc emulsions are used as adhesives for porous materials. When added to solutions, makes products less crumbly and less “stringy”, forming blobs.

However, it is made from crude oil, and can produce greenhouse gasses, making it environmentally unfriendly

  • Baking soda

It cause a foaming action (gas bubbles of CO2) and can neutralize acids and bases.

Our Plan:

  1. Find an polymer out of the 4 basic polymer products that is the closest to our ideal product
    1. Gloop is not moldable enough
    2. Boogers/Stretch tastic is not environmentally friendly
    3. Super slime is not environmentally friendly
    4. Oobleck is environmentally friendly, becomes solid when pressure is applied and a liquid at its normal state.
  2. After choosing Oobleck, we need to modify it to suit our needs. We need to lengthen the time taken for it to return to liquid state and thus, we need to increase the starch to water ratio.
  3. However, we need to increase its mold-ability by thickening it, and with the available polymers,
    1. PVA glue is not environmentally friendly but might be suitable
    2. borax is not very healthy for long-term contact, and might not be suitable
    3. Guar gum is environmentally friendly and the most suitable for our product
    4. Baking soda is not suitable for our product
  4. Then, we would need to test our product with some tests
    1. Hardness rating
      1. should be higher than 3 out of 5 but still moldable
      2. Can be tested by the difficulty of making a dent on it from dropping identical objects from slowly increasing height
    2. stickiness test
      1. It should be slightly sticky
      2. Can be tested by slowly poking a finger into the product and trying to extract it from the dent
    3. Blob test
      1. The blob should take a long time to flatten
      2. Tested by rolling the product into a ball

Citations:

“Borax.” Wikipedia, Wikimedia Foundation, 1 May 2019, en.wikipedia.org/wiki/Borax.

“Bike Grips.” Amazon, Amazon, www.amazon.com/bike-grips/b?node=3494261.

“Corn Starch.” Wikipedia, Wikimedia Foundation, 7 May 2019, en.wikipedia.org/wiki/Corn_starch.

“Polyvinyl Acetate.” Wikipedia, Wikimedia Foundation, 18 May 2019, en.wikipedia.org/wiki/Polyvinyl_acetate.

“Guar Gum.” Wikipedia, Wikimedia Foundation, 20 May 2019, en.wikipedia.org/wiki/Guar_gum.

“Sodium Bicarbonate.” Wikipedia, Wikimedia Foundation, 18 May 2019, en.wikipedia.org/wiki/Sodium_bicarbonate.

“The Search Engine That Plants Trees.” Ecosia, www.ecosia.org/images?q=oobleck#id=8F2AA84DDAB1943AB32B197D3904C23DFB2049B6.