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Study the Effect of Nano Particles on Biodegradability of Starch Biopolymers

Ostadi, Hadi | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45518 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Vossoughi, Manoochehr; Alemzadeh, Iran
  7. Abstract:
  8. Nowadays, Food generation has gained great importance, not only in economic view but also in political. Food reservation is as important as food generation. Synthetic polymer films has widespread use in packaging industries, that is because of its features like easily forming, low price, lightness, etc. The increase of oil resources prices and severe environmental pollution by synthetic polymers, are notable cases which led researchers to find ways in using bio polymers. Starch is one of the bio polymers which is cheap and totally degradable. Using starch in bio degradable leads to high decrease in the mix features. Nano particles are used to solve the problem.
    In this study, the effect of glycerol and Na-MMT on bio degradation of corn starch is considered. Films are prepared by casting method and bio degradation is examined through samples burial in two kind of soils. One of the soil samples is reinforced with nutrients which was the result of a starch decompositioning soil microorganism. For more comprehensive consideration, nano particles and glycerol was used in three levels based on face center composite. The results were considered through surface response. It was observed that biodegradation in soil with nutrients is less, and most buried samples are degraded in 6 months. Na-MMT effect in biodegradation decrease is more than glycerol effect in samples biodegradation increase. In all glycerol levels, with nano clay increase up to 5 percent, tensile strength increases. Also in samples with nano particles, increasing glycerol from 10 to 20 percent, tensile strength increases and with its increase from 20 to 30 percent, tensile strength decreases. Glycerol effect in contact angle decrease, is little more than nano clay effect in contact angle increase. Formulation effect was considered through XRD-VISU tests. FT-IR spectrum was considered to study bio polymer degradation. It was observed that weight decrease and degradation was because of glycerol leaching and alpha 1 ,4 degradation. SEM photos were used to surface morphology and polymer degradation study. Response surface graphs, perturbation graphs, linear and nonlinear forms of response surfaces based on coded amounts of glycerol and nano clay, were used in the study.
  9. Keywords:
  10. Tensile Strength ; Biopolymer ; Solution Mixing ; Nanocomposite ; Biodegradation ; Polymer Degradation

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