Monthly Archives: May 2019

Polymer Journal 4

In total we made 3 prototypes. Our end product is called Eco-Dough, and will be packaged in environmentally friendly paper bags lined with wax. You can purchase it for 20 Kuai per bag or it will be shipped to manufacturers in bulk.

Prototype 1:

3 tbs cornstarch

1 tbs water

Microwaved for a total of 40 seconds on medium heat

  • Very crumbly
  • Very cracked (after the crack test where we let it out to dry)
  • Not very bouncy
  • Dried extremely fast
  • Developed a hard ‘skin’ around the clay while it dried

One strength from this prototype is the hard skin proving that it will dry to be a strong material. All other observations are properties that are not desired in the final product. Since it was crumbly and had a fast dry time,  it would not allow the user to make their own toys successfully. 

Prototype 2:

2 tbs cornstarch

1 tbs guar gum

50 ml water

Microwaved for a total of 30 seconds on light heat

  • Squishy
  • Flexible
  • Holds its shape
  • Bouncy
  • Too sticky
  • Did not crack very much during crack test

The only limitation from this prototype was that it was too sticky. If the clay is too sticky, then molding toys with it will be extremely hard. All other properties such as its flexibility and its ability to hold its shape are all properties of polymer clay and is what we are looking for.

Prototype 3:

6 tbs cornstarch

2 tbs guar gum

40 ml water

Microwaved for a total of 40 seconds on light heat

  • Squishy
  • Soft
  • Flexible
  • Holds its shape
  • Dries hard and strong

Because of prototype 2’s  limit of the clay was too sticky, we decided to add less water so it would not be as sticky but microwaving it for less so it wouldn’t be too dry. The end product was exactly what we were looking for, a clay that had all properties of polymer clay but was 100% eco-friendly and safe. We have concluded that prototype is the best prototype out of all three.

Here is the table we used to record our data

Polymer Project 3

Our polymer idea is eco-friendly and child-safe polymer clay. We would want all the properties normal polymer clay has such as the ability to hold its shape, its flexibility, softness, and that it dries hard. Our plan was to take a basic dough recipe (cornstarch + water) but to alter it to fit the properties of polymer clay.

We first started out the basic clay recipe, but it was too hard and not moldable at all. We then decided to add some guar gum to give it an elasticity that is closer to polymer clay. We tried two prototypes one with 2 parts cornstarch 1 part guar gum and one with 1 part cornstarch 2 parts guar gum. Both were either too soft or too hard.

The process we went through was testing and revising until we got the perfect consistency.

Here is the final recipe:

6 tbs cornstarch

2 tbs guar gum

40 ml water

 

  1. Take cornstarch, guar gum and water. Mix
  2. Heat using microwave (light heat) for 30 seconds with 10 minute intervals
  3. Knead until clay

 

When you mix cornstarch, guar gum and water together it forms a frosting like consistency and the water gives the cornstarch and guar gum some room to move around so they can start forming long polymer chains. When you microwave the substance, the cornstarch/guar gum polymers will grab onto each other making them stick together- thus forming the clay.

A problem we encountered is that it cracks when it dries. We used different prototypes and compared them when they dried. The last prototype cracked the least and meets all our expectations.

Here is a picture of our second clay prototype when put through the ‘crack test’ (mentioned above)

Here are pictures of our final prototype

 

Citations:

Justice, Lisa. “Corny chemistry.” Corny chemistry – Explorit Science Center. 23 May 2019 <http://www.explorit.org/news/corny-chemistry>.

Polymer Journal 2

Our goal for the Polymer Project is to create a polymer clay that is 100% eco-friendly and has the properties of polymer clay (mold ability, softness,  flexible). Our target audience are kids who are looking forwards to using their imagination and making their own toy. This clay allows you to make your own toy and is also a toy itself.

Polymer clay is the widely known and used modeling clay. Unfortunately, it contains PVC and it is extremely harmful to you and the environment. According to CBC 90% of all toys are made with plastic. With our polymer clay (made of cornstarch, guar gum and water) it is 100% environment friendly and also 100% safe for little kids.

We use cornstarch and water to make the dough- the base. We added guar gum to give it a bouncy, stretchy and soft texture and to keep the clay from drying too fast.

 

Heres our second prototype for our eco-friendly clay

 

Citations:

“What’s So Bad About Vinyl Plastic (PVC)?” Eco, 24 Sept. 2013, www.eco-novice.com/2013/09/whats-so-bad-about-vinyl-plastic-pvc.html.

“’Wasted’: Greening the Plastics-Heavy Toy Industry | CBC Radio.” CBCnews, CBC/Radio Canada, 5 Jan. 2018, www.cbc.ca/radio/day6/episode-371-iran-nuclear-deal-plastic-toy-waste-kaepernick-bitcoin-bunkers-spotify-vs-composers-and-more-1.4470486/wasted-greening-the-plastics-heavy-toy-industry-1.4470526.

Todd Hewitt : Characterization

Paragraph A:

In the book The Knife of Never Letting Go by Patrick Ness, Todd Hewitt is constantly running away from death and chasing after the truth. Todd’s characterization slowly changes throughout the story. The main character is from Prentiss town, a place where everyone could read each other’s minds. A place where people become crazy when the noise gets too much.

 

Paragraph B:

 Todd may seem like the hero of the story but he surely does not want to be. On page 47 Todd exclaims “No, its not all right. It’s not all right at all.” Todd refuses to leave when Ben and Cillian rush him out of the town purely for his own good. There’s a fighter in Todd but there’s also a softer, kinder side. Almost everybody who meets him knows he isn’t a killer. Even in the fight for his life, Todd didn’t have the guts to kill Aaron- the pastor that wants to kill him. Todd is surely “The boy who can’t kill” (p. 451). In the beginning of the story, when Hewitt finds the hole (Viola) he helped her survive. Viola later becomes a great help and they face the Prentiss town together as one. Todd was brought up with a kind family, Ben and Cillian. After his mother was killed Ben took him in and raised him. Todd has a strong bond with these two people and depends on them mentally throughout the whole story. Lastly, “…if yer the last boy in town, you just have to wait…” (p. 10). Todd is the last boy to become a man (turning 13 years old) and he has prominent cheekbones.