Preparation of Polylactic Acid Graft Polyvinyl Acetate Compatibilizers for 50/50 Starch/PLLA Blending
Polylactic acid-g-polyvinyl acetate (PLLA-g-PVAc)
was used as a compatibilizer for 50/50 starch/PLLA blend. PLLA-g-
PVAc with different mol% of PVAc contents were prepared by
grafting PVAc onto PLLA backbone via free radical polymerization
in solution process. Various conditions such as type and the amount
of initiator, monomer concentration, polymerization time and
temperature were studied. Results showed that the highest mol% of
PVAc grafting (16 mol%) was achieved by conducting graft
copolymerization in toluene at 110°C for 10 h using DCP as an
initiator. Chemical structure of the PVAc grafted PLLA was
confirmed by 1H NMR. Blending of modified starch and PLLA in the
presence compatibilizer with different amounts and mol% PVAc was
acquired using internal mixer at 160°C for 15 min. Effects of PVAc
content and the amount of compatibilizer on mechanical properties of
polymer blend were studied. Results revealed that tensile strength and
tensile modulus of polymer blend with higher PVAc grafting content
compatibilizer showed better properties than that of lower PVAc
grafting content compatibilizer. The amount of compatibilizer was
found optimized in the range of 0.5-1.0 Wt% depending on the mol%
PVAc.
[1] M. Zuideveld, C. Gottschalk, H. Kropfinger, R. Thomann, M. Rusu, and
H. Frey, "Miscibility and properties of linear poly(L-lactide)/branched
poly(L-lactide) copolyester blends", Polymer, vol. 47, pp. 3740-3746,
2006.
[2] T. Ouchi, S. Ichimurs and Y. Ohya, "Synthesis of branched poly(lactide)
using polyglycidol and thermal mechanical properties of its solution-cast
film," Polymer, vol. 47, pp. 429-434, 2006.
[3] W. Chin-San, "Improving Polylactide/starch biocomposites by grafting
polylactide with acrylic acid-characterization and biodegradability
assessment", Macromol. Biosci., vol 5, pp. 352-361, 2005.
[4] Z. Jian-Feng and S. Xiuzhi, "Mechanical properties of poly(lactic
acid)/starch composites compatibilized by maleic anhydride",
Biomacromolecule, vol 5, pp. 1446-1451, 2004.
[1] M. Zuideveld, C. Gottschalk, H. Kropfinger, R. Thomann, M. Rusu, and
H. Frey, "Miscibility and properties of linear poly(L-lactide)/branched
poly(L-lactide) copolyester blends", Polymer, vol. 47, pp. 3740-3746,
2006.
[2] T. Ouchi, S. Ichimurs and Y. Ohya, "Synthesis of branched poly(lactide)
using polyglycidol and thermal mechanical properties of its solution-cast
film," Polymer, vol. 47, pp. 429-434, 2006.
[3] W. Chin-San, "Improving Polylactide/starch biocomposites by grafting
polylactide with acrylic acid-characterization and biodegradability
assessment", Macromol. Biosci., vol 5, pp. 352-361, 2005.
[4] Z. Jian-Feng and S. Xiuzhi, "Mechanical properties of poly(lactic
acid)/starch composites compatibilized by maleic anhydride",
Biomacromolecule, vol 5, pp. 1446-1451, 2004.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:54227", author = "S. Buchatip and A. Petchsuk", title = "Preparation of Polylactic Acid Graft Polyvinyl Acetate Compatibilizers for 50/50 Starch/PLLA Blending", abstract = "Polylactic acid-g-polyvinyl acetate (PLLA-g-PVAc)
was used as a compatibilizer for 50/50 starch/PLLA blend. PLLA-g-
PVAc with different mol% of PVAc contents were prepared by
grafting PVAc onto PLLA backbone via free radical polymerization
in solution process. Various conditions such as type and the amount
of initiator, monomer concentration, polymerization time and
temperature were studied. Results showed that the highest mol% of
PVAc grafting (16 mol%) was achieved by conducting graft
copolymerization in toluene at 110°C for 10 h using DCP as an
initiator. Chemical structure of the PVAc grafted PLLA was
confirmed by 1H NMR. Blending of modified starch and PLLA in the
presence compatibilizer with different amounts and mol% PVAc was
acquired using internal mixer at 160°C for 15 min. Effects of PVAc
content and the amount of compatibilizer on mechanical properties of
polymer blend were studied. Results revealed that tensile strength and
tensile modulus of polymer blend with higher PVAc grafting content
compatibilizer showed better properties than that of lower PVAc
grafting content compatibilizer. The amount of compatibilizer was
found optimized in the range of 0.5-1.0 Wt% depending on the mol%
PVAc.", keywords = "starch, PLLA, compatibilizer, free radical
polymerization, blending", volume = "6", number = "5", pages = "439-3", }