Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/S0104-14282009000400011
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Evaluation of Photodegradation in LDPE/modified Starch Blends

Vinhas, Glória M.; Almeida, Yêda M. B.; Lima, Maria A. G. A.; Ferreira, Flávia G. D.

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Abstract

Photodegradation of LDPE/modified starch blends 80/20 m/m has been examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X ray diffraction (DRX) before and after exposure to ultraviolet radiation (UV). Samples were exposed to UV in the laboratory for periods of 6, 24, 48 and 60 hours. The main alteration in the polymeric material after exposure to the radiation was a decrease in the mechanical properties, tensile strength and elongation. There were also changes in the chemical structure of the blend with an increase in the carbonyl and vinyl indices, 65.58 and 53.29%, respectively. The analysis of the blend crystallinity pointed to the formation of a new crystalline symmetry that did not exist before the irradiation.

Keywords

Photodegradation, polymer blends, polyethylene, starch.

References

1. Oldak, D.; Kaczmarek, H.; Buffeteau, T. & Sourisseau, C. - J. Mater. Sci., 40, p.4189 (2005).

2. Kaczmarek, H. & Oldak, D. - Polym. Degrad. Stab., 91, p.2282 (2006).

3. Arvanitoyannis, I.; Biliadois, C. G.; Ogawa, H. & Kawasaki, N. - Carbohydr. Polym., 36, p.89 (1998).

4. EL-Rahim, H. A. A.; Hegazy, E. S. A.; Ali, A. M. & Robic, A. M. - J. Photochem. Photobiol. A, 163, p.547 (2004).

5. Cascone, M. G.; Barbani, N.; Cristalini, C.; Ginsfi, P.; Ciardelli, G. & Lazzari, L. - J. Biomater. Sci. Polym., 12, p.267 (2001).

6. Zhai, M.; Yoshii, F.; Kume, T. & Hashim, K. - Carbohydr. Polym., 50, p.295 (2002).

7. Arvanitoyannis, I. S. - J. Macromol. Sci. Part C: Rev. Macromol. Chem. and Physics, C39, p.205 (1999).

8. Graaf, R. A.; Janssen, L. P. B. M. - Polym. Eng. Sci., 34, p.2 (2000).

9. Graaf, R. A.; Janssen, L. B. P. M. - Polym. Eng. Sci., 41, p.3 (2001).

10. Kaplan, D. L. - “Biopolymers from renewable resources”. Springer, Berlin (1998).

11. Andrady, A. L.; Hamid, S. H.; Hu, X. & Torikai, A. - J. Photochem. Photobiol. B, 46, p.96 (1998).

12. Tse, K. C. C.; Ng, F. M. F. & Yu, K. N. - Polym. Degrad. Stab., 91, p.2380 (2006).

13. Carlsson, D. J. & Wiles, D. M. - J. Macromol. Sci., Part C: Rev. Macromol. Chem. and Physics C14, p.65 (1976).

14. Fechine, G. J. M.; Rabello, M. S. & Souto-Maior, R. M. - Polym. Degrad. Stab., 75, p.153 (2002).

15. Lima, S. M. - “Estudo da Capacidade Biodegradadora de Culturas Mistas de Fungos em Blendas Poliméricas Biodegradáveis”, Msc. Dissertation, Federal University of Pernambuco, Brazil (2005).

16. Rabello, M. S. & White, J. R. - Plast. Rubber Compos. Process. Appl., 25, p.237 (1996).

17. American Society for Testing and Materials - ASTM – “Test Method for Tensile Properties of Plastics” (Test Method D638-03), Annual Book of ASTM Standards, West Conshohocken, Pennsylvania (2003).

18. Sousa, A. R.; Amorin, K. L. E.; Medeiros, E. S.; Melo, T. J. A. & Rabello, M. S. - Polym. Degrad. Stab., 91, p.1504 (2006).

19. Coelho, N. S.; Almeida, Y. M. B. & Vinhas, G. M. - Polímeros – Cienc. Tecnol., 18, p.270 (2008).

20. Canevarolo Jr, S. V. - “Técnicas de Caracterização de Polímeros”, Artliber Editora Ltda, São Paulo (2003).

21. Luo, S. & Netravali, N. - J. Appl. Sc., 73, p.1059 (1999).

22. Sánchez-Solís, A. & Estrada, M. R. - Polym. Degrad. Stab., 52, p.305 (1996).
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