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The first approach relies upon a two\u2010step procedure using a REx\u2010polymerized poly(ethylene glycol) methyl ether acrylate, i.e., poly(AcrylPEG), as a highly\u2010branched and compatible impact modifier for PLA. The free\u2010radical polymerization proves to be very efficient with a peroxide initiator concentration of 1 wt%. The as\u2010produced poly(AcrylPEG) is then melt\u2010blended with PLA by extrusion. The resulting materials exhibit largely increase impact resistance (ca. 35 kJ\/m<jats:sup>2<\/jats:sup>) in presence of 20 wt% poly(AcrylPEG) in comparison with neat PLA (2.7 kJ\/m<jats:sup>2<\/jats:sup>), while moderate ductility (tensile elongation at break &lt;40%) and limited plasticization effect are observed. The second \u201cone\u2010step\u201d approach consists in in situ grafting of AcrylPEG onto PLA backbone via a one\u2010stage REx. The resulting materials exhibit substantially improved impact resistance (ca. 102 kJ\/m<jats:sup>2<\/jats:sup>) for AcrylPEG loading of 20 wt%, high ductility (tensile elongation at break of ca. 150%) and efficient plasticization. A detailed characterization of the morphology of the materials has been performed using PF\u2010QNM\u2010AFM to better elucidate the structure\u2010property relationships.  POLYM. ENG. 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