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Physical Characterization of Coupled Poly(lactic acid)/Starch/Maleic Anhydride Blends Plasticized by Acetyl Triethyl Citrate
Author(s) -
Zhang JianFeng,
Sun Xiuzhi
Publication year - 2004
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200400076
Subject(s) - maleic anhydride , lactic acid , starch , polymer chemistry , chemistry , characterization (materials science) , organic chemistry , copolymer , materials science , polymer , nanotechnology , bacteria , biology , genetics
Summary: Acetyl triethyl citrate (ATC) was used as a plasticizer for poly(lactic acid) (PLA)/starch blends coupled with maleic anhydride and an initiator of 2,5‐bis( tert ‐butylperoxy)‐2,5‐dimethylhexane (L101). Elongation of the blend at break was markedly increased when the ATC content was above the 8% loading level, which is referred to as the percolation threshold. The extended elongation was achieved at the expense of tensile strength and elastic modulus. Thermal transitions of the blend, including the glass transition temperature ( T g ), cold crystallization temperature ( T c ) and melting temperature ( T m ), decreased with ATC content. Thermally induced ATC migration affected the thermal behavior of the plasticized blends and reduced elongation and tensile strength, whereas the elasticity modulus increased. ATC migration increased with ambient temperature, which was controlled by the activation energy of the blend system. Leaching of ATC was slow at room temperature in distilled water, but significant in boiling water. Additionally, the leaching rate was also directly proportional to the ATC content of the blend.Glass transition temperatures of PLA/starch/MA/L101 blends with various acetryl triethyl citrate contents.