Effect of uv light on standard plastic and bio plastic bags
This presentation is the property of its rightful owner.
Sponsored Links
1 / 23

Effect of UV Light on Standard Plastic and Bio-Plastic Bags PowerPoint PPT Presentation


  • 64 Views
  • Uploaded on
  • Presentation posted in: General

Effect of UV Light on Standard Plastic and Bio-Plastic Bags. By: Anthony Disbrow, and Tyler Ista ENG 45 SRJC 12/13/06. Factors. Reflection Ambient temperature Humidity Impurities. Effects. Any UV radiation can cause photochemical effect within polymers.

Download Presentation

Effect of UV Light on Standard Plastic and Bio-Plastic Bags

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Effect of uv light on standard plastic and bio plastic bags

Effect of UV Light on Standard Plastic and Bio-Plastic Bags

By: Anthony Disbrow, and Tyler Ista

ENG 45

SRJC

12/13/06


Factors

Factors

  • Reflection

  • Ambient temperature

  • Humidity

  • Impurities


Effects

Effects

  • Any UV radiation can cause photochemical effect within polymers.

  • This effect can be either a benefit, or a detriment.

  • With respect to plastics, UVC is more likely to have an effect.

  • Surface of plastics may undergo a color shift, appear chalky, or become brittle.


Effects continued

Effects Continued

  • Certain polymer systems are able to be cured under UV light at room temperature.

  • UV curing can also be used on some glasses, semiconductors, optical fibers, dental fillings, inks, paper finishes, and much more.

  • UV curing can take place in a matter of seconds.


What happens

What Happens

  • UV energy can excite photons, which result in free radicals (atoms or molecules with un-paired electrons).

  • Small impurities (ppb) can act as free radical receptors, leading to degradation.


Plastic statistics

Plastic Statistics

  • One ton of recycled plastic saves:

    • 5,774 Kwh of energy

    • 16.3 barrels (685 gallons) of oil

    • 98 million Btu's of energy

    • 30 cubic yards of landfill space

  • Recycled plastic saves 88% of the energy used to produce plastic from raw materials.

  • Only 26% of HDPE plastic are recycled

  • Plastics cannot be naturally degraded.


Effect of uv light on standard plastic and bio plastic bags

  • No polyethylene is used .

  • Made from cornstarch, vegetable oil and other renewable resources.

  • The Mater-Bi process is protected by more than 70 patents.

  • Compostable, disposable


Procedure

Procedure:

  • Cut plastic bag into a strip 1” x 12”.

  • Record initial thickness using micrometer.

  • Record initial width with Verneir calipers.

  • Clamp one end of bag allowing the strip to hang.

  • Clamp the other end such that weights can be hung from the clamp.

  • Measure the initial length of the specimen.

  • Add weight in 50g increments, record the length after each increment.

  • Continue the previous step until the specimen breaks.

  • After breakage record the final length, thickness and width.


Test setup

Test Setup


The end result

The End Result


Conclusions

Conclusions

  • Just the tensile test alone was not enough to reach a solid conclusion.

  • The creep properties of the plastic appeared to be affected.

  • The stress strain curve alone cannot show the elongation for a given time period.

  • We observed the samples exposed to more UV light crept the slowest.


Sources

Sources

  • http://www.zeusinc.com/cgi-bin/search.exe?q=UV

  • http://www.masterbond.com/wbarticles/wbuv.html

  • http://en.wikipedia.org/wiki/Ultraviolet

  • http://www.biogroupusa.com/catering.htm

  • http://www.biobag.at/produkte/bio_bag/bag_4_life/

  • http://www.greenerchoices.org/products.cfm?product=plastic&pcat=homegarden

  • http://www.deq.state.ms.us/MDEQ.nsf/page/Recycling_RecyclingTrivia?OpenDocument


  • Login