Category Archives: Science

Polymer Journal Entry #4

Through a tough process, we finally created our end product – The Impeccable Glue. To reach this, we had to first brainstorm what we wanted our product to do and it’s characteristics. When we were first designing our polymer, we decided that the end product should be moldable, a bit sticky and harden overnight. We all received a sheet of paper, with the information about all the different characteristics each material contributes. I had picked corn starch because I wanted something less watery. I picked PVA solution because I wanted something sticky. Another thing I chose was liquid starch to add a little bit of liquids to the prototype. The last thing I chose was guar gum, to add a bit of elasticity to the polymer. When I was making all of the different prototypes, I realized that making a polymer with all of those characteristics was hard. I had tried a few different prototypes and had then turn out too slimy, too sticky, too bouncy. Sometimes it would be perfect; however, overnight it would harden and break.

While making the different prototypes, I learnt what ratio of ingredients I would need in order to make the polymer a certain way. I learned that too much liquid starch causes a much slimier polymer, so you need to add more PVA solution and around the same amount of corn starch to create a sticky moldable polymer. I also discovered that when making the guar gum, the water and guar gum just weren’t mixing properly so it didn’t mix in well with the polymer. So instead we would add dry guar gum straight to our polymer. It mixed way better and worked really well.

On presentation day, I learned that most polymers won’t turn out how you want them to. Sometimes something unexpected will happen and surprise you. Also you can’t always have all the characteristics you want in a polymer, sometimes you have to compromise. But overall, the experience was great and our polymer ended up doing what it was supposed to.

pastedGraphic.png

Polymer Journal Entry #3

With the final adjustments of the polymer, it is beginning to work well with our design goal. Getting to the point of the finished project was harder than expected, lots of surprises came along the way.

My first prototype was a absolute failure. The turnout was a green clear liquid that was like jelly. On the inside, there were clumps of corn starch and guar gum. On the outside, everything was very runny. Making this prototype, I first added 15 mL of liquid starch into a small cup. After that i added four drops of green food dye. Once mixed all the way through I added seven mL of PVA and then 3 grams of cornstarch. After I mixed it all together, I soon came to the conclusion that my liquid starch to PVA solution and cornstarch was completely off. I know that because when I added in the PVA, the jello wasn’t forming properly, and it ended up as much more liquid. I had also added them in the wrong order causing the clumps to form. The result was a super slimy, not very sticky, jelly substance. The results for the blob and hang test were what I was hoping for, they lasted a very long time and stayed molded. However with the bounce test, it bounced up approx. two inches off the table.

After tweaking the procedure, my second prototype was a success. This time I first added 5mL of liquid starch, then only three drops of food coloring all in a plastic cup. After that I added 10mL of PVA solution followed by 1.7 grams of cornstarch. Before I added the guar gum, the polymer was very sticky and stringy. It wasn’t the texture I was hoping for; however, after the guar gum was added, it became much more elastic. It still contained its stickiness, but it was less extreme and easily molded. With the tests, the polymer had no bounce at all, took 47 seconds in the hang test, and 1 minute and 21 seconds in the blob test. To test it out, I stuck it onto a metal water bottle, and it stayed molded without dripping for five minutes before we had to take it off

.tumblr_nz9pc0lEJO1v0kd8mo1_500

image from here

Polymer Journal Entry #2

Type of Polymer Slime Rating Slow poke Fast poke Slow pull Fast pull Blob test (seconds) Hang test (seconds) Bounce test
Oobleck 3/5 Hard exterior, Gooey interior. Hard to poke through, crumbles. Stringy, stretches out, breaks off slowly. Breaks quickly and cleanly. 5 8 Plops onto plate.
Boogers 1/5 Damp, sticky, molds to finger. Molds to finger, doesn’t stick. Super stretchy, doesn’t break off for a long distance. Breaks instantly and cleanly. 56.65 11.88 Approx. 3cm bounce.
Super Slime 2/5 Molds around finger like a cushion. Breaks through, stays molded. Stretches out approx. 6 inches before breaking. Breaks in half instantly. 58.03 18 Approx. 2cm bounce.
Gloop 1/5 Really hard to break through, stays molded to tip of finger. Doesn’t budge. Breaks at around 2ft. Breaks instantly in half. Over a minute. Over two minutes. Approx. 10cm bounce.

 

Descriptions:

Oobleck – Slime like texture, however solidifies and crumbles with pressure; doughy, sticky.

Boogers – Super sticky, opaque. Looks shiny and smooth, smells like glue.

Super Slime – Slimy, bouncy, rubbery, diaphanous blue color. Sticky and smells like glue.

Gloop – Damp, feels like rubber or silly putty. Breaks easily, is opaque, smells like paint.

 

For our project, we are making a polymer that can protect phone screens from breaking. For that, I feel as if the Super Slime’s bounciness combined with Boogers stickiness and ability to stay molded will form a great base. I also think that Gloop’s capability to stay molded and not drip everywhere was a good characteristic to include in our polymer. To test the strength of our polymer, I was thinking about doing the blob test, hang test, and the bounce test. Doing these tests on our polymer will show if it is capable to withstand being on a phone and dropped. Then to test how well it can stick and stay molded to a phone, we will put it around a broken phone that is not in use and see the results over the course of 5 minutes. Then I will take the phone home, and overnight, see how well the case molded. To test if it is safe to drop, we will put it around a glass screen protector and drop it from different heights, recording all results.

Polymer Journal #1

For the Sugru project, my group has to design a polymer to prevent objects from breaking. Since we are living in an electronic era, I thought a common object that most people have are cellphones. Now, teens tend to use mobile phones instead of landlines to communicate with each other; however, because some teens are clumsy, they are more likely to drop their phones causing them to crack. Our group decided we wanted to prevent poor phone screens from cracking through a protective case.

 

The basic structure of this case will be a small rubber that you put on the corners of your phone, overnight it will mold and stay in shape. We were hoping to create something cushy and soft, but durable. It wouldn’t be bouncy because that would cause the phone to jump all over the place. Another characteristic is that once you take it off the phone, you can mold it into another shape for all phone shapes and sizes. It won’t be like other cases because this one will provide much more support than a plain plastic case, plus it would mold to your fingers so it wouldn’t drop as much.

lloyd2

Increase in Cell Phone Usage