Our group was: Haley Ciccone, Holden Long, and Keara Burke
This is the lab sheet our group put together.
Problem: How does the tacky glue change the physical and chemical properties of the polymer?
Hypothesis: When the white Elmers glue (polyvinyl acetate) is replaced with tacky glue, the resulting polymer will be stretchier.
Background Info: Tacky glue is thicker than normal white glue. It dries faster and is a stronger adhesive. Tacky glue is also a PVA substance, meaning it must be kept from freezing. Otherwise it will become extremely stiff and become hard to move. When dehydrated, it
Title: Tacky Glue Polymer
Problem: How does the tacky glue change the physical and chemical properties of the polymer?
Hypothesis: When the white Elmers glue (polyvinyl acetate) is replaced with tacky glue, the resulting polymer will be stretchier.
Background Info: Tacky glue is thicker than normal white glue. It dries faster and is a stronger adhesive. Tacky glue is also a PVA substance, meaning it must be kept from freezing. Otherwise it will become extremely stiff and become hard to move. When dehydrated, it
will peel off of glass, metal, and plastic.
Materials:
- Tacky glue - polyvinyl acetate
- Plastic spoon
- 200 or 250 mL beaker (Pyrex)
- 500 mL beaker (Pyrex)
- Stirring rod
- Graduated cylinder
- 525 mL of water
- 2 tsp of borax (hydrated sodium borate)
- cm ruler
- Square of paper towels (or any absorbing material used for cleaning)
- Refrigerator (with an average temperature of 1.7- 3.3 degrees Celsius
1. Arrange the materials at the head or front of a flat surface.
2. Add 400 ml of water to the larger beaker.
3. Add 2 tsp. of borax to water and stir until dissolved.
4. Pour 40 mL of tacky glue into small beaker.
5. Add 5 mL of water to the adhesive.
7. Clean the stirring rod.
8. Stir the borax compound.
9. Blend the glue and water for about 30-60 seconds, or until fully integrated.
11. Calculate 25 mL of the Borax solution that was just stirred with the graduated cylinder.
12. Deposit the solvent matter into the small beaker.
13. Coalesce the two elements, both solvent and solute, with the stirring rod.
14. Examine its features and record any results.
15. If needed, test the rebound and flexibility of the polymer just before cleaning the materials.
Stretchy Test Procedures: One ruler and a flat surface (preferably a level table) is needed to perform this experiment. After the polymer has successfully been formed, and is set to a comfortable, pliable room temperature, the trial(s) may commence. Align the ruler with the edge of the table; have the side with the centimeters facing the edge. Mold the sticky substance into an oval shape. Firmly grasp the polymer with both hands, leaving about one to two centimeters of material between fists. Stretch the matter at a controlled pace so to be sure that observations are able to be recorded, as well as allowing the polymer to adjust to the change in physical properties. How do you know when to stop stretching? When the link between the two wedges disperse in thin filaments, or the bridge suddenly splits, then it is a definite sign to halt the operation and record significant data. Depending on the fiber being tested, another ruler may need to be added to the materials in order to document accurate measurements. However, this is just in case the polymer spreads wider than originally expected (30 cm). Also, this test will need to be reiterated two to three more times in order to regulate an average calculation of its break-point. Compare and contrast with previous test results, as well as separate experiments.
Stretchy Test Procedures: One ruler and a flat surface (preferably a level table) is needed to perform this experiment. After the polymer has successfully been formed, and is set to a comfortable, pliable room temperature, the trial(s) may commence. Align the ruler with the edge of the table; have the side with the centimeters facing the edge. Mold the sticky substance into an oval shape. Firmly grasp the polymer with both hands, leaving about one to two centimeters of material between fists. Stretch the matter at a controlled pace so to be sure that observations are able to be recorded, as well as allowing the polymer to adjust to the change in physical properties. How do you know when to stop stretching? When the link between the two wedges disperse in thin filaments, or the bridge suddenly splits, then it is a definite sign to halt the operation and record significant data. Depending on the fiber being tested, another ruler may need to be added to the materials in order to document accurate measurements. However, this is just in case the polymer spreads wider than originally expected (30 cm). Also, this test will need to be reiterated two to three more times in order to regulate an average calculation of its break-point. Compare and contrast with previous test results, as well as separate experiments.
Results:
When we tested the flexibility of the tacky glue polymer, it stretched to 18 cm. We tested the flexibility again after putting the polymer in the fridge. It was able to stretch up to 59 cm. We also tested the rebound. At room temperature, the polymer's rebound was between 8-11. After being cooled, the polymer's rebound was 13.
We found that a different type of glue was enough to change the physical properties of the polymer: for instance, it resulted in much higher flexibility. Our hypothesis was proven correct.
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