Anionic living polymerization of β‐propiolactone initiated with crowned potassium methacrylate: Macromonomers and their copolymers with butyl acrylate

The polymerization of β‐propiolactone (βPL) with crowned K + counterion has been shown previously to be a living process. This behaviour was used to prepare macromonomers of poly(βPL) with the methacryloyl reactive group. Poly(βPL) is known to be a crystalline polymer; thus, copolymers of poly(βPL) macromonomers with butyl acrylate gave graft copolymers with properties stemming from this ability. Selected mechanical properties of the copolymers are close to those of acrylic rubbers reinforced with fillers.