DEVELOPMENT OF POLY(D,L-LACTIC ACID) WITH POLYBENZOXAZINE VIA SOLUTION BLENDING

Abstract

Polybenzoxazine was synthesized by using bisphenol A, formaldehyde and diamine as precursor
via condensation reaction. Triethylenetetramine was used as diamine precursor. Polybenzoxazine was
characterized by FTIR technique in order to confirm the obtained polybenzoxazine. The ratio of poly(D,Llactic acid)/polybenzoxazine (Mw = 10,000 and 20,000 g/mol) was 0:100, 1:99, 3:97 and 5:95, respectively.
The poly(D,L-lactic acid)/polybenzoxazine films were characterized by using Scanning Electron Microscope
(SEM). The results showed homogenous and smooth films. Thermal stability of poly(D,L-lactic
acid)/polybenzoxazine films was better than pure polybenzoxazine film. Moreover, 3:97 ratio of
polybenzoxazine mixed with poly(D,L-lactic acid) (Mw = 20,000 g/mol) film showed good tensile
strength,because the stress at break was 24.06 ± 7.99 when determined by Universal Tenting Machine. It was
concluded that poly(D,L-lactic acid) improved the property of the polybenzoxazine film.