Bioplastics: Effective or Just Efficient? Grace Desjardins.
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Transcript of Bioplastics: Effective or Just Efficient? Grace Desjardins.
Bioplastics: Effective or Just Efficient?Grace Desjardins
ProblemHow can bioplastics be easily made?Can bioplastics function as well as oil-based
plastics or even plastics made partially from recycled materials?
Research Plastics are polymers. The production of bioplastics uses agro-polymers, such
as starch.◦ Break down the starch into a paste by adding heat and water ◦ The materials used affect the plasticizers.
Bacteria-based Plant-based
Problems with Bioplastics:◦ price of production◦ health complications ◦ some don’t react well to heat
Benefits of Bioplastics:◦ biodegradable◦ eco-friendly production
less energy is used, thus less use of fossil fuels
◦ can use the same machinery as oil-based plastics
Hypothesis If multiple aspects of oil-based plastics and
bioplastics are tested, then oil-based plastics will prove the most applicable to everyday lifestyle.
Required Materials
Glycerin Corn starch Vinegar Water Soap-making Molds Aluminum foil Cooking spoon Hot Plate Vernier Dual-Range Force
Sensor Weights (in this case,
batteries) Scale 100 mL beaker 400 mL beaker 10 mL graduated cylinder
Calculator Medicine dropper Computer Goggles Spatula Lab apron Pole Basket with attachment Clamp Bioplastic bag oil-based plastic bag Plastic bag made partially from
recycled materials Tape
Procedure (Phase 1) Place a plastic cup on a balance and zero it. Add cornstarch to
the plastic cup until reaching 10.00 g. Add this to the 400 mL beaker.
Measure 60 mL of distilled water out in a 100 mL beaker. Add this to the 400 mL beaker.
Measure 5 mL of glycerin and 5 mL of vinegar using a 10 mL graduated cylinder and add to the 400 mL beaker.
The 400 mL beaker and its contents were placed on a hot plate and stirred with a stirring rod.
Once the substance becomes clear, thick, and slightly bubbling, pour it into the molds.
Leave the bioplastic to dry for approximately 24 hours before removal from the molds. Upon removal, place the samples on aluminum foil.
Procedure (Phase 2) Cut samples from plastic bags (one oil-based, one bioplastic,
and one made partially from recycled materials) in dog bone shapes and draw two lines in marker a distance of 5 cm apart on each sample. Five samples were used from each bag.
Set up the Vernier Dual-Range Force Sensor using a pole and two supports of the same height. To ensure its security, the pole was taped to the supports.
Connect the device to a computer, on which the Logger Lite 1.5 program had previously been installed.
For each of the fifteen trials, add a clamp to the force sensor to hold the plastic, which should be clipped after the system has been zeroed.
When the plastic sample is hanging from the force sensor, add a clamp to the bottom of it. Attached to the clamp should be a chain which holds a basket, which should have been weighed.
Measure objects of uniform mass and place them in the basket. With every addition of mass, measure the distance between the
marker lines previously drawn on the plastic samples. Record the force calculated on the Logger Lite 1.5 program.
Continue until the plastic sample can no longer hold the basket and its contents.
VariablesControlIndependent
◦ The plastic samples: bioplastic, oil-based plastic, and plastic made partially from recycled materials
Dependent◦ The tensile strength and tensile strain of the
plasticsConstants
◦ Vernier Dual-Range Force Sensor◦ Basket and attachment◦ Batteries◦ Computer◦ Balance ◦ Template for cutting samples
Data: Graph 1
0
0.5
1
1.5
2
2.5
Force (in Newtons) Applied to Plastics
Type AType BType C
Plastic Type
Forc
e (
N)
Data: Graph 2
0
5
10
15
20
25
30
35
Avg. Force Per Gram
Type AType BType C
Plastic Type
Forc
e (
in N
ew
tons)
Data: Graph 3
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
Avg. Stretch of Plastic Types
Type AType BType C
Plastic Type
Str
etc
h o
f P
lasti
c (
in c
m)
Data: Graph 4
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Young's Modulus: Stress and Strain
Type AType BType C
Plastic Type
Str
ess o
ver
Str
ain
Data Summary Average Tensile Strain:
◦ Oil-based plastics : 2.1460 N
◦ Bioplastics:1.4276 N
◦ Plastic made partially from recycled materials: 1.3396 N
Average Tensile Stretch:◦ Oil-based plastic: 0.18 cm
◦ Bioplastic: 0.11 cm
◦ Plastic made partially from recycled materials: 0.04 cm
Average Force Per Gram◦ Oil-based plastics: 29 N
◦ Bioplastic:23 N
◦ Plastic made partially from recycled materials: 23 N
T-tests◦ Type A was significantly stronger than both Type B and Type C
There was no notable difference in strength between Type B and Type C.
◦ In terms of elasticity, Type A stretched more than Type C according to T-tests. Type B was not remarkably different from Type A or Type C.
Conclusion
Hypothesis: “If multiple aspects of oil-based plastics and bioplastics are tested, then oil-based plastics will prove the most applicable to everyday lifestyle.”
The hypothesis was partially rejected because although the oil-based plastic was the strongest, it did stretch more than the plastic that contained recycled materials.◦ In regards to strength, the oil-based plastic most likely has stronger
bonds which enable it to tolerate more force than the bioplastic and the plastic made partially from recycled materials can.
◦ It is possible that the plasticizers in both the oil-based plastic and the bioplastic enable both types to stretch the same amount. The plasticizers in plastic made partially from recycled materials probably allow the plastic endure more in terms of elasticity.
In regards to Phase One, it could have been unsuccessful for a variety of reasons:◦ Uneven spreading of ingredients
◦ Ingredients were not compatible
◦ Heating process
Conclusion (cont.) What Could Have Gone Wrong
◦ Accuracy of measurements◦ Transfer of ingredients◦ Changing numbers on the balance and Logger Lite 1.5 program ◦ The way in which the Vernier Dual-Range force Sensor hung
Improvements◦ Phase One could be continued until a successful bioplastic was
created. ◦ Phase Two could be continued by testing more samples of the
three plastics or adding additional types of plastics.◦ More qualities of the plastics could be tested. ◦ Smaller increments of mass could be added to achieve more
accurate results. Advancements
◦ How can a better homemade bioplastic be created?◦ Might there be a way by which one can keep the samples
uniform? ◦ How quickly can the homemade bioplastic deteriorate?◦ if bioplastics were mass-produced, how would this affect the
economy?
References 4-H, Horton, R. L., PhD., Warkentien, C., & Gogolski, J. (n.d.). Agriculture
at Work: bioplastic. Retrieved September/ October, 2011, from 4-H website: http://www.4-h.org/ agriscience/
Archana, T., & Preeti, C. (2011, November 17). Integration of natural and Biological sources for the Production of Biopolymer: Actual and Potential Utilization of various Wastes. Journal of Pharmacy Research, 4(1), 53-55. Retrieved from http://jpronline.info/ article/ view/ 5579/ 2933
Averous, L., Pr. (2007, June). Bioplastics: Agro-polymers and Starch-based biomaterials (Plasticized or Thermoplastic Starch-based materials). Retrieved October 10, 2011, from http://www.biodeg.net/ biomaterial.html
Bioplastics: Uses and Applications. (2009, October 28). Energy Business Daily. Retrieved from http://energybusinessdaily.com/ renewables/ bioplastics-uses-and-applications/
Bortner, L., Dr. (2011, February 15). Young's Modulus. Retrieved November 14, 2011, from http://www.physics.uc.edu/~bortner/labs/Physics%201%20experiments/Youngs%20Modulus/Youngs%20Modulus%20htm.htm
Bourg, V., Berthe, V., & Chivrac, F. (2011, August 4). Overview of the use of bioplastics in packaging [Web log post]. Retrieved from Bioplstic innovation: http://bioplastic-innovation.com/ 2011/ 08/ 04/ bioplastics-in-packaging/
References (cont.) Dictionary.com Unabridged. (2012). Retrieved January, 2012, from
Dictionary.com, LLC website: http://dictionary.reference.com/ Freudenrich, C., Ph.D. (1998-2011). Making Plastics. Retrieved
October 10, 2011, from HowStuffWorks, Inc website: http://science.howstuffworks.com/ plastic5.htm
Statistics in Biology. (n.d.). Retrieved February 15, 2012, from http://www.usciences.edu/biology/bs130/statistics%20for%20biology-t%20test.html
Theinsathid, P., Chandrachai, A., & Keeratipibul, S. (2009). Managing Bioplastics Business Innovation in Start Up Phase. Journal of Technology Management & Innovation, 4(1), 84, 86-88. Retrieved from http://www.jotmi.org/ index.php/ GT/ article/ view/ art106/ 476
Vernier. (2007, March 24). Dual-Range Force Sensor [Pamphlet]. Retrieved from http://www.vernier-iberica.com/ descargas/ datos%20tecnicos/ dfs-bta.pdf
What Is Polymer Resin? (2003-2011). Retrieved October 15, 2011, from wiseGEEK website: http://www.wisegeek.com/ what-is-polymer-resin.htm
Wilbraham, A. C., Staley, D. D., Matta, M. S., & Waterman, E. L. (2008). 23.4 Polymerization. In Chemistry (pp. 747-752). Boston, Massachusetts: Pearson Prentice Hall.
Woodford, C. (2011, October 3). Bioplastics and biodegradable plastics: Explain that Stuff! Retrieved from http://www.explainthatstuff.com/ bioplastics.html