Abstract
The biodegradability of polylactide (PLA) and gelatinized starches (GS) blend films in the presence of compatibilizer was investigated under controlled soil burial conditions. Various contents (0–40 wt%) of corn and tapioca starches were added as fillers; whereas, different amounts of methylenediphenyl diisocyanate (MDI) (0–2.5 wt%) and 10 wt% based on PLA content of polyethylene glycol 400 (PEG400) were used as a compatibilizer and a plasticizer, respectively. The biodegradation process was followed by measuring changes in the physical appearance, weight loss, morphological studies, and tensile properties of the blend films. The results showed that the presence of small amount of MDI significantly increased the tensile properties of the blends compared with the uncompatibilized blends. This is attributed to an improvement of the interfacial interaction between PLA and GS phases, as evidenced by the morphological results. For soil burial testing, PLA/GS films with lower levels (1.25 wt%) of MDI had less degradation; in contrast, at high level of MDI, their changes of physical appearance and weight loss tended to increase. These effects are in agreement with their water absorption results. Furthermore, biodegradation rates of the films were enhanced with increasing starch contents, while mechanical performances were decreased.
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Martelli SM, Martelli EG, Martelli E (2009) J Therm Anal Calorim 97:853
Ren J, Fu H, Ren T, Yuan W (2009) Carbohydr Polym 77:576
Gu SY, Zhang K, Ren J, Zhan H (2008) Carbohydr Polym 74:79
Fortunati E, Armentano I, Iannoni A, Kenny JM (2010) Polym Degrad Stab 95:2200
Badia JD, Blasco LS, Moriana R, Greus AR (2010) Polym Degrad Stab 95:2192
Liao HT, Wu CS (2009) Mat Sci Eng A-Struct 515:207
Sarazin P, Li G, Orts WJ, Favis BD (2008) Polymer 49:599
Martin O, Averous L (2001) Polymer 42:6209
Drumright RE, Gruber PR, Henton DE (2000) Adv Mater 12:1841
Huneault MA, Li H (2007) Polymer 48:270
Li H, Huneault MA (2007) Polymer 48:6855
Zhang JF, Sun X (2004) J Appl Polym Sci 94:1697
Zhang JF, Sun XS (2004) Biomacromolecules 5:1446
Hu Y, Hu YS, Hiltner A, Baer E (2003) Polymer 44:5711
Ke T, Sun XS (2003) J Polym Environ 11:7
Wang H, Sun X, Seib P (2002) J Polym Environ 10:133
Dieteroch D, Grigat E, Hahn W (1985) Chemical and physical-chemical principles of polyurethane chemistry. In: Oertel G (ed) Polyurethane handbook. Hanser, New York
Wang H, Sun X, Seib P (2001) J Appl Polym Sci 82:1761
Wang H, Sun X, Seib P (2002) J Appl Polym Sci 84:1257
Knutson CA, Grove MJ (1994) Cereal Chem 71:469
Rizzarellia P, Puglisia C, Montaudo G (2004) Polym Degrad Stab 85:855
Schnabel W (1981) Polymer degradation, principles and practical applications. Hanser, Wien
Mitchell R, Mcnamara CJ (2010) Cultural heritage microbiology, fundamental studies in conservation science. ASM Press, Washington
Phetwarotai W, Potiyaraj P, Aht-Ong D (2010) J Appl Polym Sci 116:2305
Ratanakamnuan U, Aht-Ong D (2006) J Appl Polym Sci 100:2725
Vert M, Feijen J, Albertsson A, Scott G, Chiellini E (1992) Biodegradable polymers and plastics. The Royal Society of Chemistry, Cambridge
Fakirov S, Bhattacharyya D (2007) Handbook of engineering biopolymers, homopolymers, blends, and composites. Hanser, Munich
Ke T, Sun XZ, Seib P (2003) J Appl Polym Sci 89:3639
Phetwarotai W, Potiyaraj P, Aht-Ong D (2012) J Appl Polym Sci 126:E162–E172
Acknowledgments
The authors acknowledged the financial support from the National Research University Project of CHE and the Ratchadaphiseksomphot Endowment Fund (AM1027A) and the 90th Anniversary of Chulalongkorn University Fund (Ratchadaphiseksomphot Endowment Fund). W. Phetwarotai gratefully thanks Development and Promotion of Science and technology Talents project (DPST).
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Phetwarotai, W., Potiyaraj, P. & Aht-Ong, D. Biodegradation of Polylactide and Gelatinized Starch Blend Films Under Controlled Soil Burial Conditions. J Polym Environ 21, 95–107 (2013). https://doi.org/10.1007/s10924-012-0530-6
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DOI: https://doi.org/10.1007/s10924-012-0530-6