Plastic Deformation: Glass Transition of Some Plastics

Areas of Science	Chemistry
Difficulty
Time Required	Average (6-10 days)
Safety	Adult supervision required for experiments using boiling water.

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Abstract

Some plastics undergo an unusual transition, from a hard, glassy state to a soft, rubbery state, with increased temperature. For this project, you should do background research on the effects of temperature on different types of plastics. Make sure that you understand the difference between thermosetting and thermoplastic polymers. You should also look for information on the glass transition temperature (T_g) for different plastics. Pure polyvinyl acetate has a T_g of 28 C (about 82 F). You can make a sample of this polymer by pouring some Elmer's Glue-All into a plastic bowl or plate and allowing it to evaporate for several days. Cut strips of the resulting material for your experiments. Try dipping the strip into warm water and immediately wrap it around a pen or pencil to make a spiral. Dip it in ice water. Describe the properties of the polymer at the two temperatures. What happens if the spiral is reheated? Additives in the glue may shift the T_g away from that of pure polyvinyl acetate. Use water heated to different temperatures to determine the T_g for your polymer. Other plastics, such as polystyrene (recycling code #6), have higher T_g's. With an adult's help, you can investigate these materials using boiling water. (To raise the temperature of boiling water slightly higher, add a few tablespoons of salt. Search on "colligative properties" to find out how this works.) (Goodstein, 2004, 105-109)

Bibliography

Goodstein, M., 2004. Plastics and Polymers Science Fair Projects: Using Hair Gel, Soda Bottles, and Slimy Stuff. Berkeley Heights, NJ: Enslow Publishers.

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MLA Style

Science Buddies Staff. "Plastic Deformation: Glass Transition of Some Plastics." Science Buddies, 28 July 2017, https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p034/chemistry/plastic-deformation-glass-transition-of-some-plastics. Accessed 6 Apr. 2020.

APA Style

Science Buddies Staff. (2017, July 28). Plastic Deformation: Glass Transition of Some Plastics. Retrieved from https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p034/chemistry/plastic-deformation-glass-transition-of-some-plastics

Last edit date: 2017-07-28

Experimental Procedure

For this science project you will need to develop your own experimental procedure. Use the information in the summary tab as a starting place. If you would like to discuss your ideas or need help troubleshooting, use the Ask An Expert forum. Our Experts won't do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions.

If you want a Project Idea with full instructions, please pick one without an asterisk (*) at the end of the title.

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Plastic Deformation: Glass Transition of Some Plastics *

Abstract

Bibliography