Here, the high-strength,
high-ductility blends of poly(lactic acid)
(PLA) with epoxidized soybean oil (ESO) and 3-aminophenylboronic acid
(APBA) were successfully prepared via a melt-bending method. The effects
of APBA addition on the mechanical and thermal properties, morphologies,
and crystallization behavior of the blends were investigated. The
results showed that the addition of APBA endowed the PLA/ESO/APBA
blends with a good balance of strength and toughness. The yield strength
of the PLA/ESO/APBA (90:10:3) blend was 70 MPa, which was 25% higher
than that of the corresponding PLA/ESO blend without APBA (56 MPa),
while its elongation at break reached 160%, which is greatly superior
to that of pure PLA (6.5%). Scanning electron microscopy images showed
that the incorporation of APBA significantly improved the compatibility
between PLA and ESO, while gel permeation chromatography and rheological
analysis suggested the occurrence of complex reactions between the
three constituents, which improved the compatibility between PLA and
ESO and enhanced the mechanical properties of the blends. Hence, the
PLA/ESO/APBA blends possess great potential for application in the
manufacture of environmentally friendly degradable plastics.