(Pros and cons for each polymer is in journal #3)
(Pros and cons for each polymer is in journal #3)
We wanted to make polymer that acts as the back side of the phone case, so it should be comfortable to hold and convenient to use. That’s why we want our polymer to have the following physical properties:
Low stretch – A phone case shouldn’t soft and stretchy. We can test it just by stretching it.
Firm – In order for the polymer to protect the phone. Also, no one wants to use a case that’s soft and slimy. we can test by feel if it’s firm.
Sticky (only to flat surfaces) – Our whole purpose was to make a phone case that can stick. We can test it by sticking it onto a wall, see if it’s easily attached or removed.
Not moldable – We don’t want the polymer to easily take shape, because it would be really annoying for the user to adjust it every minute if it’s blocking the charger port, camera, etc. We can test this by trying to roll it into a ball.
Not sticky to hand – We only want it to be sticky to walls and tables, because sticking on to hand would be very inconvenient for the user. We will test this by holding on to the polymer for 15 seconds, and then removing it. See if it’s easily removed, and if there are any left overs on hand.
Rubbery – This is just a optional physical property we hope our polymer would have, so it improves the grip and feel of the case.
OUR FIRST PLAN
From what I said before in Journal #2, we decided to use gloop as our base polymer, and modify it to fit our goal.
Prorotype #1: We planned to add 3g of guar gum to thicken the gloop and additionally add some rubbery properties, and 5g of PVA glue to make the gloop more sticky. (We also added 5g of borax, I think we were just being dumb. There wasn’t a reason since it decreases the stickiness) The polymer didn’t stick to anything; it was probably because of the borax we added randomly.
Prototype #2: We did the same thing except that we took out the borax. The gloop has gotten much more sticky and the grip was much more comfortable, but also, without borax to decrease the stretch, our polymer was more moldable and stretchy (we want to change that).
*We took the prototype out of the bag after a week, that’s when we were done with prototype 4. It worked really well, since some of the liquid was probably dried up through out the week, so it was sticky and thick. We stuck our phone on it and placed it on the wall, and it did stick. This was probably our best prototype yet, however, it looked bad and the grip wasn’t that good.
Prototype #3: We wanted to make the next one thicker, so we took out guar gum and put in 2g of solid corn starch which thickens the polymer. Our goal was achieved, the new polymer had very low moldability and stretch. But again, it wasn’t sticky enough.
Prototype #4: We thought the stick was decreased because it was way too thick and solid, so we 4g of water. (we added 4g of borax again, so stupid) The water made the polymer more stretchy but did nothing to the stickiness.
After Ms. Lemly came in and told us about the environmental issues of some of the materials we used, we decided to try using only the environmentally safe materials — water, guar gum, and solid corn starch.
Prototype #6: For this prototype, used 40ml of white glue, 7g of corn starch, and 3g of guar gum. With too much glue and less material to thicken the polymer, it turned out to be too sticky and watery.
Specific Goal: To design a polymer who acts as a phone case and allows it to stick to flat surfaces. It should be easily attached and removed, also, it should be very durable even when exposed to air for a long period of time.
Targeted Audience: Millennials
Problems that will be solved by this polymer: When you put your phone on the table, it can be easily pushed off by mistake. But with this sticky phone case, it will prevent these kinds of accidents. Also, this phone case allows the phone to stick onto walls, this will be a huge convenience: people get to watch tv shows without holding the phone, or even follow tutorials (like a rubix cube video) without having to hold the phone with one hand.
(an example that is too sticky for our goal)
I think gloop works best for our design out of the three basic polymers. First of all, it can stick onto flat surfaces, and is not too sticky to cause a problem. Super slime doesn’t stick at all, and stretch-tastic slime is just a pain to remove. Second of all, gloop is the hardest of the three slimes. this is very important trait for a phone case, since no one wants to hold a soft and gross case. Finally, gloop has a better grip comparing the the others; the stretch tastic slime is just disgusting and it gets all over the place, and there’s a layer of sticky liquid on the super slime, which we don’t want that on our phones.
A polymer is a substance that is composed of many simple molecules bonded together called monomers (in other words, it’s when many molecules of a simple compound joined together). A single polymer molecule might consist of hundreds to millions of monomers and may have a linear, branched, or network structure. The amount of monomers in a polymer determines the so called degree of polymerization. When there’s a large amount of monomers in a polymer, it tends to have a high degree of polymerization and it’s called a high polymer.
There are two ways a polymer can be created:
PVA Borax Polymer
PVA solution can be made into a slime by adding borax. PVA is already a polymer, and in this case, it is providing back bone for the atoms that will be joined. When they are mixed, the chains of atoms becomes linked together. As a result, the new substance becomes more solid.
2. Synthetic materials are artificial materials made from different substances through polymerization. Synthetic materials are manmade and are not produced in the wild.
Two examples of synthetic material are rayon and polyester:
“Unsafe Slime? How Bad Is Borax, Really?” The Chronicle Flask, 28 Dec. 2018, chronicleflask.com/2017/08/07/slime-safety/.
“Rayon.” How Products Are Made, www.madehow.com/Volume-1/Rayon.html.
“Polyester.” How Products Are Made, www.madehow.com/Volume-2/Polyester.html.
Encyclopædia Britannica, Encyclopædia Britannica, Inc., kids.britannica.com/students/article/polymer/276496.
24 tributes, 1 survives. In the dystopian novel The Hunger Games, Suzanne Collins flawlessly characterized the protagonist, Katniss Everdeen, as a strong and responsible individual.
Katniss, the girl who was on fire, was seen as an impulsive and lethal contestant in the eyes of the capital; however, she’s actually a motherly character who always tries her best to protect her loved ones. “‘Katniss! Katniss!’ I can hear my name being called from all sides” (Collins 71). During the opening ceremony of the Games, Katniss attracted all the attention and admiration from the audience, outshining every other tribute with her burning outfit. “Without thinking, I pull an arrow from my quiver and send it straight at the Gamemakers’ table. I hear shouts of alarm as people stumble back. The arrow skewers the apple in the pig’s mouth and pins it to the wall behind it. Everyone stares at me with disbelief” (102). It was ridiculous to shoot an arrow towards people who are going to sponsor you, but while demonstrating her amazing shooting skills, Katniss was furious and shot without considering the consequences. “’Come on, let’s eat,’ I say and plant a quick kiss on the top of her head” (16). After the death of Katniss’ father, her mother couldn’t pull herself together, so she took the responsibility to take care of the Prim. When Prim was chosen as tribute, Katniss boldly sacrificed herself to replace Prim in entering the games, “’I volunteer!’ I gasp. ‘I volunteer as tribute!’” (22).
Katniss’ position and personality reminds me of Uchiha Itachi in the series Naruto by Masashi Kishimoto. Itachi had the talent in both ninjistu and genjistu, but he was later on forced into a mission to assassinate his brother, the person he loved the most. He just couldn’t do it. In order for his brother to live, he had to exile himself from the village he lived in his entire life, and bear the charge of treason. Both characters loves their family more than anything else and would risk their lives protecting it.
Citation: “Primrose Everdeen.” The Hunger Games Wiki, thehungergames.fandom.com/wiki/Primrose_Everdeen.