In this work, we described a facileapproach to preparing polypropylene (PP) surface functionalizedwith telechelic poly(lactic-co-glycolic acid) (HOPLGA-COOH). The PP flakes were first treated with oxygenplasma and then grafted with different molecular
weight PLGA (Mw ? 50, 100, and 300 K) in dry dichloromethanesolution with the addition of phosphorus pentachloride(PCl5). The attenuated total reflectance-Fourier
transform infrared (ATR–FTIR) spectroscopy measurementswere used to characterize the composition of the PPsurface. The appearance of 1756 cm1 for carbonyl (C?O)
stretching and 1090 cm1 for CAOAC and the morphologiesobservations by atomic force microscopy show thatPLGA graft covered the surface of PP flake. The IR intensityat 1756 cm-1 increases with the decreasing Mw ofPLGA, and the molecular weight of PLGA also influencethe grafting of PLGA on PP. The contact angle was usedto monitor the changes in hydrophilicity of PP flake surfacealong the treatment procedure. PLGA-grafted PP (PPg-PLGA) was eventually obtained.
