Actas de congresos
Mechanical And Thermal Properties Of Poly(3-hydroxybutyrate) Blends With Starch And Starch Derivatives
Registro en:
Macromolecular Symposia. , v. 197, n. , p. 77 - 87, 2003.
10221360
10.1002/masy.200350708
2-s2.0-0141761281
Autor
Innocentini-Mei L.H.
Bartoli J.R.
Baltieri R.C.
Institución
Resumen
Poly(3-hydroxybutyrate) (PHB) is a highly crystalline, biodegradable and biocompatible thermoplastic. However, its limited utilization as a commodity plastic is associated to both high cost and very poor mechanical properties. Blending PHB with a natural polymer, such as starch, is one way to improve its properties and to get low price raw materials, though they are not miscible since there are no strong interactions between the hydrophilic starch and the hydrophobic PHB. In this study binary blends of PHB were prepared with natural starch, starch-adipate and grafted starch-urethane derivatives. The PHB blends were characterized in terms of their mechanical and thermal properties. For all blends a decrease of the Young modulus was observed as compared to the pure PHB. However, blends containing natural starches and starch adipate resulted in brittle materials. A significant decrease of both glass transition temperature (Tg) and melting point (Tm) was observed for all formulations. The best results, lower modulus and Tg were obtained with grafted starch-urethane blends using poly(propylene glycol). 197
77 87 Lee, B., Pometto A.L. III, Fratzke, A., Bailey, T.B., Biodegradation of degradable plastic polyethylene by Phanerochaele and Streptomyces species (1991) Appl. Environ. Microbiol., 57, pp. 678-685 Steinbuchel, A., Polyhydroxyalkanoic acids (1991) Biomaterials: Novel Materials from Biological Sources, pp. 124-213. , D. Byrom (ed.). Stockton, New York Doi, Y., (1990) Microbial Polyesters, , VCH, New York Byrom, D., Polyhydroxyalkanoates (1994) Plastics from Microbes: Microbial Synthesis of Polymers and Polymer Precursors, pp. 5-33. , D.P. Mobley(ed.). Hanser Munich Saennkora, L., Gercberga, Z., Nikolaeva, V., Dzene, A., Bibers, I., Kalnin, M., Mechanical properties and biodegradation characteristics of PHB-based films (2000) Process Biochemistry, 35, pp. 573-579 Ikejima, T., Inoue, Y., Crystallization behavior and environmental biodegradability of the blends films of poly(3-hydroxybutyric acid) with chitin and chitosan (2000) Carbohydrate Polymers, 41, pp. 351-356 Mani, R., Bhattacharya, M., Properties of injection moulded starch/synthetic polymer blends-III. Effect of amylopectin to amylose ratio in starch (1998) Europen Polymer Journal, 34 (10), pp. 1467-1475 Graaf, R.A., Broekroelofs, A., Janssen, L.P.B.M., The acetylation of starch by reactive extrusion (1998) Starch, 50 (5), pp. 198-205 Verhoogt, H., Stpierre, N., Truchon, F.S., Ramsay, B.A., Favis, B.D., Ramsay, J.A., Blends containing poly(hydroxybutyrate-co-12-percent-hydroxyvalerate) and thermoplastic starch (1995) Canadian Journal of Microbiology, 41 (1), pp. 323-328 Dubois, P., Krishnan, M., Narayan, R., Aliphatic polyester-grafted starch - Like polysaccharides by ring-opening polymerization (1999) Polymer, 40, pp. 3091-3100 Mani, R., Bhattacharya, M., Properties of injection moulded starch/synthetic polymer blends- IV. Thermal and morphological properties (1998) Europen Polymer Journal, 34 (10), pp. 1477-1487 Almeida, G.S.G., (2001), Master Thesis "Estudo e Desenvolvimento de Compósitos Parcialmente Degradáveis de Polietileno de Baixa Densidade (PEBD) com Amido", Chemical Engineering School, State University of Campinas, JulySaad, R.G., Mansour, A.A., Hamed, A.H., Dieletric investigation of cold crystallization of poly(3-hydroxybutyrate) (1997) Polymer, 16 (38), pp. 4091-4096 Yoshie, N., Nakato, K., Fujiwara, M., Kasuya, K., Abe, H., Doi, Y., Inoue, Y., Effect of low molecular weight additives on enzymatic degradation of poly(3-hydroxybutyrate) (2000) Polymer, 41, pp. 3227-3234